Linking reliance on deep soil water to resource economy strategies and abundance among coexisting understorey shrub species in subtropical pine plantations
Linking reliance on deep soil water to resource economy strategies and abundance among coexisting understorey shrub species in subtropical pine plantations
复制标题
将深层土壤水的依赖与亚热带松林共存林下灌木物种的资源经济战略和丰度联系起来
DOI：
10.1111/nph.16027
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发表时间：
2020
期刊：
影响因子：
9.4
通讯作者：
Fu Xiaoli
中科院分区：
文献类型：
--
作者：
Jiang Peipei;Wang Huimin;Meinzer Frederick C;Kou Liang;Dai Xiaoqin;Fu Xiaoli
深层土壤水分获取策略（WAdeep）是物种适应干旱的关键。本文以13种亚热带针叶林下灌木为研究对象，研究了林下灌木的WAdeep大小、WAdeep的季节可塑性、午间叶水势（WMD）、物种丰富度和资源经济性状。更高的WAdeep容量与更高的内在水分利用效率相关，但这不是在旱季保持较高的植被所必需的，也不是最常见的灌木物种所具有的普遍特征。WADeep季节可塑性高的树种木材密度较低，说明速生树种在深层土壤资源获取上具有较高的可塑性。然而，WADeep的大小和可塑性与浅细根经济性状无关，这表明土壤资源获取的深和浅土壤之间的独立维度。我们的研究结果提供了新的见解，通过WADeep的大小和可塑性与浅土壤和地上资源获取性状相互作用的机制，以整合整个植物的经济谱，从而，社区组装过程。
Strategies for deep soil water acquisition (WAdeep) are critical to a species’ adaptation to drought. However, it is unknown how WAdeepdetermines the abundance and resource economy strategies of understorey shrub species.With data from 13 understorey shrub species in subtropical coniferous plantations, we investigated associations between the magnitude of WAdeep, the seasonal plasticity of WAdeep, midday leaf water potential (Ψmd), species abundance and resource economic traits across organs.Higher capacity for WAdeepwas associated with higher intrinsic water use efficiency, but was not necessary for maintaining higher Ψmdin the dry season nor was it an ubiquitous trait possessed by the most common shrub species. Species with higher seasonal plasticity of WAdeephad lower wood density, indicating that fast species had higher plasticity in deep soil resource acquisition. However, the magnitude and plasticity of WAdeepwere not related to shallow fine root economy traits, suggesting independent dimensions of soil resource acquisition between deep and shallow soil.Our results provide new insights into the mechanisms through which the magnitude and plasticity of WAdeepinteract with shallow soil and aboveground resource acquisition traits to integrate the whole‐plant economic spectrum and, thus, community assembly processes.