Species diversity and productivity: why do results of diversity-manipulation experiments differ from natural patterns?
Species diversity and productivity: why do results of diversity-manipulation experiments differ from natural patterns?
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DOI：
10.1111/j.1365-2745.2009.01503.x
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发表时间：
2009-07-01
影响因子：
5.5
通讯作者：
Li, Linghao
中科院分区：
文献类型：
--
作者：
Jiang, Lin;Wan, Shiqiang;Li, Linghao
1.直接操纵物种多样性的实验往往报告了对生产力的正向多样性影响，而对自然群落的观察揭示了不同的生产力-多样性关系，而向自然植物群落添加养分通常会导致负的生产力-多样性关系。我们假设，这种明显的悖论可能可以通过互补性和正向选择效应的作用减少，以及与多样性操纵实验相比，自然群落中竞争排除的重要性增加来解释。这一假说源于多样性操纵实验中未成熟的人工组合群落与较成熟的自然群落在物种分布和丰度格局上的差异。我们的假设最适用于同质生境中的小规模研究，并补充了环境异质性假说，该假说解释了异质生境中的多样性-生产力模式。综合。我们的分析强调了人工群落在多样性操纵实验中与自然群落之间的重要差异，这可能会转化为不同的多样性生产力模式，并告诫不要将多样性操纵实验的结果不加区别地外推到自然群落。
1. Experiments that directly manipulate species diversity often report a positive diversity effect on productivity, whereas observations of natural communities reveal various productivity-diversity relationships and nutrient addition to natural plant communities generally results in negative productivity-diversity relationships.2. We hypothesize that this apparent paradox may be potentially explained by the reduced roles of complementarity and positive selection effects, and the increased importance of competitive exclusion in natural communities compared to diversity-manipulation experiments. This hypothesis arises from the difference in species distribution and abundance patterns between immature synthetically assembled communities in diversity-manipulation experiments and more mature natural communities.3. Our hypothesis applies best to small-scale studies within homogenous habitats and complements the environmental heterogeneity hypothesis that explains diversity-productivity patterns across heterogeneous habitats.4. Synthesis. Our analysis highlights important differences between synthetic communities in diversity-manipulation experiments and natural communities that may translate into different diversity-productivity patterns, and cautions against indiscriminate extrapolations of results of diversity-manipulation experiments to natural communities.