Joana Amaral Paulo

University of Lisbon | UL · Forest Research Center (CEF)

• Objective The objective of the research was to develop a generalized height–diameter model for Quercus suber L. in Portugal, which can be applied both to undebarked and debarked trees, with diameter at breast height over cork larger than 2.5 cm. • Methods A nonlinear fixed effects model (NLFEM) and a nonlinear mixed effects model (NLMEM) approach...

Site productivity, assessed through site index, was modelled using partial least squares regression as a function of soil and climatic variables. Two alternative models were developed: a full model, considering all available explanatory variables, and a reduced model, considering only variables that can be obtained without digging a soil pit. The r...

The influence of tree and stand variables, debarking intensity, and precipitation on the caliper of cork produced by a tree and on the evolution of cork caliper between consecutive cork extractions was researched. A total of 370 cork samples were collected in 23 permanent plots distributed across the cork production area in Portugal, covering a per...

Key message: The use of increasing debarking during the first harvest of cork oak trees (Quercus suberL.) had no effect on the secondary cork calliper (thickness) in one of the trials and had a small negative effect in a second trial. Little evidence was found that debarking coefficient is a useful index for the management of cork oak stands. Conte...

The annual growth and the thickness of cork are known to be highly variable between trees located in the same geographical location. Researching how climate variables affect different trees within the same site is a step forward for the management of cork production since current knowledge focusses only on the average tree response. Quantile regres...

Climatic factors drive the annual growth of cork and the subsequent increase in its thickness, which, in addition to porosity, determines the price of cork. Therefore, the simulation of cork thickness is a crucial module of forest growth simulators for cork oak stands. As the existing cork growth models are independent of climatic factors, cork thi...

The land use sector currently represents ∼25% of the global greenhouse gas emissions, thus this human activity is having a huge impact on climate change. Semi-arid climate areas, which are widely distributed, are particularly influenced by such climate change. In these areas, land use changes have transformed the entire landscape and increased the...

Shrub encroachment is a global change driver occurring in a wide range of ecosystems, including in tree plantations. This phenomenon is known to affect tree physiology and overall ecosystem functioning and productivity. In tree plantations, forest management, such as shrub clearing and tree thinning, aims to increase wood and non-woody products yie...

Shrub encroachment is a global phenomenon occurring in a wide range of ecosystems, including in tree plantations, which is known to affect ecosystem functioning and productivity. Forest management in tree plantations (e.g. shrub clearing, tree thinning and pruning) often aims to increase wood and non-woody products yield while optimizing other ecos...

Theme: Agroforestry systems and innovations Abstract Innovation is one of the key aspects to favour transition from conventional to more sustainable agricultural practices in developed countries. Europe is leading nowadays the development of a good knowledge infrastructure to move on this transition mainly related with the Thematic Networks. The Ag...

Traditional forms of agroforestry are often recognized as exemplar systems that successfully integrate food production, biodiversity conservation and high cultural values. However many traditional agroforestry systems in Europe are in decline or are threatened and the perspectives of local stakeholders on the production, management, socio-economic,...

Quassia amara L. is a semi-sciophyte species that can be found growing as a large shrub or a small tree in Neotropical rainforests. It is traditionally harvested as a non-wood forest product for culinary, medicinal and insecticidal uses. Lack of knowledge on the ecological conditions that support tree growth limits the development of sustainable fo...

Scheduling the first thinning in young cork oak stands is an important decision in management that is usually subjectively defined by each manager. An analysis of competition in cork oak plantations is extremely relevant as a support for this important decision. This study aimed to understand the relationship between stand characteristics and tree...

Country size 30-year monitoring of oak woodlands, based on the open-access article of the same name (https://doi.org/10.3390/rs11050525). This presentation focuses on the methodology adopted to compare and harmonize data from different sources (MODIS, Landsat 5 and Landsat 7 passive sensors).

Abstract The ‘montado’ is an oak-dominated woodland ecosystem, distributed along the Iberian Peninsula. It is dominated by the cork oak (Quercus suber L.), the species responsible for the production of the cork. Maps concerning the species potential distribution in Portugal have been based on climate and soil thresholds. However, these maps do not...

Agroforestry systems, in which trees are integrated in arable or pasture land, can be used to enable sustainable food, material, and energy production (i.e. provide provisioning ecosystem services) whilst reducing the negative environmental impacts associated with farming. However, one constraint on the uptake of agroforestry in Europe is a lack of...

