Competition influences tree growth, but not mortality, across environmental gradients in Amazonia and tropical Africa

Autor: Emilio Vilanova, Percy Núñez Vargas, John Terborgh, Jan Reitsma, Ricardo Keichi Umetsu, Bonaventure Sonké, Danaë M. A. Rozendaal, Olaf Bánki, Timothy R. Baker, Nigel C. A. Pitman, Ben Hur Marimon Junior, Susan G. Laurance, Marcos Silveira, Mark C. Vanderwel, William F. Laurance, Andrew R. Marshall, Oliver L. Phillips, Sophie Fauset, Luiz E. O. C. Aragão, Yadvinder Malhi, José Luís Camargo, Terry Sunderland, Ted R. Feldpausch, Lourens Poorter, Marie Noel Djuikouo Kamdem, Hermann Taedoumg, Beatriz Schwantes Marimon, David A. Neill, Timothy J. Killeen, James A. Comiskey, Alejandro Araujo-Murakami, Vincent A. Vos, Roel J. W. Brienen, Simon L. Lewis, Esteban Álvarez-Dávila, Lise Zemagho, Kofi Affum-Baffoe, Geertje M. F. van der Heijden, Lee J. T. White, Ana Andrade, Thomas E. Lovejoy, Hans ter Steege, Simon Willcock
Přispěvatelé: Systems Ecology
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Ecology
Ecology 101 (2020) 7
Rozendaal, D M A, Phillips, O L, Lewis, S L, Affum-Baffoe, K, Alvarez-Davila, E, Andrade, A, Aragão, L E O C, Araujo-Murakami, A, Baker, T R, Bánki, O, Brienen, R J W, Camargo, J L C, Comiskey, J A, Djuikouo Kamdem, M N, Fauset, S, Feldpausch, T R, Killeen, T J, Laurance, W F, Laurance, S G W, Lovejoy, T, Malhi, Y, Marimon, B S, Marimon Junior, B H, Marshall, A R, Neill, D A, Núñez Vargas, P, Pitman, N C A, Poorter, L, Reitsma, J, Silveira, M, Sonké, B, Sunderland, T, Taedoumg, H, ter Steege, H, Terborgh, J W, Umetsu, R K, van der Heijden, G M F, Vilanova, E, Vos, V, White, L J T, Willcock, S, Zemagho, L & Vanderwel, M C 2020, ' Competition influences tree growth, but not mortality, across environmental gradients in Amazonia and tropical Africa ', Ecology, vol. 101, no. 7, e03052, pp. 1-11 . https://doi.org/10.1002/ecy.3052
Repositório Institucional do INPA
Instituto Nacional de Pesquisas da Amazônia (INPA)
instacron:INPA
Ecology, 101(7)
Ecology, 101(7):e03052, 1-11. Ecological Society of America
ISSN: 0012-9658
DOI: 10.1002/ecy.3052
Popis: Competition among trees is an important driver of community structure and dynamics in tropical forests. Neighboring trees may impact an individual tree’s growth rate and probability of mortality, but large-scale geographic and environmental variation in these competitive effects has yet to be evaluated across the tropical forest biome. We quantified effects of competition on tree-level basal area growth and mortality for trees ≥10-cm diameter across 151 ~1-ha plots in mature tropical forests in Amazonia and tropical Africa by developing nonlinear models that accounted for wood density, tree size, and neighborhood crowding. Using these models, we assessed how water availability (i.e., climatic water deficit) and soil fertility influenced the predicted plot-level strength of competition (i.e., the extent to which growth is reduced, or mortality is increased, by competition across all individual trees). On both continents, tree basal area growth decreased with wood density and increased with tree size. Growth decreased with neighborhood crowding, which suggests that competition is important. Tree mortality decreased with wood density and generally increased with tree size, but was apparently unaffected by neighborhood crowding. Across plots, variation in the plot-level strength of competition was most strongly related to plot basal area (i.e., the sum of the basal area of all trees in a plot), with greater reductions in growth occurring in forests with high basal area, but in Amazonia, the strength of competition also varied with plot-level wood density. In Amazonia, the strength of competition increased with water availability because of the greater basal area of wetter forests, but was only weakly related to soil fertility. In Africa, competition was weakly related to soil fertility and invariant across the shorter water availability gradient. Overall, our results suggest that competition influences the structure and dynamics of tropical forests primarily through effects on individual tree growth rather than mortality and that the strength of competition largely depends on environment-mediated variation in basal area. © 2020 The Authors. Ecology published by Wiley Periodicals LLC on behalf of Ecological Society of America
Databáze: OpenAIRE
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