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Urban Forestry in India: Development and Research Scenario

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  • Indian Institute of Forest Management, Bhopal, India

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Urban green spaces are integral components of urban ecosystems, contributing to enhanced environmental quality, quality of life and sustainable urban development. Scientific evidences in last two decades have emphasized the crucial necessity of green areas within urban social-ecological systems to ameliorate several problems of city-culture. Role of parks and gardens has become much more important in view of ever increasing population of cities, particularly in developing countries. Tangible and intangible benefits provided by these green assets are often taken for granted by the public and some city authorities. Like other developing economies, India is being urbanized at a faster pace. Generally, cities of developing countries have lower per capita availability of urban green spaces in comparison to the developed countries. Urban forestry studies, involving technical and social science aspects are lacking in developing countries, including India. Per capita availability of urban green spaces in some important cities of India and need for urban forestry research on various aspects of urban greens of the country is discussed in the article
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80 Interdisciplinary Environmental Review, Vol. 12, No. 1, 2011
Copyright © 2011 Inderscience Enterprises Ltd.
Urban forestry in India: development and research
scenario
Pradeep Chaudhry*
State Forest Research Institute,
Chimpu, Itanagar 791111, Arunachal Pradesh, India
E-mail: pradeepifs@yahoo.com
*Corresponding author
Vindhya P. Tewari
Institute of Wood Science and Technology,
18th Cross, Malleswaram, Bangalore 560003, India
E-mail: vptewari@yahoo.com
Abstract: Urban green spaces are integral components of urban ecosystems,
contributing to enhanced environmental quality, quality of life and sustainable
urban development. Scientific evidences in the last two decades have
emphasised the crucial necessity of green areas within urban social-ecological
systems to ameliorate several problems of city-culture. Role of parks and
gardens has become much more important in view of ever-increasing
population of cities, particularly in developing countries. Tangible and
intangible benefits provided by these green assets are often taken for granted by
the public and some city authorities. Like other developing economies, India is
being urbanised at a faster pace. Generally, cities of developing countries have
lower per capita availability of urban green spaces in comparison to the
developed countries. Urban forestry studies, involving technical and social
science aspects are lacking in developing countries, including India. Per capita
availability of urban green spaces in some important cities of India and need for
urban forestry research on various aspects of urban greens of the country is
discussed in the article.
Keywords: urban greenery; public parks; gardens; intangible benefits;
ecosystem services; developing countries; environmental quality; Chandigarh;
Gandhinagar; Bangalore; Delhi; India.
Reference to this paper should be made as follows: Chaudhry, P. and
Tewari, V.P. (2011) ‘Urban forestry in India: development and research
scenario’, Interdisciplinary Environmental Review, Vol. 12, No. 1, pp.80–93.
Biographical notes: Pradeep Chaudhry is a Senior Forest Officer in the Indian
Forest Service having work experience in different forest types of India located
in the states and union-territories of Andaman and Nicobar Islands,
Arunachal Pradesh, Himachal Pradesh, Rajasthan and Chandigarh. He has
multidisciplinary interests and capabilities as reflected through his publications
in various international peer reviewed journals related to different fields. He
has special interest in environmental and forestry issues especially their
economic and valuation aspects.
Urban forestry in India 81
Vindhya P. Tewari is a Senior Scientist, currently working at the Institute of
Wood Science and Technology, Bangalore, India. He has worked at the
Institute of Forest Management and Yield Sciences, University of Goettingen,
Germany in the capacity of FAO Fellow and as a DAAD Fellow. His main
research fields include growth and yield modelling, forest management and
silvicultural aspects of tropical tree species. He has two edited books and more
than 50 research papers to his credit in various reputed national and
international scientific journals.
1 Introduction
The world is fast becoming an urban place as nearly two third of the world’s population
is expected to live in urban areas by 2025 (Schell and Ulijaszek, 1999). In developed
countries, the majority of the population is living currently in cities, e.g., more than 80%
of USA (Wolf, 1998) and 85% of the Australian population are living in and around
urban cities (Brack, 2002). Due to this urbanisation trend, distance between city
inhabitants and nature is increasing. Urban greenery/forestry is one of the ways to bridge
this gap between people and nature. Urban forests or urban green spaces are one of those
green infrastructures, which are more known for their non-priced benefits (like pollution
control, energy conservation, leisure/recreation, carbon sequestration, etc.) than priced
benefits in urban settings. Urban green spaces or parks/gardens contribute to an improved
quality of urban life in many ways, even though these functions are often taken for
granted by the public and city authorities, mostly in developing countries.
2 Benefits of urban forestry
Broadly speaking, urban forestry is the art, science and technology of managing trees and
forest resources in and around urban community ecosystems for physiological,
sociological, economic and aesthetic benefits trees provide for society (Miller, 1997).
