Procedure for separating the selection effect from other effects in diversity–productivity relationship
Procedure for separating the selection effect from other effects in diversity–productivity relationship
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DOI：
10.1046/j.1461-0248.2001.00277.x
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发表时间：
2001-11
期刊：
影响因子：
8.8
通讯作者：
Iva Špaèková;J. Lepš
中科院分区：
文献类型：
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作者：
Iva Špaèková;J. Lepš
在温室盆栽试验中，我们以替代系列设计培育了6个草甸品种。在单一栽培和所有可能的物种组合中，这些植物在两种播种密度下种植。我们的目标是将选择效应与其他多样性效应分开。这种区别是基于这样一个概念，即真正的过度屈服并不是选择效应的结果。我们建议一种分级程序，这种程序的基础是将样本反复划分为最具生产力的物种存在和缺失的盆栽。然后，在产量最高的物种子集中，生产力与物种丰富度的正相关性可以证明超产。尽管我们在整个数据集中发现生物量与物种丰富度有很强的相关性，但分层方法没有显示出过度屈服的证据。单一栽培中的地上生物量是物种混合中物种成功的良好预测因子。
In a greenhouse pot experiment we cultivated six meadow species in a replacement series design. The plants were grown at two sowing densities in monocultures and all possible species combinations. Our aim was to separate the selection effect from other diversity effects. This distinction is based on the notion that true overyielding is not a consequence of the selection effect. We suggest a hierarchical procedure, which is based on a repeated division of samples into the pots with the most productive species present and missing. Overyielding can be then demonstrated by a positive dependence of productivity on species richness in the subsets with the most productive species present. Although we found a strong dependence of biomass on species richness in the entire data set, the hierarchical method revealed no evidence of overyielding. Above-ground biomass in a monoculture was a good predictor of species success in a species mix.