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Selection: Pereira:J [20 articles] 

Publications by author Pereira:J.

Ecological interactions between cork oak (Quercus suber L.) and stone pine (Pinus pinea L.): results from a pot experiment

Forests, Vol. 9, No. 9. (01 September 2018), 534,


Portuguese cork oak (Quercus suber L.) extended mortality and lack of regeneration have been the drivers of important changes in the traditional cork oak woodlands (savanna-like) montado. The decrease in tree cover fosters the mixture with stone pine (Pinus pinea L.) for pine-nut production providing shelter for oak regeneration. The use of nurse species, namely pines, to help Quercus spp. regeneration is known, but whether cork oak could be favoured by the mixture with stone pine remains a question. A pot ...


A new global burned area product for climate assessment of fire impacts

Global Ecology and Biogeography, Vol. 25, No. 5. (May 2016), pp. 619-629,


[Aim] This paper presents a new global burned area (BA) product developed within the framework of the European Space Agency's Climate Change Initiative (CCI) programme, along with a first assessment of its potentials for atmospheric and carbon cycle modelling. [Innovation] Methods are presented for generating a new global BA product, along with a comparison with existing BA products, in terms of BA extension, fire size and shapes and emissions derived from biomass burnings. [Main conclusions] Three years of the global BA product were ...


Atmospheric conditions associated with the exceptional fire season of 2003 in Portugal

International Journal of Climatology, Vol. 26, No. 13. (15 November 2006), pp. 1741-1757,


The summer of 2003 was characterised by exceptional warm weather in Europe, particularly during the first two weeks of August, when a devastating sequence of large fires was observed, reaching an amount of circa 450 000 ha, the largest figure ever recorded in Portugal in modern times. They were concentrated in two relatively confined regions of Portugal and a considerable proportion of burnt area was due to fires started on the 2nd and 3rd of August. [\n] It is shown that the ...


Exploring the spatial patterns of fire density in southern Europe using geographically weighted regression

Applied Geography, Vol. 51 (July 2014), pp. 143-157,


[Highlights] [::] We explored the spatial patterns of fire density in two regions of Southern Europe. [::] Geographically Weighted Regression was applied to investigate main drivers of fire. [::] A strong spatial variability of the explanatory power of the variables was found. [::] Precipitation, livestock and shrubland were significant factors in both regions. [::] Fire prevention strategies can be adjusted to particular fire conditions in an area. [Abstract] The spatial patterns of fire occurrence were analyzed in two regions of Southern Europe, focusing on the long-term factors that ...


Relationships between human population density and burned area at continental and global scales

PLoS ONE, Vol. 8, No. 12. (16 December 2013), e81188,


We explore the large spatial variation in the relationship between population density and burned area, using continental-scale Geographically Weighted Regression (GWR) based on 13 years of satellite-derived burned area maps from the global fire emissions database (GFED) and the human population density from the gridded population of the world (GPW 2005). Significant relationships are observed over 51.5% of the global land area, and the area affected varies from continent to continent: population density has a significant impact on fire over most ...


European atlas of forest tree species

Keywords: bioeconomy   chorology   classification   climate   constrained-spatial-multi-frequency-analysis   data-heterogeneity   data-integration   data-uncertainty   disasters   disturbances   ecological-zones   ecology   ecosystem-services   europe   floods   forest-fires   forest-pests   forest-resources   free-software   geospatial   geospatial-semantic-array-programming   gis   gnu-bash   gnu-linux   gnu-octave   habitat-suitability   integrated-modelling   integrated-natural-resources-modelling-and-management   integration-techniques   knowledge-integration   landslides   mastrave-modelling-library   modelling-uncertainty   open-data   paleoecology   relative-distance-similarity   reproducible-research   review   science-policy-interface   science-society-interface   semantic-array-programming   semantic-constraints   semantics   semap   software-uncertainty   soil-erosion   soil-resources   species-distribution   tree-species   uncertainty   water-resources   windstorm  


[Excerpt] The European Atlas of Forest Tree Species is the first comprehensive publication of such a unique and essential environmental resource, that is, our trees. Leading scientists and forestry professionals have contributed in the many stages of the production of this atlas, through the collection of ground data on the location of tree species, elaboration of the distribution and suitability maps, production of the photographic material and compilation of the different chapters. The European Atlas of Forest Tree Species is both ...


O melhoramento do eucalipto em Portugal

In O Eucaliptal em Portugal, Impactes ambientais e investigação cientifica (2007), pp. 61-110

Agentes bióticos do eucalitpo em Portugal

In O Eucaliptal em Portugal, Impactes ambientais e investigação cientifica (2007), pp. 255-282

Aboveground biomass production in an irrigation and fertilization field experiment with Eucalyptus globulus

Annales des Sciences Forestières, Vol. 46, No. Supplement. (1989), pp. 526s-528s,

Silvicultura: a Gestão dos Ecossistemas Florestais



m Portugal, as florestas cobrem actualmente cerca de 1/3 do território do continente e têm elevado valor económico e social. A escrita desta obra surgiu da necessidade de transmitir aos interessados na gestão das florestas as ideias essenciais sobre a maneira de conduzir os povoamentos florestais e deles tirar proveito, quer pela produção de bens comercializáveis, como a mdeira e a cortiça, quer pelo cumprimento de funções de protecção e de preservação da biodiversidade. Nas últimas duas décadas verificaram-se alterações substanciais nos conceitos, ...