Urban parks, gardens and natural landscapes provide several non-market or intangible
benefits for urban population. A literature survey reveals an earliest research paper
containing details of various experimental studies related to functions and impacts of
urban planted areas, effect of plants on climatic characteristics of a city, climatic impacts
of private planted areas around buildings, impact of green spaces on air pollution and
social functions of urban parks/gardens (Givoni, 1991). Subsequently, researchers have
described various studies conducted in the USA about the influence of urban trees and
forests on the physical and biological environment in quantitative terms (Dwyer et al.,
1992). Later on research on these aspects of multiple functions and benefits of urban
vegetation continued to grow in North America and Europe (Petit et al., 1995) and was
expressed in tangible monetary terms (Price, 2003; Nowak and Dwyer, 2000). Urban
green spaces play an important part in offering town-dwellers a more stress free
environment, irrespective of sex, age or socio-economic background (Grahn and
Stigsdotter, 2003). People are eager to access the green spaces for recreation and to
experience nature (de Groot and van den Born, 2003; Lynn and Brown, 2003).
82 P. Chaudhry and V.P. Tewari
A healthy, well managed urban forest system can provide many other benefits. For
example, it can sequester carbon dioxide emissions and produce oxygen (Jo, 2002;
Johnson and Gerhold, 2003; McPherson et al., 2005); reduce noise pollution in cities
(Fang and Ling, 2005; Bolund and Hunhammar, 1999); reduce storm water runoff (Xiao
et al., 1998); alleviate the intensity of heat island and help creating an oasis effect
(Potchter et al., 2008; Shashua-Bar et al., 2009); reduce air pollution (Nowak, 1994;
McPherson and Simpson, 1998; Jim and Wendy, 2009) and help maintain biodiversity
(Attwell, 2000). In addition to the above, proximity of public parks/gardens, natural
areas, golf courses and tree avenues can have a significant effect on the sale price of
houses (Luttik, 2000; Bolitzer and Netusil, 2000). Research in European cities has
established that green spaces provide better environment for commercial and residential
purposes (Konijnendijk, 1999, 2001).
3 Per capita availability of urban forests: some estimates
In India from ancient times, flowers and plants have been admired and cultivated. There
are many references to the Gardens in old Buddhist literature and the Sanskrit plays. But
it was from the North, Central Asia and Persia that the splendid garden traditions were
introduced in India, taking roots under various Muslim conquerors. A few surviving
Mughal gardens, at present, are found in Srinagar, Pinjore, Delhi, Agra and Allahabad
cities. Special care has been taken to include urban forestry in the city’s master plans in
respect of newly developed cities after Indian independence, e.g., Gandinagar and
Chandigarh. Gandhinagar, the capital city of Gujarat state, leads in per capita urban
greenery (Figure 1) among Indian cities with Chandigarh taking second and Bangalore
last position (based on 2001 population census). A casual drive through Gandhinagar city
roads reveals that the variety of tree species planted on roadsides, parks/gardens/vans and
as block plantation, is less in comparison to other important Indian cities. Azadirachta
indica and Peltophorum species mainly dominate the Gandhinagar city area. Bangalore
city has scored high in terms of ‘species richness’ with the recording of 164 species in
parks, institutions, commercial and residential areas (Sudha and Ravindranath, 2000)
while Chandigarh stood second with over 100 kinds of tree species along roads, parks,
gardens and residential areas, excluding species in botanical gardens (Kohli et al., 2000).
Vegetation in Delhi consists mainly of tropical thorn forest with Prosopis juliflora being
dominant. This is a controversial species in the city forests/reserved forests from the
wildlife, mainly birds and aesthetic view point (Khera et al., 2009). However, the city has
some well maintained parks and gardens like Lodhi Garden, Mughal Garden, Deer Park,
Budha Jayanti Samarak Park, Indraprashtha Park and The Garden of Five Senses.
Overall, there are about 15,000 big and small parks/gardens in Delhi, maintained by
different agencies. The forest department of NCT, Delhi and other governmental agencies
has been responsible for increasing the green cover of the city from 30 sq kms to 300 sq
kms during last ten years, despite of acute biotic pressure (Figure 2).
