期刊
JOURNAL OF TROPICAL ECOLOGY
卷 25, 期 -, 页码 429-437出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0266467409006130
关键词
seed germination; seedling establishment; seedling growth; species coexistence; treefall gap; wood
类别
资金
- Smithsonian Tropical Research Institute (STRI)
- National Science Foundation [0342925]
- Direct For Biological Sciences
- Division Of Environmental Biology [0342925] Funding Source: National Science Foundation
- Direct For Biological Sciences
- Emerging Frontiers [752017] Funding Source: National Science Foundation
Fallen tree trunks ('nurse logs') are important recruitment sites for trees in temperate forest, however nurse log use is seldom reported in tropical forests. We predicted that logs should be important for the regeneration of small-seeded tropical pioneer species because surface leaf litter and competition with established vegetation reduces the establishment success of these species from soil seed banks. In a survey oil Barre, Colorado Island, Panama, we found that pioneer seedlings were present oil logs in 40 of 95 recent treefall gaps. In gaps where seedlings were present oil logs, seedling density was not significantly different from adjacent areas of soil. However, species composition was significantly different: logs were disproportionately colonized by smaller-seeded and wind-dispersed species. In growing-house experiments using 1.2 species. we found that wood substrate had little effect: oil seed germination. In contrast, seedling growth was 50%, lower on decayed wood than soil. Furthermore, species growth rates on wood were not significantly correlated with growth rates in soil (df = 10, r = 0.48). If establishment on logs eventually leads to recruitment to the forest canopy, then logs may promote the maintenance of diversity by favouring a different group of species from those that recruit in Soil.
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