Demographic Drivers of Aboveground Biomass Dynamics During Secondary Succession in Neotropical Dry and Wet Forests |
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| Authors: | Danaë M. A. Rozendaal Robin L. Chazdon Felipe Arreola-Villa Patricia Balvanera Tony V. Bentos Juan M. Dupuy J. Luis Hernández-Stefanoni Catarina C. Jakovac Edwin E. Lebrija-Trejos Madelon Lohbeck Miguel Martínez-Ramos Paulo E. S. Massoca Jorge A. Meave Rita C. G. Mesquita Francisco Mora Eduardo A. Pérez-García I. Eunice Romero-Pérez Irving Saenz-Pedroza Michiel van Breugel G. Bruce Williamson Frans Bongers |
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| Affiliation: | 1.Department of Ecology and Evolutionary Biology,University of Connecticut,Storrs,USA;2.Forest Ecology and Forest Management Group,Wageningen University,Wageningen,The Netherlands;3.International Institute for Sustainability,Rio de Janeiro,Brazil;4.Department of Ecology and Evolutionary Biology,University of Colorado,Boulder,USA;5.Instituto de Investigaciones en Ecosistemas y Sustentabilidad,Universidad Nacional Autónoma de México,Morelia,Mexico;6.Biological Dynamics of Forest Fragments Project, Coordena??o de Dinamica Ambiental,Instituto Nacional de Pesquisas da Amaz?nia,Manaus,Brazil;7.Unidad de Recursos Naturales,Centro de Investigación Científica de Yucatán (CICY),Mérida,Mexico;8.Smithsonian ForestGEO,Smithsonian Tropical Research Institute,Balboa,Panama;9.Department of Biology and the Environment, Faculty of Natural Sciences,University of Haifa-Oranim,Tivon,Israel;10.World Agroforestry Centre,Nairobi,Kenya;11.Departamento de Ecología y Recursos Naturales, Facultad de Ciencias,Universidad Nacional Autónoma de México,Ciudad de México,Mexico;12.Yale-NUS College,Singapore,Singapore;13.Department of Biological Sciences,National University of Singapore,Singapore,Singapore;14.Department of Biological Sciences,Louisiana State University,Baton Rouge,USA;15.Department of Biology,University of Regina,Regina,Canada |
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| Abstract: | The magnitude of the carbon sink in second-growth forests is expected to vary with successional biomass dynamics resulting from tree growth, recruitment, and mortality, and with the effects of climate on these dynamics. We compare aboveground biomass dynamics of dry and wet Neotropical forests, based on monitoring data gathered over 3–16 years in forests covering the first 25 years of succession. We estimated standing biomass, annual biomass change, and contributions of tree growth, recruitment, and mortality. We also evaluated tree species’ contributions to biomass dynamics. Absolute rates of biomass change were lower in dry forests, 2.3 and 1.9 Mg ha?1 y?1, after 5–15 and 15–25 years after abandonment, respectively, than in wet forests, with 4.7 and 6.1 Mg ha?1 y?1, in the same age classes. Biomass change was largely driven by tree growth, accounting for at least 48% of biomass change across forest types and age classes. Mortality also contributed strongly to biomass change in wet forests of 5–15 years, whereas its contribution became important later in succession in dry forests. Biomass dynamics tended to be dominated by fewer species in early-successional dry than wet forests, but dominance was strong in both forest types. Overall, our results indicate that biomass dynamics during succession are faster in Neotropical wet than dry forests, with high tree mortality earlier in succession in the wet forests. Long-term monitoring of second-growth tropical forest plots is crucial for improving estimates of annual biomass change, and for enhancing understanding of the underlying mechanisms and demographic drivers. |
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