Dynamics, productivity and species richness of tropical rainforests along elevational and edaphic gradients on Mount Kinabalu, Borneo
Dynamics, productivity and species richness of tropical rainforests along elevational and edaphic gradients on Mount Kinabalu, Borneo
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DOI：
10.1007/s11284-005-0043-z
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发表时间：
2005-05-01
影响因子：
2
通讯作者：
Kitayama, K
中科院分区：
文献类型：
--
作者：
Aiba, S;Takyu, M;Kitayama, K
研究了婆罗洲基纳巴卢山（Mount Kinabalu） 4个海拔高度（700、1700、2700和3100英寸）的9个热带雨林在8年（1995-2003）的不同地理条件下的动态变化。并研究了它们与地上生产力的关系。9种林分在各时期的茎粗平均生长率、基面积周转率和估计增补率（利用生长率和大小分布）与生产力相关。这些以存活茎的生长率为基础的速率似乎是林分更替的良好指标。然而，在某些时期，根据对新兵和死亡率的直接观察观察到的征聘率和死亡率（以及作为这些死亡率平均值的离职率）与生产力并不相关。由于样本量小，普查间隔短，这些比率受随机波动的影响很大，因此可能不能作为林分更替的衡量指标。与1997-1998年厄尔尼诺事件有关的严重干旱使死亡率升高，使平均生长率、增收率和基本面积周转率降低，但对这些比率（死亡率除外）与生产力之间的相关性几乎没有影响。在基纳巴卢山不同的海拔和地形梯度上，森林周转、生产力和物种丰富度相互相关，但由于不同海拔森林的不同历史和物种库，其因果关系难以解释。
We studied the dynamics of nine tropical rainforests on Mount Kinabalu, Borneo, at four elevations (700, 1,700, 2,700 and 3,100 in) on various edaphic conditions for four 2-year periods over 8 years (1995-2003). and examined the relationships with above-ground productivity. Mean growth rate of stem diameter, basal area turnover rate and estimated recruitment rate (using growth rate and size distribution) correlated with productivity among the nine forests in all periods. These rates based on growth rates of surviving stems appeared to be good measures of stand turnover. However, observed recruitment rate and mortality (and turnover rate as mean of these rates) based on direct observation of recruits and deaths did not correlate with productivity in some periods. These rates may not be useful as measures of stand turnover given small sample size and short census interval because they were highly influenced by stochastic fluctuation. A severe drought associated with the 1997-1998 El Nino event inflated mortality and depressed mean growth rate, recruitment rate and basal area turnover rate, but had little effect on the correlations between these rates (except mortality) and productivity. Across broad elevational and edaphic gradients on Mount Kinabalu, forest turnover, productivity and species richness correlated with each other, but the causal interpretation is difficult given the different histories and species pools among forests at different elevations.