Main knowledge gaps and innovations identified by the RAIN • Agroforestry in the corners of irrigation pivots for increasing irrigation water usage. • Usage of ramial chipped wood of eucalyptus as a natural fertilizer • Using fast growing species for biomass production in alley cropping systems • Agroforestry in vineyard systems and other tradition...

Quassia amara L. is a semi sciophyte species that can be found growing as a large shrub or a small tree in Neotropical rainforests. The objective of the present work was to compare tree growth in distinct plots, and research the impact of light conditions in diameter and total height growth. Quassia amara L. growth under different shading condition...

NWFPs show a variety of connections to the concept of smart, inclusive development in a bioeconomy. However, there is no substantial body of evidence that comprehensively considers NWFPs in the context of a bioeconomy. Based on the knowledge collected in this report, this chapter describes a few examples of the contribution of NWFPs as a basis for...

Those images can be obtained in GeoTiff (30-m spatial resolution) by contacting the authors: Valentine Aubard, vaubard@isa.ulisboa.pt; Joana Amaral Paulo, joanaap@isa.ulisboa.pt ; João M. N. Silva, joaosilva@isa.ulisboa.pt. Full-text available at https://doi.org/10.3390/rs11050525. To cite the article: Aubard, V.; Paulo, J.A.; Silva, J.M.N. Long-Te...

Oak stands are declining in many regions of southern Europe. The goal of this paper is to assess this process and develop an effective monitoring tool for research and management. Long-term trends of the Normalized Difference Vegetation Index (NDVI) were derived and mapped at 30-m spatial resolution for all areas with a stable land cover of cork oa...

Key message Volume predictions of sample trees are basic inputs for essential National Forest Inventory (NFI) estimates. The predicted volumes are rarely comparable among European NFIs because of country-specific dbh-thresholds and differences regarding the inclusion of the tree parts stump, stem top, and branches. Twenty-one European NFIs implemen...

Understory management practices and stand density characteristics allow one to distinguish a cork oak traditional silvopastoral system (known as a montado) from a cork oak forest system. Although understanding the manner in which different management practices affect cork growth is imperative, there are still only a few outputs from experimental re...

Food security, climate change mitigation, and land use challenges are inter-linked and need to be considered simultaneously. One possible solution is sustainable intensification, which is the practice of increasing food production per area of land whilst also reducing the environmental impacts associated with this. Agroforestry has been stated to b...

Presentation on Agroforestry Systems in Agroglobal 2018. Available here: http://hdl.handle.net/10400.5/15944

Whilst the benefits of agroforestry are widely recognised in tropical latitudes few studies have assessed how agroforestry is perceived in temperate latitudes. This study evaluates how stakeholders and key actors including farmers, landowners, agricultural advisors, researchers and environmentalists perceive the implementation and expansion of agro...

Agroforestry combines perennial woody elements (e.g. trees) with an agricultural understory (e.g. wheat, pasture) which can also potentially be used by a livestock component. In recent decades, modern agroforestry systems have been proposed at European level as land use alternatives for conventional agricultural systems. The potential range of bene...

Land use systems that integrate woody vegetation with livestock and/or crops and are recognised for their biodiversity and cultural importance can be termed high nature and cultural value (HNCV) agroforestry. In this review, based on the literature and stakeholder knowledge, we describe the structure, components and management practices of ten cont...

Potential benefits and costs of agroforestry practices have been analysed by experts, but few studies have captured farmers’ perspectives on why agroforestry might be adopted on a European scale. This study provides answers to this question, through an analysis of 183 farmer interviews in 14 case study systems in eight European countries. The study...

Purpose The aim of the present study is to assess the influence of two different attributional life cycle assessment (LCA) approaches, namely static LCA (sLCA) and dynamic LCA (dLCA), through their application to the calculation of the carbon footprint (CF) of the entire cork sector in Portugal. The effect of including biogenic carbon sequestration...

Foreword. It is a great pleasure to share with you the excellent book of abstracts of the 4th European Agroforestry Conference carried out in the beautiful city of Nijmejen (The Netherlands) during the European Green Capital 2018. The book is plenty of extraordinary information and experiences about agroforestry practices and systems around the wo...