Urban forestry in India 83
Figure 1 Green space per capita availability in some Indian cities (see online version for colours)
84 P. Chaudhry and V.P. Tewari
Figure 2 Change in forest and tree cover in Delhi (see online version for colours)
Urban forestry in India 85
From the global perspective, although there are wide variations both in coverage as well
as per capita availability of green spaces, cities renowned for their urban green spaces
often have 20% to 35% coverage of total geographical area and 25 to 100 m
2
urban green
space per capita. Most of the Indian cities, with the exceptions of Ganhinagar and
Chandigarh, are far behind in per capita urban forest availability in comparison to
European/Australian/US cities (Table 1). The quality of green spaces is also a
questionable issue in India. Freely roaming cattle in cities, garbage heaps in and around
green spaces and poor civic sense of the majority of the population seems to be among
the prominent reasons. However, what is needed most is not only the education of
individuals, but especially the education of municipalities regarding their duty relating to
public hygiene. Public hygiene includes solid waste disposal, basic sewage facilities,
drinking water purification and exhaust fume control in auto-taxis and public buses. A
‘carrot and stick policy’ for municipalities from local administration may help in this
direction.
Table 1 Estimates on urban green spaces/woodland cover in different regions
Region/country/city Estimated size of urban green space/woodland resource
Europe Average woodland cover of 18.5% within municipal limits of 26 large
European cities (104 m
2
/ inhabitant) (Konijnendijk, 2001, 2003)
France/Paris About 80 m
2
of urban forest per inhabitant in Greater Paris region
(Moigneu, 2001; Konijnendijk, 2003)
Great Britain Green areas cover about 14% of urban areas with 120,000 ha of
parks/gardens space (DLTR, 2002; Konijnendijk, 2003)
The Netherlands Average green space cover is about 19 % for 22 largest Dutch cities
(about 228 m
2
/inhabitant) (CBS, 1998; Konijnendijk, 2003)
Australia/Canberra Estimated crown cover of about 24 million metre square
(about 80 m
2
/inhabitant) (Brack, 2002)
India/Delhi Average tree and forest cover is about 20% of geographical area
(about 21.43 m
2
/inhabitant) (FSI, 2009)
India/Chandigarh Average tree and forest cover is about 35.7 % of geographical area
(about 56 m
2
/inhabitant) (Action Plan, 2009–2010)
India/Gandhinagar Tree and forest cover of the city is 3,256 ha (about 164 m
2
/inhabitant)
(FDG, 2008)
India/Bangalore Estimated crown cover of city is about 19.9% of geographical area
(about 16.8 m
2
/inhabitant) (Behera et al., 1985)
4 Urban greening: field examples from some Indian cities
The people in urban cities need areas resembling nature so as to have a break from their
busy, tiring, often monotonous and dreary routine. It is not possible for lower and middle
class families to go to hill stations and distant National parks frequently for enjoying
nature, hence it is the duty of local administration to bring a part of nature closer to city
residents. This can be achieved by developing parks and gardens in and around urban
cities.
New Delhi, the capital city of India, has grown to be one of the greenest capitals in
the world due to the consistent emphasis to grow more trees and strict monitoring of tree
86 P. Chaudhry and V.P. Tewari
cutting permissions. This has been possible despite the infrastructure projects which came
up due to the demands of the Commonwealth Games 2010. At present 20% of Delhi’s
geographical area is under green cover, making per capita green space availability to
around 21.43 m
2
. Municipal Corporation of Delhi (MCD) maintains nearly 14000 parks,
New Delhi Municipal Council (NDMC) has about 1,000 parks and gardens and Delhi
Development Authority (DDA) has many parks, city forests, biodiversity parks and other
green belts. Recently, the parks and garden society has been set up to coordinate the
greening activities in Delhi. There are nine city forests and two biodiversity parks in
Delhi. Nine more city forests are planned to be created. Still there is a need to identify
vacant areas which can be put under the green cover. Entire ridge area (about 6,000 ha)
needs to be greened. This is essential as more and more people are coming to Delhi for
employment, education and residence purposes.
To promote tree planting in urban areas, Gujarat state of India has initiated a
unique project of associating tree planting with religious practices of various
religions. According to Puranas (religious literature of Hindus), each Grah (planet),
Nakshtra (constellation) and Rashi (zodiacs) has its own favourite tree. Plantation
and protection of such trees provides positive effect and power on human life. Punit
Van (urban forest) covering six ha of land in Gandhinagar city covers all these
aspects and is a pious place for spreading message of love for trees. Total area of the
Gandhnagar capital project is 57 km
2
. By the year 2005, tree cover of the city was
57.13% of the total geographical area amounting to 32.56 km
2
. Population of the city was
around 0.2 million in 2001, resulting in per capita green space availability to more than
160 m
2
per person. Remote sensing satellite imageries were utilised by state government
for assessing changes in tree cover of the city during 1979, 1986, 1999 and 2005 (FDG,
2008). On similar concept of trees vs. religion, few more urban forests (Vans) have been
created in other cities of Gujarat state, e.g., Kailash Van near Ahmedabad city, Mangalya
Van of Ambaji city, Tirthankar Van in Mehsana district, Harihar Van of Somnath, Bhakti
Van in Chotila of Surendranagar district and Shamal Van at Shamlaji of Sabarkantha
district.
