Spatial dispersion patterns of trees in a tropical rainforest in Xishuangbanna, southwest China

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• 作者：Guoyu Lan (1) (2) (4)
  Hua Zhu (1)
  Min Cao (1)
  Yuehua Hu (1) (2)
  Hong Wang (1)
  Xiaobao Deng (1)
  Shishun Zhou (1)
  Jingyun Cui (1)
  Jianguo Huang (3)
  Youcai He (3)
  Linyun Liu (3)
  Hailong Xu (3)
  Junping Song (3)
  
• 关键词：Janzen–Connell effects ; Spatial distribution ; Species diversity ; Tropical rainforest ; Xishuangbanna
• 刊名：Ecological Research
• 出版年：2009
• 出版时间：September 2009
• 年：2009
• 卷：24
• 期：5
• 页码：1117-1124
• 全文大小：848KB
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• 作者单位：Guoyu Lan (1) (2) (4)
  Hua Zhu (1)
  Min Cao (1)
  Yuehua Hu (1) (2)
  Hong Wang (1)
  Xiaobao Deng (1)
  Shishun Zhou (1)
  Jingyun Cui (1)
  Jianguo Huang (3)
  Youcai He (3)
  Linyun Liu (3)
  Hailong Xu (3)
  Junping Song (3)
  
  1. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Xue Fu Road 88, Kunming, Yunnan, 650223, People’s Republic of China
  2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China
  4. Chinese Academy of Tropical Agricultural Sciences, Danzhou, Hainan, 571737, People’s Republic of China
  3. Xishuangbanna Administration of Nature Reserves, Jinghong, 666100, People’s Republic of China
  

文摘

Spatial dispersion patterns of trees at different life stages are an important aspect to investigate in understanding the mechanisms that facilitate species co-existence. In this paper, Ripley’s univariate L(r) and bivariate L 12(r) functions were used to analyze spatial distribution patterns and spatial associations across different life stages of 131 tree species in a 20-ha plot of a tropical rainforest in Xishuangbanna, southwest China. Our results show that: (1) Saplings of 109 (83.2%) species have a significant clumped distribution, which confirms the ubiquity of clumped spatial distributions among tropical tree species. (2) Adults of 126 (96.2%) species have a random distribution suggesting that density-dependent mortality can make the spatial pattern of tropical trees more regular with time. (3) At small scales (0-0?m), 95 (72.5%) species have a neutral or negative sapling-adult association, implying that there is recruitment limitation within the vicinity of their conspecific adults. The reduction in spatial clumping in going from younger to older life stages and the neutral or negative sapling-adult association imply density-dependent mortality in the vicinity of adult trees. In accordance with the Janzen–Connell hypothesis, such density-dependent mortality can free up space for other species to colonize, contributing to the maintenance of species diversity.