Aim of study: Cork oak is one of the main forest tree species in Portugal that typically occurs in montado, where operational practices oriented to the tree, crop or animal management may influence several of the ecosystem components. This study aimed at contributing to fulfil the a lack of knowledge on the effect of these practices on the cork and...

This study aims to assess the current state of the cork oak woodlands in Portugal and to provide silvicultural guidelines that allow assuring medium and long-term sustainability. The analysis was based on the data from the NFI carried out in 2005- 2006 (NFI5). Analysis of the occupancy of the sampled stands confirms the existence of low densities o...

Aim of study: Use the SUBER model to evaluate the influence of the cork debarking rotation period (CDR) on equivalent annual annuity (EAA) value. Area of study: Nine simulated stands, varying in site index (14.4, 15.6, 17.1) and cork quality characteristics (high, medium, low). Material and methods: EAA values were computed considering CDR period...

Management objectives and techniques in woodlands dominated by Quercus species have changed dramatically over the last few decades, especially in the case of coppices. The fact that these stands are of little economic importance today is in part compensated by their value, for example, as carbon sinks. The identification of this important role of Q...

An accurate and objective estimate on the extent of agroforestry in Europe is critical for the development of supporting policies. For this reason, a more harmonised and uniform Pan-European estimate is needed. The aim of this study was to quantify and map the distribution of agroforestry in the European Union. We classified agroforestry into three...

Recent studies projecting future climate change impacts on forests mainly consider either the effects of climate change on productivity or on disturbances. However, productivity and disturbances are intrinsically linked because 1) disturbances directly affect forest productivity (e.g. via a reduction in leaf area, growing stock or resource-use effi...

Presentation at the I encontro nacional de estudantes florestais. 20th November 2016. Instituto Superior de Agronomia.

http://hdl.handle.net/10400.5/15014

The periodic harvest of cork may cause stress to the trees. It is assumed that the level of tree stress increases proportionally to debarking intensity, usually evaluated by the value of the debarking coefficient: ratio of debarking height and perimeter at breast height. This response highly varies from tree to tree, between stands, and according t...

This report (updated in August 2016) is an output from work-package 1 which aims to understand the context and extent of agroforestry in Europe. In an earlier report, den Herder et al (2015) reviewed literature sources to provide a preliminary estimate of the extent of agroforestry in Europe. That report (which collected only limited data from some...

The production of non-wood forest products (NWFP) can be positively affected by silvicultural practice; a revision of current silvicultural practice can influence increased yields of both direct and indirect NWFP. This document aims to provide an overview of selected management systems employed for the production of NWFP in Europe.

Available at: http://www.agforward.eu/index.php/en/yield-safe-model-improvements.html

Decision support systems (DSSs) help decision makers such as forest owners and forestry professionals when they are making forest management decisions at stand, FMU and regional levels. Solution from DSSs is a recommendation how to manage forest and it also includes measures that describe the outcomes of certain management regime. Until now, the ro...

Available at: http://www.agroforestry.eu/conferences/III_EURAFConference

Available at: http://www.agroforestry.eu/conferences/III_EURAFConference

A generalized non-linear tree crown diameter model was developed with the aim of allowing the computation of tree crown diameter over a large range of tree dimensions, and allowing its inclusion in forest growth and yield models. The model was formulated to provide biological meaning to the predicted values. Due to the nested structure of the data...

The deliverable identify the improvements developed or needed to be developped in order to overcome the possible weaknesses of different MPT and NWFP models. The main body of the deliverable is structured in two chapters. The first part (chapter 2) is focused on those existing models that already present a high degree of development and that were a...

http://hdl.handle.net/10400.5/9280 http://hdl.handle.net/10400.5/9292

http://hdl.handle.net/10400.5/9280

Cork oak stands are one of the major sources of income from Portuguese Mediterranean forests. Future climate is projected to increase temperatures, reduce precipitation and decrease current forests’ productivity and therefore, adapting management, is a key strategy to mitigate impacts of future climate on cork supply. The central objective of this...

Available in http://www.agforward.eu/index.php/pt/montado-portugal-843.html

The objective of the study was to research the influence of precipitation, tree variables, site characteristics and debarking intensity in the evolution of cork caliber at individual tree level. A mixed model approach was used in addition to partial least squares analysis. In 23 permanent plots two consecutive cork extraction operations were follow...

http://www.agforward.eu/index.php/pt/montado-portugal-843.html