Bangalore city of India is known as the Garden City of India due to the large number
of parks and private gardens, roadside and avenue trees and the magnificent Lalbagh and
Cubbon park. The city has 705 parks spread across the city in the form of small and
medium sized parks as well as large parks. Besides these regular parks, there are around
200 open spaces and green areas, which are waiting to be developed as parks and are
without any kind of infrastructure. These are basically community amenity sites
earmarked for development of community infrastructure such as parks and gardens
(Gowda et al., 2007). Authors have given few concrete suggestions to rejuvenate urban
greens of the city, development of more regional parks of big size like that of Cubbon
park and Lal Bagh, utilising services of NGOs and multinational companies in
developing and maintaining parks and efficient use of rain water harvesting techniques.
Majority of avenue species in Bangalore city is exotic, largely planted for their high
growth rate and decorative appearance. There is need to plant trees that provide multiple
benefits, particularly in house compounds for providing edible pods, flowers, fruits,
leaves, etc., like Mangifera indica, Murraya koenigii, Moringa oleifera, Tamarindus
indica, Artocarpus integrifolia, Phyllanthus embelica and Syzygium cumini (Sudha and
Ravindranath, 2000). There is also a strong need for removal of encroachments in some
of the parks and gardens. Generally, such encroachers are politically powerful and are
bereft of environmental concerns. Estimated crown cover of the city is about 19.9% of
Urban forestry in India 87
the geographical area (Behera et al., 1985; Sudha and Ravindranath, 2000). This amounts
to per capita green space availability to around 17 m
2
.
Chandigarh city, also known as ‘city beautiful’ was the result of the partitioning of
India when the country became independent in 1947. It was built as a replacement of
Lahore city, the capital of undivided Punjab which went to Pakistan during 1947. The
construction of the city began in 1952 and was formally inaugurated by the first President
of India, Dr. Rajendra Prasad on October 7, 1953. The city has more than 35% of its
geographical area under forest and tree cover, making it one of the greenest cities of India
(Action Plan, 2009–2010). Population of the city was 0.9 million in 2001, making per
capita availability of green space around 55 m
2
. The city has more than 2000 big and
small parks and gardens, besides two reserved forests and a wild life sanctuary. Important
parks/gardens are Rose Garden, Bougainvillea Garden, Garden of Fragrance, Shanti
Kunj, Hibiscus Garden, Botanical Garden and Leisure Valley. Annual ‘festival of
gardens’ is being organised every year in the month of February by tourism department
of the local administration to promote garden tourism.
5 Indian scenario in urban forestry research
A literature survey in ‘Scopus’ (http://www.scopus.com) and ‘Google Scholar’
(http://scholar.google.co.in) research databases reveals only a few research studies on
urban forestry/green spaces in India worth mentioning. These cover a narrow spectrum of
use value estimation, species richness, birds in urban green spaces/biodiversity, carbon
sequestration and a study about the Delhi ridge plantation. Though Gandhinagar city tops
in per capita availability of urban greenery in India, to our knowledge no urban forestry
study on any aspect has been reported in research journals for this city. Four important
studies have been reported for Bangalore and two relating to Delhi’s urban biodiversity.
Beneficial impacts of green areas of Bangalore on the city’s microclimate and need for a
serious rejuvenation as a centre of social activity has been stressed in a recent study by
Gowda et al. (2007). Species richness in different areas of Bangalore city has been
studied in another study, where the density and basal area in some categories of lands
such as parks, lake surroundings and institutions was found to be quite high. Authors
have argued in favour of more research for better understanding of the city forest and
stressed for planting of tree species providing multiple benefits, including carbon
sequestration (Sudha and Ravindranath, 2000). Nagendra and Gopal (2010) found the
density of street trees in Bangalore city lower than many other Asian cities, but species
diversity was quite high. SECON private limited, a Bangalore-based multidisciplinary
firm, attempted to quantify removal of particulate matter (PM) by trees at four different
locations in Bangalore city. A study found that trees were very effective in removal of
PM in the range of 10–100 micro meters, but types of tree species which are useful in
filtering removing more PM have not been mentioned. For removal of SO
2
and NO
X
pollution, more in-depth studies have been recommended (SECON, 2006). Diversity and
density of birds and woody species in urban green spaces of Delhi was evaluated in a
study jointly conducted by TERI University of New Delhi and the Department of
Environment, Government of NCT of Delhi. A total of 56 bird species was recorded in
19 sampled green spaces. The results exhibited a negative relationship between the
density of exotic woody species especially Prosopis juliflora, the most abundant woody
species in the study area and bird species diversity. Authors recommended giving
88 P. Chaudhry and V.P. Tewari
preference to native species in the management plan of the urban green spaces in place of
the exotics (Khera et al., 2009). Historical reasons and the importance of greening Delhi
ridge following the principles of English landscape gardening have been mentioned in a
review article (Mann and Sehrawat, 2009). No significant scientific findings are available
in this particular article.
