Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 565507
Title Competition influences tree growth, but not mortality, across environmental gradients in Amazonia and tropical Africa
Author(s) Rozendaal, Danaë M.A.; Phillips, Oliver L.; Lewis, Simon L.; Affum-Baffoe, Kofi; Alvarez-Davila, Esteban; Andrade, Ana; Aragão, Luiz E.O.C.; Araujo-Murakami, Alejandro; Baker, Timothy R.; Bánki, Olaf; Brienen, Roel J.W.; Camargo, José Luis C.; Comiskey, James A.; Djuikouo Kamdem, Marie Noël; Fauset, Sophie; Feldpausch, Ted R.; Killeen, Timothy J.; Laurance, William F.; Laurance, Susan G.W.; Lovejoy, Thomas; Malhi, Yadvinder; Marimon, Beatriz S.; Marimon Junior, Ben Hur; Marshall, Andrew R.; Neill, David A.; Núñez Vargas, Percy; Pitman, Nigel C.A.; Poorter, Lourens; Reitsma, Jan; Silveira, Marcos; Sonké, Bonaventure; Sunderland, Terry; Taedoumg, Hermann; Steege, Hans ter; Terborgh, John W.; Umetsu, Ricardo K.; Heijden, Geertje M.F. van der; Vilanova, Emilio; Vos, Vincent; White, Lee J.T.; Willcock, Simon; Zemagho, Lise; Vanderwel, Mark C.
Source Ecology 101 (2020)7. - ISSN 0012-9658
Department(s) PE&RC
Laboratory of Geo-information Science and Remote Sensing
Forest Ecology and Forest Management
Publication type Refereed Article in a scientific journal
Publication year 2020
Keyword(s) climatic water deficit - competition - forest dynamics - mortality - neighborhood effects - soil fertility - trait-based models - tree growth - tropical forest - wood density

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.

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