Phenolic profile in the quality control of walnut (Juglans regia L.) leaves

Food Chemistry, Vol. 88, No. 3. (2004), pp. 373-379,


Qualitative and quantitative determinations of phenolic compounds were carried out on walnut leaves samples from six different cultivars, with the same agricultural, geographical and climatic conditions. The evolution of major phenolic compounds amounts was monitored from May to September. Two extractive procedures were assayed and best results were obtained using acidified water and a solid phase extraction column purification step. Qualitative analysis was performed by HPLC-DAD/MS and, in all samples, seven phenolic compounds were identified (3-caffeoylquinic, 3-p-coumaroylquinic and 4-p-coumaroylquinic acids, quercetin ...


Pinus pinaster L.

In Pines of Silvicultural Importance (2002), pp. 316-328
edited by CABI
Keywords: ecology   monography   pinus-cembra  


The genus Pinus is of great ecological and commercial importance and it is notable for its vast geographic range and the sheer area that its various species occupy. Its natural range is almost exclusively in the northern hemisphere, where it often forms the dominant vegetation cover. However, it is also of silvicultural significance in many countries in the southern hemisphere. Pines play an important role in the ecosystems of which they form part, and provide a valuable source of fibre, timber and ...


IPCC fifth assessment synthesis report - Climate Change 2014 synthesis report

(1 November 2014)


The Synthesis Report (SYR) of the IPCC Fifth Assessment Report (AR5) provides an overview of the state of knowledge concerning the science of climate change, emphasizing new results since the publication of the IPCC Fourth Assessment Report in 2007 (AR4). The SYR synthesizes the main findings of the AR5 (IPCC) based on contributions from Working Group I (The Physical Science Basis), Working Group II (Impacts, Adaptation and Vulnerability), and Working Group III (Mitigation of Climate Change), plus two additional IPCC reports ...


Cork oak woodlands on the edge: ecology, adaptive management, and restoration



[Excerpt] Scientific research on cork oak and the ecosystems where it thrives is patchy. Results are scattered and usually limited to a single discipline, such as genetics, silviculture, or the physical properties of cork, and the few broad, interregional, multidisciplinary treatments are out of date. The present book is the result of a 4-year European Commission–funded research program (Conservation and Restoration of European Cork Oak Woodlands [.CREOAK], QLKS-CT-2002-01594) that ran from 2002 to 2006. Consortium members included researchers and engineers from ...


Mediterranean cork oak savannas require human use to sustain biodiversity and ecosystem services

Frontiers in Ecology and the Environment, Vol. 9, No. 5. (10 June 2011), pp. 278-286,


Mediterranean cork oak savannas, which are found only in southwestern Europe and northwestern Africa, are ecosystems of high socioeconomic and conservation value. Characterized by sparse tree cover and a diversity of understory vegetation – ranging from shrub formations to grasslands – that support high levels of biodiversity, these ecosystems require active management and use by humans to ensure their continued existence. The most important product of these savannas is cork, a non-timber forest product that is periodically harvested without requiring tree ...


Global and regional vegetation fire monitoring from space: planning a coordinated international effort



[Introduction] Increasing conflagrations of forests and other lands throughout the world during the 1980s and 1990s have made fires in forest and other vegetation emerge as an important global concern. Both the number and severity of wildfires (accidental fires) and the application of fire for land-use change, seem to have increased dramatically compared to previous decades of the twentieth century. The adverse consequences of extensive wildfires cross national boundaries and have global impacts. Fire regimes are changing with climate variability and ...