Tree planting and landscaping has been an integral part of the city’s master plan.
Researchers and academicians from Punjab University, Chandigarh had undertaken some
earlier studies involving trees of the city. By the year 2000, the city was having around
100 tree species, of which 66 were avenue trees planted along roadsides, 11 were forest
trees/shrubs and remainder were trees grown on the premises of city residences (Kohli
et al., 2000). The city is also characterised by the presence of 11 gardens covering a total
area of about 400 acres and having nearly 240 types of trees (Kohli et al., 1994). Roads of
the city are mostly identified with the type of tree species, e.g., Vigyan path with Toona
ciliata, Udyog path with Swietenia mahagoni, Dakshin Marg with Terminalia arjuna. A
study was conducted during 2002–2003, mainly to assess recreational benefits (use value)
of Chandigarh city’s urban greenery from the point of view of residents and domestic
tourists using the ‘contingent valuation method’ (CVM) and ‘travel cost method’ (TCM).
The annual recreational use value of the city’s parks/gardens, boulevards, green avenues,
reserved forests and wild life sanctuary was estimated around Rs 120 million on the
2002–2003 price level (Chaudhry, 2006). The mean willingness to pay (WTP) for the
betterment of existing green landscape features of the city and for creating new
parks/gardens on the part of each reasonably earning family residing in the city was
estimated around Rs 153/-per family per year. A comparison between WTP and WTA
(willingness to accept compensation) scenario to assign a reasonable monetary value to
the recreational aspect of environmental amenities like public parks and gardens has been
presented in a study by Chaudhry et al. (2008). Reasons for careful selection of economic
valuation methods, e.g., TCM and CVM, in the context of developing countries, have
been mentioned by the researchers (Chaudhry and Tewari, 2006; Chaudhry et al., 2007).
In respect of Kerwa Forest Area (KFA) of Bhopal city of Madhya Pradesh state,
ecosystem services like biodiversity conservation and carbon sequestration have been
quantified. Authors have pleaded for designating KFA as forestland from its present
status of revenue land so as to provide adequate protection and providing essential
forestry expertise for its reforestation and sustainable management (Dwivedi et al., 2009).
6 Potential for improvement
Urban forests and green spaces are in the public eye. All kinds of tree-related events,
such as planting or felling, removing dangerous branches are often discussed in public
and reported by the media. For these and other reasons, urban forestry should be based on
scientifically sound principles and be transparent to the public. These objectives can be
met if options are compared and evaluated, if management is demonstrated to the media,
and if management activities are continuously monitored on a short and long-term basis
(Gadow, 2002). Developed countries are doing excellently on this front but the same is
not true in case of developing countries like India. There is a lack of a comprehensive
research database on urban forestry in the country. Reasons for this deficiency are not
difficult to find. There is inadequate financial support for urban forestry development and
Urban forestry in India 89
research work. Researchers and practitioners in this field have not been able to convince
bureaucracy-laden research funding agencies on the multiple contribution of urban
forestry to human society in a populous and developing country like India. To compete
with other kind of city expenditures/budgets, it is essential for urban forestry to raise its
public profile and publicise its multiple contributions to city dwellers at large. Another
reason is the paucity of trained and skilled researchers/scientists on different aspects of
urban forestry. Researchers are using different models/software to study comprehensive
range of ecosystem services provided by urban greenery including evapo-transpiration
cooling and microclimate amelioration, carbon dioxide sequestration and oxygen
generation, removal of gaseous and particulate pollutants and integrated assessment of
environmental benefits using CITY green software (Zhang et al., 2006; Peng et al., 2007),
urban forest effects model (UFORE) and decision support system (DISMUT) in Europe,
North America, Australia and even in a developing country like China (Nowak and
Crane, 1998; Brack, 2002). But in India these kinds of studies have not been carried out
so far. During the last fifteen years, India’s neighbour China has set an excellent example
in this field. A latest review article describes the various studies conducted on major
ecosystem services provided by urban forests in Chinese cities like Beijing, Lanzhou,
Guangzhou, Jinan, Harbin, Nanjing, Hangzhou, Yangzhou, Dalian and Zhuhai (Jim and
Wendy, 2009). India can learn from the Chinese example because both of them are facing
almost similar urban population pressure.
