Weemstra Monique, Mommer Liesje, Visser Eric J W, van Ruijven Jasper, Kuyper Thomas W, Mohren Godefridus M J, Sterck Frank J
Forest Ecology and Forest Management group, Wageningen University, 6700 AA, Wageningen, the Netherlands.
Plant Ecology and Nature Conservation group, Wageningen University, 6700 AA, Wageningen, the Netherlands.
New Phytol. 2016 Sep;211(4):1159-69. doi: 10.1111/nph.14003. Epub 2016 May 12.
Contents 1159 I. 1159 II. 1161 III. 1164 IV. 1166 1167 References 1167 SUMMARY: The search for a root economics spectrum (RES) has been sparked by recent interest in trait-based plant ecology. By analogy with the one-dimensional leaf economics spectrum (LES), fine-root traits are hypothesised to match leaf traits which are coordinated along one axis from resource acquisitive to conservative traits. However, our literature review and meta-level analysis reveal no consistent evidence of an RES mirroring an LES. Instead the RES appears to be multidimensional. We discuss three fundamental differences contributing to the discrepancy between these spectra. First, root traits are simultaneously constrained by various environmental drivers not necessarily related to resource uptake. Second, above- and belowground traits cannot be considered analogues, because they function differently and might not be related to resource uptake in a similar manner. Third, mycorrhizal interactions may offset selection for an RES. Understanding and explaining the belowground mechanisms and trade-offs that drive variation in root traits, resource acquisition and plant performance across species, thus requires a fundamentally different approach than applied aboveground. We therefore call for studies that can functionally incorporate the root traits involved in resource uptake, the complex soil environment and the various soil resource uptake mechanisms - particularly the mycorrhizal pathway - in a multidimensional root trait framework.
目录
1159 一、
1159 二、
1161 三、
1164 四、
1166 参考文献
1167 摘要：对根系经济学谱（RES）的探索源于近期对基于性状的植物生态学的兴趣。类比一维的叶片经济学谱（LES），细根性状被假设与叶片性状相匹配，这些叶片性状沿着从资源获取型到保守型性状的一个轴协调变化。然而，我们的文献综述和元分析表明，没有一致的证据显示RES反映了LES。相反，RES似乎是多维的。我们讨论了导致这些谱之间差异的三个根本差异。第一，根性状同时受到各种不一定与资源吸收相关的环境驱动因素的限制。第二，地上和地下性状不能被视为类似物，因为它们功能不同，可能与资源吸收的方式也不相似。第三，菌根相互作用可能抵消对RES的选择。因此，理解和解释驱动物种间根性状、资源获取和植物表现变化的地下机制和权衡，需要一种与地上应用的方法根本不同的方法。我们因此呼吁开展能够在多维根性状框架中，从功能上纳入参与资源吸收的根性状、复杂的土壤环境和各种土壤资源吸收机制——特别是菌根途径——的研究。
