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Climate seasonality limits leaf carbon assimilation and wood productivity in tropical forests

2016; Copernicus Publications; Volume: 13; Issue: 8 Linguagem: Inglês

10.5194/bg-13-2537-2016

1726-4189

Fabien Wagner, Bruno Hérault, Damien Bonal, Clément Stahl, Liana O. Anderson, Timothy R. Baker, Gabriel Sebastian Becker, Hans Beeckman, Danilo Boanerges Souza, Paulo César Botosso, David M. J. S. Bowman, Achim Bräuning, Benjamin Brede, Foster Irving Brown, J. Julio Camarero, Plínio Barbosa de Camargo, Fernanda C. G. Cardoso, Fabrício Alvim Carvalho, Wendeson Castro, Rubens Koloski Chagas, Jérôme Chave, Emmanuel N. Chidumayo, Deborah A. Clark, Flávia R. C. Costa, Camille Couralet, Paulo Henrique da Silva Mauricio, Helmut Dalitz, Vinícius Resende de Castro, Jaçanan Eloísa de Freitas Milani, Edilson Consuelo de Oliveira, Luciano de Souza Arruda, Jean-Louis Devineau, David M. Drew, Oliver Dünisch, Giselda Durigan, Elisha Elifuraha, Marcio Fedele, Ligia Ferreira Fedele, Afonso Figueiredo Filho, César Augusto Guimarães Finger, Augusto C. Franco, João Lima Freitas Júnior, Franklin Galvão, Aster Gebrekirstos, Robert Gliniars, Paulo Maurı́cio Lima de Alencastro Graça, Anthony D. Griffiths, James Grogan, Kaiyu Guan, Jürgen Homeier, Maria Raquel Kanieski, Lip Khoon Kho, Jennifer Koenig, Síntia Valério Kohler, Julia Krepkowski, José Pires de Lemos-Filho, Diana Lieberman, Milton Lieberman, Cláudio Sérgio Lisi, Tomaz Longhi-Santos, José Luis López Ayala, Eduardo Eiji Maeda, Yadvinder Malhi, Vivian R. B. Maria, Márcia C. M. Marques, Renato Marques, Hector Maza Maza Chamba, Lawrence Mbwambo, Karina Melgaço, Hooz A. Mendivelso, Brett P. Murphy, Joseph J. O’Brien, Steven F. Oberbauer, Naoki Okada, Raphaël Pélissier, Lynda D. Prior, Fidel A. Roig, Michael S. Ross, Davi Rodrigo Rossatto, Vivien Rossi, Lucy Rowland, Ervan Rutishauser, Hellen Santana, Mark Schulze, Diogo Selhorst, Williamar Rodrigues Silva, Marcos Silveira, Susanne Spannl, Michael Swaine, José Júlio de Toledo, Marcos Miranda Toledo, Marisol Toledo, Takeshi Toma, Mário Tomazello Filho, Juan Ignacio Valdéz Hernández, Jan Verbesselt, Simone Aparecida Vieira, Grégoire Vincent, Carolina V. Castilho, Franziska Volland, Martin Worbes, Magda Léa Bolzan Zanon, Luiz E. O. C. Aragão,

Remote Sensing in Agriculture

Abstract. The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associated canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000 mm yr−1 (water-limited forests) and to radiation otherwise (light-limited forests). On the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration, respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. First-order control by precipitation likely indicates a decrease in tropical forest productivity in a drier climate in water-limited forest, and in current light-limited forest with future rainfall < 2000 mm yr−1.