Networking and international contacts proved to be crucial in urban forestry research
and development in Europe (Konijnendijk, 2003). An active programme of exchanges
and interactions could be established in India with relevant overseas universities, research
institutions and governmental agencies. Possibility of liaison and networking with
developing countries facing population pressures like India, e.g., China should also be
explored. Amelioration of global warming presents opportunities for urban forests to act
as carbon sinks and thereby could possibly be included in the potential future carbon
trade industry. Municipalities can recover costs incurred on urban forestry by trading in
carbon credits, which would accrue from reduction in greenhouse emissions.
Some academicians and forest functionaries have proposed to establish a ‘forest
regulatory authority’ for effective development of market mechanism for the ecological
services provided by Indian forests, including urban forests (Sharma et al., 2009).
Important issues to be addressed by this authority would be identification and
quantification of ecological services, identification of key beneficiaries, designing
ecological service charges for beneficiaries and other political/legal/institutional issues.
Such an authority could work properly and satisfactorily only after having results of well
designed ecosystem services-related research studies in respect of various kinds of forests
of India. In other words, deeper comprehension of forests ecosystem services could
provide plausible information for benefit-cost analysis of so called developmental
projects requiring green spaces (McPherson et al., 1999; Chen and Jim, 2008). The
ultimate purpose of taking up urban forest research studies is to address comprehensive
planning and scientific management of this valuable resource. Quantification and
valuation of ecosystem services provided by urban forestry could not only permit
comparison between alternate land-use options but also help to justify and augment
municipal investment in this green infrastructure (McPherson et al., 1997). Therefore
accumulation of scientific evidence and findings on urban forests for creating a
knowledge database is the urgent need of the hour in India. For the development of
India’s environmentally sustainable cities, a greater awareness of the ecosystem services
90 P. Chaudhry and V.P. Tewari
provided by city’s urban nature has to be fostered among political leaders, administrators
and general public.
Acknowledgements
The authors would like to thank the anonymous reviewers and editorial board of
Interdisciplinary Environmental Review (IER) for their valuable suggestions for the
improvement and development of the article. The authors would also like to thank
Dr. Klaus von Gadow, Professor of Forest Management at the Faculty of Forest Sciences
& Forest Ecology, George-August-University in Gottingen, Germany and an
extra-ordinary Professor at the department of Forest and Wood Sciences, Stellenbosch
University, South Africa for his advice on the development of the paper.
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... Several manuscripts also illustrated the challenges of maintaining and managing urban green spaces (Davies et al., 2017, Vogt et al., 2015. In India too, many scientists have conducted studies on urban green spaces , Chaudhry & Tewari, 2011. ...
... Despite this problem, the Chinese model of urban forestry is an excellent example worldwide . India should follow and recommend the Chinese model of urban forestry as the country has high population density and similar urban conditions (Chaudhry & Tewari, 2011). ...
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Urban Green Spaces (UGS) are an important resource and the living component of the urban infrastructure that plays a key role in maintaining the ecosystem. The city of Bilaspur in the central Indian state of Chhattisgarh, is one of the country's 100 smart cities has been selected for the study. This paper focuses on the spatial pattern of its urban green spaces. It includes two main objectives: firstly the analysis of land use and land cover (LULC) and secondly, the detailed listing of tree species along streets and dividers of the city. Satellite imagery of 2023 from satellite Senital 2 with Multi Spectral Instrument sensor is being used for LULC classification. The supervised classification revealed that the built-up area covered 22.34% of the area, while UGS covered about 6.78%. Since the main occupation of local residents are agriculture, agricultural land (58.24%) remained the dominant land use type. The area covered by water body and riverbed is 2.08% and 2.02% respectively. Ground truthing of study area revealed that 83 species from 15 families were recorded. Most of the tree species were recorded from the Fabaceae family, followed by Moraceae, Aarecaceae, Apocynaceae etc. Among the street tree species, 54.22% belong to the evergreen category and the remaining 45.78% are deciduous in nature. 59.04% of the trees are from India, while 40.96% are of exotic in nature. When categorizing tree species according to IUCN status, 47 trees fall into the Least Concern (LC) category and three tree species (Aegle marmelos, Dypsis lutescens and Eucalyptus camaldulensis) fall into the Near Threatened (NT) category. Tectona grandis belongs to the Endangered (EN) category, Wodyetia bifurcata is conservation dependant (CD) and Jacaranda mimosifolia, which is exotic in nature, is vulnerable (VU). The current work will be useful to study the UGS, distribution and pattern of tree species along the roads. This paper can serve as a database for upcoming research related to urban forestry. In addition, the work can help urban planners, policy makers, architects and academicians in implementing green infrastructure and species selection.
