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2 resultados encontrados para: AUTOR: Slik, J. W. Ferry
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We combined two existing datasets of vegetation aboveground biomass (AGB) (Proceedings of the National Academy of Sciences of the United States of America, 108, 2011, 9899; Nature Climate Change, 2, 2012, 182) into a pan-tropical AGB map at 1- km resolution using an independent reference dataset of field observations and locally calibrated high-resolution biomass maps, harmonized and upscaled to 14 477 1-km AGB estimates. Our data fusion approach uses bias removal and weighted linear averaging that incorporates and spatializes the biomass patterns indicated by the reference data. The method was applied independently in areas (strata) with homogeneous error patterns of the input (Saatchi and Baccini) maps, which were estimated from the reference data and additional covariates. Based on the fused map, we estimated AGB stock for the tropics (23.4 N–23.4 S) of 375 Pg dry mass, 9–18% lower than the Saatchi and Baccini estimates. The fused map also showed differing spatial patterns of AGB over large areas, with higher AGB density in the dense forest areas in the Congo basin, Eastern Amazon and South-East Asia, and lower values in Central America and in most dry vegetation areas of Africa than either of the input maps. The validation exercise, based on 2118 estimates from the reference dataset not used in the fusion process, showed that the fused map had a RMSE 15–21% lower than that of the input maps and, most importantly, nearly unbiased estimates (mean bias 5 Mg dry mass ha 1 vs. 21 and 28 Mg ha 1 for the input maps). The fusion method can be applied at any scale including the policy-relevant national level, where it can provide improved biomass estimates by integrating existing regional biomass maps as input maps and additional, country-specific reference datasets.


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An estimate of the number of tropical tree species
Slik, J. W. Ferry (autor) ; Arroyo Rodríguez, Víctor (autor) ; Aiba, Shin-Ichiro (autor) ; Álvarez Loayza, Patricia (autora) ; Alves, Luciana F. (autora) ; Ashton, Peter S. (autor) ; Balvanera, Patricia (autora) ; Bastian, Meredith L. (autora) ; Bellingham, Peter J. (autor) ; van den Berg, Eduardo (autor) ; Bernacci, Luis (autor) ; da Conceição Bispo, Polyanna (autora) ; Blanc, Lilian (autora) ; Böhning Gaese, Katrin (autora) ; Boeckx, Pascal (autor) ; Bongers, Frans (autor) ; Boyle, Brad (autor) ; Bradford, Matt (autor) ; Brearley, Francis Q. (autor) ; Breuer-Ndoundou Hockemba, Mireille (autora) ; Bunyavejchewin, Sarayudh (autora) ; Calderado Leal Matos, Darley (autora) ; Castillo Santiago, Miguel Ángel (autor) ; Catharino, Eduardo L. M. (autor) ; Chai, Shauna-Lee (autora) ; Chen, Yukai (autor) ; Colwell, Robert K. (autor) ; Chazdon, Robin L. (autor) ; Clark, Connie (autora) ; Clark, David B. (autor) ; Clark, Deborah A. (autora) ; Culmsee, Heike (autora) ; Damas, Kipiro (autor) ; Dattaraja, Handanakere S. (autor) ; Dauby, Gilles (autor) ; Davidar, Priya (autora) ; DeWalt, Saara J. (autora) ; Doucet, Jean-Louis (autor) ; Duque, Alvaro (autor) ; Durigan, Giselda (autora) ; Eichhorn, Karl A. O. (autora) ; Eisenlohr, Pedro V. (autor) ; Eler, Eduardo (autor) ; Ewango, Corneille (autor) ; Farwig, Nina (autora) ; Feeley, Kenneth J. (autor) ; Ferreira, Leandro (autor) ; Field, Richard (autor) ; de Oliveira Filho, Ary Teixeira (autor) ; Fletcher, Christine (autora) ; Forshed, Olle (autor) ; Franco, Geraldo (autor) ; Fredriksson, Gabriella Margit (autora) ; Gillespie, Thomas (autor) ; Gillet, Jean-François (autor) ; Amarnath, Giriraj (autor) ; Griffith, Daniel M. (autor) ; Grogan, James (autor) ; Gunatilleke, Nimal (autor) ; Harris, David (autor) ; Harrison, Rhett (autor) ; Hector, Andy (autor) ; Homeier, Jürgen (autor) ; Imai, Nobuo (autor) ; Itoh, Akira (autora) ; Jansen, Patrick A. (autora) ; Joly, Carlos A. (autor) ; De Jong, Bernardus Hendricus Jozeph (autor) ; Kartawinata, Kuswata (autora) ; Kearsley, Elizabeth (autora) ; Kelly, Daniel L. (autor) ; Kenfack, David (autor) ; Kessler, Michael (autor) ; Kitayama, Kanehiro (autor) ; Kooyman, Robert (autor) ; Larney, Eileen (autora) ; Laumonier, Yves (autor) ; Laurance, Susan (autora) ; Laurance, William F. (autor) ; Lawes, Michael J. (autor) ; Leao do Amaral, Ieda (autora) ; Letcher, Susan G. (autora) ; Lindsell, Jeremy (autor) ; Lu, Xinghui (autor) ; Mansor, Asyraf (autor) ; Marjokorpi, Antti (autor) ; Martin, Emanuel H. (autor) ; Meilby, Henrik (autor) ; Melo, Felipe P. L. (autor) ; Metcalfe, Daniel J. (autor) ; Medjibe, Vincent P. (autor) ; Metzger, Jean Paul (autor) ; Millet, Jerome (autor) ; Mohandass, D. (autor) ; Montero, Juan C. (autor) ; de Morisson Valeriano, Márcio (autor) ; Mugerwa, Badru (autor) ; Nagamasu, Hidetoshi (autor) ; Nilus, Reuben (autor) ; Ochoa Gaona, Susana (autora) ; Onrizal, Onrizal (autor) ; Page, Navendu (autor) ; Parolin, Pia (autora) ; Parren, Marc (autor) ; Parthasarathy, Narayanaswamy (autor) ; Paudel, Ekananda (autora) ; Permana, Andrea (autora) ; Piedade, Maria T. F. (autora) ; Pitman, Nigel C. A. (autor) ; Poorter, Lourens (autor) ; Poulsen, Axel D. (autor) ; Poulsen, John (autor) ; Powers, Jennifer (autora) ; Prasad, Rama C. (autor) ; Puyravaud, Jean Philippe (autor) ; Razafimahaimodison, Jean Claude (autor) ; Reitsma, Jan (autor) ; Dos Santos, João Roberto (autor) ; Spironello, Wilson Roberto (autor) ; Romero Saltos, Hugo (autor) ; Rovero, Francesco (autor) ; Rozak, Andes Hamuraby (autor) ; Ruokolainen, Kalle (autor) ; Rutishauser, Ervan (autor) ; Saiter, Felipe (autor) ; Saner, Philippe (autor) ; Santos, Braulio A. (autor) ; Santos, Fernanda (autora) ; Sarker, Swapan Kumar (autor) ; Satdichanh, Manichanh (autora) ; Schmitt, Christine B. (autora) ; Schöngart, Jochen (autor) ; Schulze, Mark (autor) ; Suganuma, Marcio S. (autor) ; Sheil, Douglas (autor) ; da Silva Pinheiro, Eduardo (autor) ; Sist, Plinio (autor) ; Stevart, Tariq (autor) ; Sukumar, Raman (autor) ; Sun, I-Fang (autor) ; Sunderland, Terry (autor) ; Suresh, H. S. (autor) ; Suzuki, Eizi (autor) ; Tabarelli, Marcelo (autor) ; Tang, Jangwei (autor) ; Targhetta, Natália (autora) ; Theilade, Ida (autora) ; Thomas, Duncan W. (autor) ; Tchouto, Peguy (autor) ; Hurtado, Johanna (autora) ; Valencia, Renato (autor) ; van Valkenburg, Johan L. C. H. (autor) ; Van Do, Tran (autor) ; Vásquez, Rodolfo (autor) ; Verbeeck, Hans (autor) ; Adekunle, Victor (autor) ; Vieira, Simone A. (autor) ; Webb, Campbell O. (autor) ; Whitfeld, Timothy (autor) ; Wich, Serge A. (autor) ; Williams, John (autor) ; Wittmann, Florian (autor) ; Wöll, Hannsjoerg (autor) ; Yang, Xiaobo (autor) ; Adou Yao, C. Yves (autor) ; Yap, Sandra L. (autora) ; Yoneda, Tsuyoshi (autor) ; Rakan A Zahawi, Rakan A. (autor) ; Zakaria, Rahmad (autor) ; Zang, Runguo (autor) ; de Assis, Rafael L. (autor) ; García Luize, Bruno (autor) ; Venticinque, Eduardo M. (autor) ;
Contenido en: PNAS Vol. 112, no. 24 (June 2015), p. 7472–7477 ISSN: 1091-6490
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Resumen en: Inglés |
Resumen en inglés

The high species richness of tropical forests has long been recognized, yet there remains substantial uncertainty regarding the actual number of tropical tree species. Using a pantropical tree inventory database from closed canopy forests, consisting of 657,630 trees belonging to 11,371 species, we use a fitted value of Fisher's alpha and an approximate pantropical stem total to estimate the minimum number of tropical forest tree species to fall between ~ 40,000 and ~ 53,000, i.e., at the high end of previous estimates. Contrary to common assumption, the Indo-Pacific region was found to be as species-rich as the Neotropics, with both regions having a minimum of ~ 19,000-25,000 tree species. Continental Africa is relatively depauperate with a minimum of ~ 4,500-6,000 tree species. Very few species are shared among the African, American, and the Indo-Pacific regions. We provide a methodological framework for estimating species richness in trees that may help refine species richness estimates of tree-dependent taxa.