Climate control of terrestrial carbon exchange across biomes and continents

Environmental Research Letters, Vol. 5, No. 3. (01 July 2010), 034007,
by Chuixiang Yi, Daniel Ricciuto, Runze Li, John Wolbeck, Xiyan Xu, Mats Nilsson, Luis Aires, John D. Albertson, Christof Ammann, M. Altaf Arain, Alessandro C. de Araujo, Marc Aubinet, Mika Aurela, Zoltán Barcza, Alan Barr, Paul Berbigier, Jason Beringer, Christian Bernhofer, Andrew T. Black, Paul V. Bolstad, Fred C. Bosveld, Mark S. J. Broadmeadow, Nina Buchmann, Sean P. Burns, Pierre Cellier, Jingming Chen, Jiquan Chen, Philippe Ciais, Robert Clement, Bruce D. Cook, Peter S. Curtis, D. Bryan Dail, Ebba Dellwik, Nicolas Delpierre, Ankur R. Desai, Sabina Dore, Danilo Dragoni, Bert G. Drake, Eric Dufrêne, Allison Dunn, Jan Elbers, Werner Eugster, Matthias Falk, Christian Feigenwinter, Lawrence B. Flanagan, Thomas Foken, John Frank, Juerg Fuhrer, Damiano Gianelle, Allen Goldstein, Mike Goulden, Andre Granier, Thomas Grünwald, Lianhong Gu, Haiqiang Guo, Albin Hammerle, Shijie Han, Niall P. Hanan, László Haszpra, Bernard Heinesch, Carole Helfter, Dimmie Hendriks, Lindsay B. Hutley, Andreas Ibrom, Cor Jacobs, Torbjörn Johansson, Marjan Jongen, Gabriel Katul, Gerard Kiely, Katja Klumpp, Alexander Knohl, Thomas Kolb, Werner L. Kutsch, Peter Lafleur, Tuomas Laurila, Ray Leuning, Anders Lindroth, Heping Liu, Benjamin Loubet, Giovanni Manca, Michal Marek, Hank A. Margolis, Timothy A. Martin, William J. Massman, Roser Matamala, Giorgio Matteucci, Harry McCaughey, Lutz Merbold, Tilden Meyers, Mirco Migliavacca, Franco Miglietta, Laurent Misson, Meelis Mölder, John Moncrieff, Russell K. Monson, Leonardo Montagnani, Mario Montes-Helu, Eddy Moors, Christine Moureaux, Mukufute M. Mukelabai, J. William Munger, May Myklebust, Zoltán Nagy, Asko Noormets, Walter Oechel, Ram Oren, Stephen G. Pallardy, Kyaw Tha Paw, João S. Pereira, Kim Pilegaard, Krisztina Pintér, Casimiro Pio, Gabriel Pita, Thomas L. Powell, Serge Rambal, James T. Randerson, Celso von Randow, Corinna Rebmann, Janne Rinne, Federica Rossi, Nigel Roulet, Ronald J. Ryel, Jorgen Sagerfors, Nobuko Saigusa, María J. Sanz, Giuseppe-Scarascia Mugnozza, Hans P. Schmid, Guenther Seufert, Mario Siqueira, Jean-François Soussana, Gregory Starr, Mark A. Sutton, John Tenhunen, Zoltán Tuba, Juha-Pekka Tuovinen, Riccardo Valentini, Christoph S. Vogel, Jingxin Wang, Shaoqiang Wang, Weiguo Wang, Lisa R. Welp, Xuefa Wen, Sonia Wharton, Matthew Wilkinson, Christopher A. Williams, Georg Wohlfahrt, Susumu Yamamoto, Guirui Yu, Roberto Zampedri, Bin Zhao, Xinquan Zhao


Understanding the relationships between climate and carbon exchange by terrestrial ecosystems is critical to predict future levels of atmospheric carbon dioxide because of the potential accelerating effects of positive climate–carbon cycle feedbacks. However, directly observed relationships between climate and terrestrial CO 2 exchange with the atmosphere across biomes and continents are lacking. Here we present data describing the relationships between net ecosystem exchange of carbon (NEE) and climate factors as measured using the eddy covariance method at 125 unique sites ...


Forest fires in the European Mediterranean region: mapping and analysis of burned areas

In Earth Observation of Wildland Fires in Mediterranean Ecosystems (2009), pp. 189-203,
edited by Emilio Chuvieco


Approximately 60,000 fires occur in the European Mediterranean region every year. On average, they burn approximately half a million ha of forest areas. The mapping of areas burned by forest fires is of critical importance for the analysis of fire impact and for the monitoring of fire recurrence and vegetation recovery in affected areas. An important contribution of remote sensing in wildfire monitoring is the mapping and analysis of burnt areas. Areas affected by forest fires present a distinct spectral response ...


Assessment of fire selectivity in relation to land cover and topography: a comparison between Southern European countries

International Journal of Wildland Fire (2013),


Land cover distribution is one of the factors that influence fire behaviour and its consequences in the landscape. The relation between land cover type and fire was investigated at a broad scale, in order to analyse land cover differences in fire proneness. The selection ratio for nine different land cover categories was calculated for the fire perimeters mapped in Southern Europe between 2000 and 2008. The results obtained were then compared per country and region. The fire proneness of topographic classes ...


Modeling spatial patterns of fire occurrence in Mediterranean Europe using multiple regression and random forest

Forest Ecology and Management, Vol. 275 (July 2012), pp. 117-129,


[Abstract] Fire occurrence, which results from the presence of an ignition source and the conditions for a fire to spread, is an essential component of fire risk assessment. In this paper, we present and compare the results of the application of two different methods to identify the main structural factors that explain the likelihood of fire occurrence at European scale. [\n] Data on the number of fires for the countries of the European Mediterranean region during the main fire season (June–September) were obtained ...

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