Community dynamics over 14 years along gradients of geological substrate and topography in tropical montane forests on Mount Kinabalu, Borneo
Community dynamics over 14 years along gradients of geological substrate and topography in tropical montane forests on Mount Kinabalu, Borneo
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DOI：
10.1017/s0266467414000777
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发表时间：
2015-02
影响因子：
1.4
通讯作者：
Yoshimi Sawada;Shin‐ichiro Aiba;Masaaki Takyu;R. Repin;J. Nais;K. Kitayama
中科院分区：
文献类型：
--
作者：
Yoshimi Sawada;Shin‐ichiro Aiba;Masaaki Takyu;R. Repin;J. Nais;K. Kitayama
摘要：了解热带山地森林群落动态沿着土壤肥力、树木死亡、补充和生长梯度的变化（≥5 cm直径）监测超过14年（1997-2011年），在三种地质基质类型的矩阵中放置了九个地块（第四纪沉积物，第三纪沉积岩和超基性岩）和三个地形单元（山脊，中坡和低坡）的神山，婆罗洲。样地面积为0.05公顷的山脊，0.1公顷的中坡和0.2公顷（超基性岩）和1公顷（其他基板）的低坡。招募率并没有显示出一致的模式在地质基质或地形。1997-1999年期间，包括厄尔尼诺干旱期间，几乎所有地块的死亡率都相对较高，2001-2005年期间，超基性岩上的三个地块的死亡率也相对较高。二项逻辑回归分析表明，1997-1999年期间死亡率随着土壤肥力（可溶性磷）的增加而增加。背景死亡率，不包括这些时期，没有不同的地质基质或地形。1997-2011年期间的平均增长率在较肥沃的土壤上较高，并与1997-1999年期间的死亡率呈正相关。我们认为，在干旱期间的高死亡率与更肥沃的土壤上的高物种多样性有关，而较低的增长率则与较差土壤上的发育不良结构有关。
Abstract: To understand the variation in community dynamics of tropical montane forests along gradients of soil fertility, death, recruitment and growth of trees (≥5 cm diameter) were monitored over 14 y (1997–2011) in nine plots placed in a matrix of three geological substrate types (Quaternary sediments, Tertiary sedimentary rocks and ultrabasic rocks) and three topographical units (ridge, middle and lower slopes) on Mount Kinabalu, Borneo. The plot area was 0.05 ha for ridge, 0.1 ha for middle slope and 0.2 ha (on ultrabasic rocks) and 1 ha (on the other substrates) for lower slope. Recruitment rates did not show a consistent pattern across geological substrates or topographies. Mortality rates were relatively high in almost all plots during the 1997–1999 period, including the El Niño drought, and in three plots on ultrabasic rocks during 2001–2005. Binomial logistic regression analyses showed that mortality during 1997–1999 increased with soil fertility (soluble phosphorus). Background mortality, excluding these periods, did not differ across geological substrates or topographies. The average growth rate during 1997–2011 was higher on more fertile soils and positively correlated with mortality during 1997–1999. We suggest that a high mortality rate during the drought period was related to high species diversity on more fertile soils, whereas a lower growth rate was related to stunted structures on poorer soils.