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Tropical tree growth driven by dry-season climate variability

2022; Nature Portfolio; Volume: 15; Issue: 4 Linguagem: Inglês

10.1038/s41561-022-00911-8

1752-0908

Pieter A. Zuidema, Flurin Babst, Peter Groenendijk, Valérie Trouet, Abrham Abiyu, Rodolfo Acuña-Soto, Eduardo Adenesky Filho, Raquel Alfaro‐Sánchez, José Roberto Vieira Aragão, Gabriel Assis-Pereira, Xue Bai, Ana Carolina Maioli Campos Barbosa, Giovanna Battipaglia, Hans Beeckman, Paulo César Botosso, Timothy J. Bradley, Achim Bräuning, Roel Brienen, Brendan M. Buckley, J. Julio Camarero, Ana Carvalho, Gregório Ceccantini, Librado R. Centeno-Erguera, Julián Cerano‐Paredes, Álvaro Agustín Chávez-Durán, Bruno Barçante Ladvocat Cintra, Malcolm K. Cleaveland, Camille Couralet, Rosanne D’Arrigo, Jorge I. del Valle, Oliver Dünisch, Brian J. Enquist, Karin Esemann‐Quadros, Zewdu Eshetu, Ze‐Xin Fan, M. Eugenia Ferrero, Esther Fichtler, Cláudia Fontana, Kainana S. Francisco, Aster Gebrekirstos, Emanuel Gloor, Daniela Granato‐Souza, Kristof Haneca, Grant L. Harley, Ingo Heinrich, Gerhard Helle, Janet G. Inga, Mahmuda Islam, Yumei Jiang, Mark Kaib, Zakia Hassan Khamisi, Marcin Koprowski, Bart Kruijt, Eva Layme, Rik Leemans, A. Joshua Leffler, Cláudio Sérgio Lisi, Neil J. Loader, Giuliano Maselli Locosselli, Lidio López, María I. López-Hernández, José Lousada, Hooz A. Mendivelso, Mulugeta Mokria, Valdinez Ribeiro Montóia, Eddy Moors, Cristina Nabais, Justine Ngoma, Francisco de Carvalho Nogueira Júnior, Juliano Morales de Oliveira, Gabriela Morais Olmedo, Mariana Alves Pagotto, Shankar Panthi, Gonzalo Pérez‐de‐Lis, Darwin Pucha-Cofrep, Nathsuda Pumijumnong, Mizanur Rahman, Jorge A. Ramírez, Edilson J. Requena‐Rojas, Adauto de Souza Ribeiro, Iain Robertson, Fidel A. Roig, Ernesto A. Rubio-Camacho, Ute Sass‐Klaassen, Jochen Schöngart, Paul R. Sheppard, Franziska Slotta, James H. Speer‬, Matthew D. Therrell, Benjamin Toirambe, Mário Tomazello Filho, Max C. A. Torbenson, Ramzi Touchan, Alejandro Venegas‐González, Ricardo Villalba, José Villanueva Díaz, Royd Vinya, Mart Vlam, Tommy H. G. Wils, Zhe‐Kun Zhou,

Climate variability and models

Interannual variability in the global land carbon sink is strongly related to variations in tropical temperature and rainfall. This association suggests an important role for moisture-driven fluctuations in tropical vegetation productivity, but empirical evidence to quantify the responsible ecological processes is missing. Such evidence can be obtained from tree-ring data that quantify variability in a major vegetation productivity component: woody biomass growth. Here we compile a pantropical tree-ring network to show that annual woody biomass growth increases primarily with dry-season precipitation and decreases with dry-season maximum temperature. The strength of these dry-season climate responses varies among sites, as reflected in four robust and distinct climate response groups of tropical tree growth derived from clustering. Using cluster and regression analyses, we find that dry-season climate responses are amplified in regions that are drier, hotter and more climatically variable. These amplification patterns suggest that projected global warming will probably aggravate drought-induced declines in annual tropical vegetation productivity. Our study reveals a previously underappreciated role of dry-season climate variability in driving the dynamics of tropical vegetation productivity and consequently in influencing the land carbon sink. Dry-season climate variability is a primary driver of tropical tree growth, according to observations from a pantropical tree-ring network.