Seed rain,soil seed bank,seed loss and regeneration of Castanopsis fargesii (Fagaceae) in a subtropical evergreen broad-leaved forest |
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| Affiliation: | 1. Laboratory of Quantitative Vegetation Ecology, Institute of Botany, The Chinese Academy of Sciences, 20 Nanxincun, Xiangshan, Beijing 100093, China;2. U.S. Geological Survey, Jamestown, ND 58401, USA;1. Graduate Program in Plant Biology, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235 – Cidade Universitária, Recife CEP 50670-901, PE, Brazil;2. Department of Biology, University of Vermont, 109 Carrigan Drive, 120A Marsh Life Science Bld., Burlington, VT 05405, United States;3. Biological Dynamics of Forest Fragments Project, National Institute for Amazonian Research/Smithsonian Tropical Research Institute, Caixa Postal 478, 69011-970 Manaus, AM, Brazil;1. Department of Ecology, School of Life Sciences, Nanjing University, Nanjing 210093, China;2. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;1. UFZ, Helmholtz Centre for Environmental Research – UFZ, Department of Ecological Modelling, Permoserstr. 15, 04318 Leipzig, Germany;2. Área de Ecología., Dpto. Biología de Organismos y Sistemas de la Universidad de Oviedo, C/Valentín Andrés Álvarez s/n, E33071 Oviedo, Spain;3. Research Unit of Biodiversity (CSIC, UO, PA), University of Oviedo, 33071 Oviedo, Spain;1. Key Laboratory for Forest Resources & Ecosystem Processes of Beijing, Beijing Forestry University, Beijing 100083, China;2. Faculty of Forestry and Forest Ecology, Georg-August-University Göttingen, Büsgenweg 5, D-37077 Göttingen, Germany |
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| Abstract: | Understanding the seed rain and seed loss dynamics in the natural condition has important significance for revealing the natural regeneration mechanisms. We conducted a 3-year field observation on seed rain, seed loss and natural regeneration of Castanopsis fargesii Franch., a dominant tree species in evergreen broad-leaved forests in Dujiangyan, southwestern China. The results showed that: (1) there were marked differences in (mature) seed production between mast (733,700 seeds in 2001) and regular (51,200 and 195,600 seeds in 2002 and 2003, respectively) years for C. fargesii. (2) Most seeds were dispersed in leaf litter, humus and 0–2 cm depth soil in seed bank. (3) Frequency distributions of both DBH and height indicated that C. fargesii had a relatively stable population. (4) Seed rain, seed ground density, seed loss, and leaf fall were highly dynamic and certain quantity of seeds were preserved on the ground for a prolonged time due to predator satiation in both the mast and regular years so that the continuous presence of seed bank and seedling recruitments in situ became possible. Both longer time observations and manipulative experiments should be carried out to better understand the roles of seed dispersal and regeneration process in the ecosystem performance. |
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