Achyut Tiwari

Tribhuvan University · Central Department of Botany

Alpine treelines serve as vital indicators of the impacts of climate change on tree growth and forest distribution. They offer valuable insights into how shifting temperature and precipitation patterns affect ecosystems in treeline ecotones. Analyzing the age structure of tree stands at treelines provides a glimpse into how different generations of...

As a basic component of the forest ecosystem, the forest structure refers to the general distribution of plant species of different life forms and sizes. The characterization of forest structure is the key to understanding the vegetation history, present status, and future development trajectory of the forest ecosystems. The Chure region of Nepal c...

Climate influences both the structure and function of the forest ecosystem. A dendrochronological study was carried out in temperate forest at Patney Bhanjyang Community Forest of Kavrepalanchok district in Central Nepal to verify and record the impact of climate on radial growth by using the tree cores of Pinus wallichiana. A total of 60 tree core...

The cellulose is made up of long chains of polysaccharide of glucose molecules. Microfibrils are formed when numerous hydrogen-bonded cellulose chains unite, they are extremely stiff and contribute to physical stability, due to this general ability of forming these microfibrils to form long chains, cellulose is an ideal molecule for the manufacturi...

Drought episodes across the Himalayas are inevitable due to rapidly increasing atmospheric temperatures and uncertainties in rainfall patterns. Tarai of Nepal is a tropical region located in the foothills of the Central Himalaya as a country’s food granary with a contribution of over 50% to the entire country’s agricultural production. However, the...

Owing to its diverse climatic and topographic condition, Nepal hosts diverse forests and rich biodiversity which provide a variety of ecosystem goods and services. Spread of invasive alien plants, insect pests and pathogens (IAS) has been contributing to degrading forest ecosystem services in Nepal. This study outlined the status, distribution and...

Nepal represents a unique biodiversity which is associated with higher topographic variation and regional climate. The landscape 60 m above sea level reaching its maximum elevation up to 8.8 kilometers, strong monsoon system entering from south east of Nepal and westerly entering from the west contribute to considerable variety of life forms in the...

Gönpa Gang is an example of the traditional Buddhist architecture of Upper Mustang. It is also the first monument in Upper Mustang to be studied using the dendrochronological dating method. The gönpa is a two-story building of imposing size, made from simple elements of Tibetan architecture, namely masonry walls, timber posts, and beams. A total of...

The rate of species extinction has accelerated in the past few decades due to human-induced global changes. Establishing protected areas (PA) is one of the most viable solutions to averting this crisis. Although PA establishment in the past followed an ad-hoc approach without considering the conservation value of the prioritized areas, the developm...

The historical information about natural vegetation of Lumbini is not clearly known. Modern day human colonization around Mayadevi temple could have been intensified after Khadga Samsher's visit to Lumbini in 1896, followed by the eradication of Malaria in the Tarai of Nepal around the 1950s. The dense human settlements around the Mayadevi templ...

Plant diversity of Lumbini area was studied especially focusing on native plants, although large number of non-native species has been planted in the area. We have also compiled the plant species used by Lord Gautam Buddha during his life period through published literature. Altogether, 181 plant species belongs to 51 families were reported from th...

Abies pindrow(Royle ex D. Don.) Royle: Abies webbiana var. pindrow (Royle ex D. Don) Brandis; Pinus pindrow Royle ex. D. Don

Mustang valley in the central Himalaya of Nepal is a unique landscape formed by massive soil mass during a glacial period, which is attributed to a mix of vegetations and long agricultural history. Soil nutrients and their sourcing is highly important to understand the vegetation assemblage and land productivity in this arid zone. Twenty soil sampl...

Understanding animals' ranging behavior is critical for their management and conservation, especially for endangered and little-known species. In this study, one group of southern yellow-cheeked gibbons (Nomascus gabriellae), a highly threatened primate species distributed only in South Vietnam and Cambodia, was observed for one year in the lowland...

Background Climate change has altered the various ecosystem processes including forest ecosystem in Himalayan region. Although the high mountain natural forests including treelines in the Himalayan region are mainly reported to be temperature sensitive, the temperature-related water stress in an important growth-limiting factor for middle elevation...

Tree-rings from upper forest boundary including treelines provide reliable indications of climatic changes as tree growth at treelines is highly sensitive to climate (temperature and moisture). Tibetan Plateau (TP) includes the highest elevation treeline in the world, and they show both temperature as well as moisture as a critical climatic factor...

Tree-rings from upper forest boundary including treelines provide reliable indications of climatic changes as tree growth at treelines is highly sensitive to climate (temperature and moisture). Tibetan Plateau (TP) includes the highest elevation treeline in the world, and they show both temperature as well as moisture as a critical climatic factor...

Climate change has been an established scientific fact for every aspect of human life and for the entire biosphere. Climatic changes are quite exciting processes that are associated with evolution, speciation and diversification of life as well as their migration and extinction. Although we know that the Earth's climate is ever changing due to natu...

Medicinal plants are key components of the livelihoods of rural people, who rely on forest resources in the Nepal Himalaya, and this reliance is particularly high in hills and mountainous areas. Persistent premature and overharvesting, and inadequate knowledge of sustainable harvesting are additional threats to medicinal plants, acerbated by land u...

Tree rings provide an important biological archive for climate history in relation to the physiological mechanism of tree growth. Higher elevation forests including treelines are reliable indicators of climatic changes, and tree growth at most elevational treelines are sensitive to temperature at moist regions, while it is sensitive to moisture in...

Changes in population structure and plant functional traits across environmental gradient in the near natural treeline is a critical determinant of environmental changes in treelines. In this study we analyzed population characteristics and leaf traits of Rhododendron campanulatum across treeline ecotone in a trans-Himalayan region of Mustang distr...

Nepal is located in the central part of the greater Himalayan range with a unique series of mountain chains formed by recent mountain building geological events. As one of the youngest mountains in the world it contributes to diversity of plants and also provided barriers to and corridors through which plants migrated during the ice ages. The highe...

Changes in treeline dynamics are, considered reliable indicators of rapidly changing climate in Himalayan mountains. This paper is aimed at exploring treeline forming species in Nepal Himalaya, their growth-climate relationship and shifting response of climate change to improve our understanding on existing methodologies of treeline studies. It was...

Weed management in the crop field is one of the major challenges of agriculture. It has been reported that new weeds are encroaching crop fields due to anthropogenic activities such as the use of insecticides, pesticides and chemical fertilizer, and also due to climatic changes including warming temperatures, erratic and unseasonal precipitation, f...

This analysis provides an additional evidence of the usefulness of Ephedra intermedia for dendrochronological research. The spring season (March-May) precipitation was found to be critical for annual radial growth of E. intermedia, which is consistent with the tree radial growth response in the study area. This confirms that shrubs and dwarf shrubs...

Changes in the position of altitudinal treelines and timberlines are considered useful indicators of climatic changes on tree growth and forest dynamics. We sought to determine if recent warming is driving contrasting growth responses of Himalayan birch, at moist treeline (Lete Lekh) and semi-arid timberline (Chimang Lekh) sites in the Trans-Himala...