物种多样性与生态系统功能时间变异性的关系研究进展

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Abstract

The effect of species diversity on temporal variability of ecosystem function has recently emerged as a topic of considerable ecological interests due to the increadsing species extinction in recent decades. In this paper, the theoretical and empirical studies on the relationships and underlying mechanisms between species diversity and temporal variability in community structure were reviewed. First, Theoretical studies predict that community variability should decline with increasing species diversity, and the underlying mechanisms include:sampling effect, resource-use segregation effect, statistical averaging effect, insurance effect, evenness effect in population variability. Many, but not all, empirical studies support these expectations. However, there are no clear interpretations to the differences of conclusions about diversity-variability relationship drawn from each experiment. Second, studies that test the effect of species diversity on temporal variability in population property were also summarized. Theoretical studies suggest that the relationship between species diversity and population variability depends primarily on the mean-variance rescaling coefficient Z; in most natural communities, population variability should theoretically increase with species diversity;However, some studies show that species diversity has stable effect on population level of individual component species in varied environment. But empirical studies still cannot show a clear pattern of the effect species diversity on population variability. Last, we discussed several aspects of the disadvantages that exist in current theoretical and empirical studies and hope that this paper could be a synthetically consultation to further researches.

Key words： Species diversity Variability in population property Variability in community aggregate property

Received: 25 April 2005

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	QIN Guang-lian
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QIN Guang-lian,DU Guo-zhen. Effect of species diversity on temporal variability of ecosystem function[J]. , 2005, 24(2): 158-161.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2005/V24/I2/158

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