... Urban green space includes vegetation in and around urban Page254 https://iabcd.org.in/ areas that gives social, economic, environmental, and aesthetic benefits; this includes city parks, gardens, natural vegetation, green spaces on campus, private property, and roadside trees (Chaudhry & Tewari, 2011;Bherwani et al., 2022). Urban forest areas not only sequester carbon but also provide various ecosystem services such as biodiversity conservation, reduces temperature, microclimate regulation, stabilizing soil, groundwater recharge, and prevention of soil erosion (Singh et al., 2021). ...
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Urban-green areas provide various ecosystem services; one such service is that tree species lower the temperature in the atmosphere and have tremendous potential to sequent carbon. The present review particularly focuses on the different methods used for above-ground biomass estimation. Two methods, field methods (destructive and non-destructive), and remote sensing methods (optical remote sensing, RADAR, and LiDAR) are used for biomass estimation. It has been found that all these methods have some advantages and limitations. In addition to this, we have reviewed various case studies of urban tree species' potential to sequester carbon dioxide.
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The urbanization enhances the socioeconomic and technological growth of the city. The society is benefited in terms of employment opportunities, better lifestyle and healthcare facilities; however, the major drawback of urbanization is overcrowding and environmental degradation of the city. The need and importance of urban forestry is to be analyzed and various measures should be taken to utilize that knowledge in restoring the green cover for achieving the ecological development of a city. The growth pattern seen in the case of Pune city is the expansion of new settlements around the city core, without proper planning and understanding of urban forestry & green spaces. The scope of the research in this paper is limited to the identification of the existing issues in the urban forestry areas of Pune like the Lakes, Parks and gardens, hills, etc. and the solutions to mitigate those problems are mentioned herewith. The paper has anticipated future challenges and the scope for further research is the proposal of the areas identified for the development of urban forestry in Pune city to improve the urban greenery and create a livable space for the city dwellers.
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As urban forestry continues to evolve as a profession, foresters and arborists can expect many challenges as well as opportunities. The continuing development of cities has become linked to a much greater emphasis on urban vegetation, the growing demand for recreation amenities within the urban environment, and the careful and successful management of vegetation in an urban ecosystem. New ways to incorporate the highly versatile urban forest resource into the urban fabric will undoubtedly benefit the lives of its residents.
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A dry deposition model was employed to estimate air pollutant uptake by Sacramento's urban forest. Assuming 1990 air pollutant concentrations, model simulations estimated that approximately 1,457 metric tons of air pollutant are absorbed annually, at an implied value of US$28.7 million. The growing season daily uptake for ozone was approximately 2.4 metric tons per day, while particulate matter (< 10 μ diameter, PM10) uptake was slightly greater, at 2.7 metric tons per day. Daily uptake of NO2 and particulate matter represented 1% to 2% of anthropogenic emissions for the county. Estimated growing-season annual air pollutant uptake rates averaged 10.9 kg/(ha land area per yr) for the entire study area, 13.9 kg/(ha land area per yr) for urban areas and 4.2 kg/(ha land area per yr) for rural areas. Pollutant uptake rates decreased with decreasing tree canopy cover, along an urban-to-rural gradient.
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A one-dimensional mass and energy balance model was developed to simulate rainfall interception in Sacramento County, California. The model describes tree interception processes: gross precipitation, leaf drip, stem flow, and evaporation. Kriging was used to extend existing meteorological point data over the region. Regional land use/land cover and tree canopy cover were parameterized with data obtained by remote sensing and ground sampling. Annual interception was 1.1% for the entire county and 11.1% of precipitation falling on the urban forest canopy. Summer interception at the urban forest canopy level was 36% for an urban forest stand dominated by large, broadleaf evergreens and conifers (leaf area index = 6.1) and 18% for a stand dominated by medium-sized conifers and broadleaf deciduous trees (leaf area index = 3.7). For 5 precipitation events with return frequencies ranging from 2 to 200 years, interception was greatest for small storms and least for large storms. Because small storms are responsible for most pollutant washout, urban forests are likely to produce greater benefits through water quality protection than through flood control.
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The 3-year Chicago Urban Forest Climate Project examined how trees affect these components of the regional urban ecosystem. The region`s tree cover has increased from a presettlement level of about 13 percent to nearly 20 percent today. There are an estimated 50.8 million trees in the region; 66 percent in good or excellent condition. The trees tend to be small; 77 percent less than 15 cm d.b.h. Street trees are only 10 percent of the city`s trees, but 24 percent of leaf surface area because they are typically larger than off-street trees. During 1991, the region`s trees removed an estimated 6,145 tons of air pollutants, providing air cleansing worth 9.2million.Eachyeartheysequesteranestimated315,800metrictonsofcarbonandprovideresidentialheatingandcoolingenergysavingsthat,inturn,reducecarbonemissionsfrompowerplantsby12,600tonsannually.Increasingtreecover10percentorplantingaboutthreetreesperbuildinglotisestimatedtosaveannualheatingandcoolingcostsby9.2 million. Each year they sequester an estimated 315,800 metric tons of carbon and provide residential heating and cooling energy savings that, in turn, reduce carbon emissions from power plants by 12,600 tons annually. Increasing tree cover 10 percent or planting about three trees per building lot is estimated to save annual heating and cooling costs by 50 to 90perdwellingunitoncethetreesmature.Thenetpresentvalueofservicestreesprovideisestimatedas90 per dwelling unit once the trees mature. The net present value of services trees provide is estimated as 38 million, or $402 per planted tree. The present value of long-term benefits are more than twice the present value of costs.
