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2 resultados encontrados para: AUTOR: Leandro, Patricia
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1.
- Artículo con arbitraje
Resumen en: Inglés |
Resumen en inglés

In agroforestry systems, shade trees strongly affect the physiology of the undergrown crop. However, a major paradigm is that the reduction in absorbed photosynthetically active radiation is, to a certain extent, compensated by an increase in light-use efficiency, thereby reducing the difference in net primary productivity between shaded and non-shaded plants. Due to the large spatial heterogeneity in agroforestry systems and the lack of appropriate tools, the combined effects of such variables have seldom been analysed, even though they may help understand physiological processes underlying yield dynamics. In this study, we monitored net primary productivity, during two years, on scales ranging from individual coffee plants to the entire plot. Absorbed radiation was mapped with a 3D model (MAESPA). Light-use efficiency and net assimilation rate were derived for each coffee plant individually. We found that although irradiance was reduced by 60% below crowns of shade trees, coffee light-use efficiency increased by 50%, leaving net primary productivity fairly stable across all shade levels. Variability of aboveground net primary productivity of coffee plants was caused primarily by the age of the plants and by intraspecific competition among them (drivers usually overlooked in the agroforestry literature) rather than by the presence of shade trees.


2.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
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
Nota: Solicítelo con su bibliotecario/a
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.