Root traits and plasticity differences explain complementarity between co-existing species in phosphorus-limited grassland
Root traits and plasticity differences explain complementarity between co-existing species in phosphorus-limited grassland
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DOI：
10.1007/s11104-024-06540-x
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发表时间：
2024-02
期刊：
影响因子：
4.9
通讯作者：
Hui Ji;Na Zhou;Z. Rengel;Jingying Jing;Hongbo Li
中科院分区：
文献类型：
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作者：
Hui Ji;Na Zhou;Z. Rengel;Jingying Jing;Hongbo Li
背景与目的互补效应和选择效应在多样性-生产力关系中起着重要作用。功能性状的多样性对物种间的互补性有重要影响。然而，哪些根系功能性状在解释生物量生产中起核心作用，以及环境变化引起的性状可塑性变化是否影响种间互补效应，仍有待探讨。方法采用单种栽培和两种混合栽培的温室环境，在不同的资源采集策略下，研究了4种温带草原物种的3个叶片和10个根系性状与磷获取有关，两种环境分别为磷限制环境（c6h6na12o24p6或KH2PO4）和磷充足环境（KH2PO4为200 mg P kg - 1）。结果大多数混合群落具有显著的净生物多样性和互补效应，且在不同的物种组合和磷供应上存在差异。在两个限磷处理中，单根性状（根体积、根直径、根冠比或酸性磷酸酶或有机酸阴离子分泌量）的功能分散和单根性状（根长、根体积、根表面积或有机酸阴离子分泌量）的可塑性差异解释了互补效应的变化。然而，无论磷供应多少，13个性状及其可塑性的多性状空间差异与互补效应无关。结论物种间根系关键性状和可塑性的差异在植物互补效应中起着重要作用。
Background and AimsThe complementarity and selection effects are important in the diversity-productivity relationship. The diversity of functional traits among species has an important effect on complementarity. However, it remains to be explored which root functional traits play a central role in explaining biomass production and whether the variation in trait plasticity caused by environmental changes affects the interspecific complementarity effects.MethodsWe characterized three leaf and 10 root traits related to P acquisition in four temperate grassland species with various resource foraging strategies in a study featuring monocultures and two-species mixtures in a greenhouse with two P-limited (20 mg P kg−1soil as C6H6Na12O24P6or KH2PO4) and one P-adequate (200 mg P kg−1soil as KH2PO4) environments.ResultsMajority of mixed communities produced significant net biodiversity and complementarity effects that varied among species combinations and P supplies. In the two P-limited treatments, the functional dispersion of single root traits (root volume, root diameter, root:shoot ratio, or exudation of acid phosphatase or organic acid anions) and plasticity difference in single traits (root length, root volume, root surface area, or exudation of organic acid anions) among the species explained the variation in the complementarity effect. However, the difference in the multi-trait space based on all 13 traits and their plasticity had no correlation with the complementarity effect regardless of P supply.ConclusionOur results suggested that differences in key root traits and plasticity among species played an important role in driving complementarity effects between plant species.