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Urban forests provide various environmental, social and educational benefits to human society. The non-market benefits (NMBs) of such areas often are incorrectly valued or only partially incorporated into cost-benefit analysis of developmental projects and decision making on resource allocation – particularly in developing countries. The economic value to users of a city’s urban forests in a developing country like India has yet to be estimated. Therefore, Chandigarh, one of the planned cities of India, was selected for the estimation in the form of the “economic use value” of the nonmarket benefits of its forests. The mean willingness to pay (WTP) for the betterment of existing green landscape features and for creating new parks/gardens on the part of each family residing and earning in the city was estimated. The response to willingness to accept (WTA) compensation question was found to be very low because the people of the city reject the idea of receiving compensation in lieu of not visiting green areas of the city for their different purposes. Therefore, TP is likely to be more appropriate than WTA in order to assign a reasonable monetary value to the recreational aspect of an environmental amenity like urban parks or landscapes in the literate society of a developing country.
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Urban trees can favorably affect factors underlying global warming by storing carbon and by reducing energy needs for cooling and heating buildings. To estimate carbon stored in roots and above-ground portions of trees, data was collected consisting of whole tree sampling of Amelanchier, Malus, Pyrus, and Syringa cultivars. Roots were excavated using an Air-Spade™. Regression analysis resulted in two equations for predicting total carbon storage based on height and diameter of trees up to 20 cm dbh: Y = 0.05836 (dbh2) for root carbon storage, and Y = 0.0305 (dbh2 × h)0.9499 for above-ground carbon storage, explaining 97% and 96% of the variation, respectively. Average carbon stored in roots of various cultivars ranged from 0.3 to 1.0 kg for smaller trees, those 3.8 to 6.4 cm dbh, to more than 10.4 kg for trees 14.0 cm to 19.7 cm dbh. Average total carbon stored by cultivars ranged from 1.7 to 3.6 kg for trees less than 6.4 cm dbh to 54.5 kg for trees larger than 14.0 cm. The data from these equations apply mainly to trees in nurseries and recently transplanted trees. Comparisons showed that above-ground estimates from previous studies using a sampling technique overestimated values obtained from actual above-ground weights.
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All the usual methods for valuing non-market benefits and costs may be applied to the aesthetic values of urban trees. However, evaluation has most usually been undertaken by one of two apparently dissimilar methods. The expert approach uses a mixture of measurement and judgement. Different versions of the approach have different quantitative input, produce divergent results, and theoretical justifications of their cash value are lacking. The hedonic approach attempts to derive cash values from house prices. Here too problems of quantification arise, in choice of appropriate variables, in the form of relationships and in interaction of variables. An approach using the human eye's ability to synthesise disparate variables may overcome these problems, but there remain problems of collinearity between environmental and demographic variables. At least explicit recognition of judgement in the process allows open discussion of these problems.
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Trees benefit urban communities environmentally, esthetically and recreationally. This raises the question of whether Denmark’s towns have enough space for more trees. A research project investigated this by examining in detail the potential for more sustainable planning and management of urban green space in towns with 10,000–40,000 inhabitants and was completed in 1999. The paper describes the vegetation cover in selected urban areas, including the cover of woody vegetation (trees and shrubs) and discusses the land area potentially available for supplementary planting in urban zones. The method used to map urban vegetation is discussed and related to Denmark’s administrative practice and planning system. Case studies are presented for various categories of urban land use to highlight the variation in vegetation cover and to identify the land area available for increasing tree cover. Apart from undeveloped urban land, the largest areas potentially available for planting included industrial zones, institutional zones and apartment complexes. Other types of residential district lacked the coherent space normally required for sustainable planting. The cover of trees and shrubs in the case study towns is very limited, but large areas of non-functional lawn could be available for planting. Lawn comprised the largest proportion of the urban surface cover in the case studies. The findings of the case studies were assembled into data sets relating to each type of urban zone and summed up in green structure maps based on geographical information systems. This approach can provide an overview of best practices to allow areas lacking vegetation cover to be identified. This assessment method can usefully be applied to incorporate issues related to the urban natural environment and urban greening potential into conventional planning practice in Denmark’s municipalities.