Costs of acquiring phosphorus by vascular land plants: patterns and implications for plant coexistence.
Costs of acquiring phosphorus by vascular land plants: patterns and implications for plant coexistence.
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DOI：
10.1111/nph.14967
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发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
J. Raven;H. Lambers;Sarah E. Smith;M. Westoby
中科院分区：
文献类型：
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作者：
J. Raven;H. Lambers;Sarah E. Smith;M. Westoby
内容摘要1420 I.导言. 1421根适应影响P的收购1422 III。采购P的成本：一般1423 IV.与土壤磷浓度无关的磷获取成本1423 V.随着土壤磷浓度下降而增加的磷获取成本1424 VI.讨论和结论1424致谢1425参考文献1425总结：我们比较了维管陆地植物获取磷（P）的不同模式的碳（因此是能量）成本。磷的获取模式被认为是植物与它们的根共生体和结构（如参与动员或吸收P的簇根）一起的机制。所考虑的磷源是可溶性和不溶性无机和有机库。成本包括运行P-获取机制，以及建造和维护它们所需的资源。对于大多数模式而言，成本随着相关土壤磷浓度的下降而增加。因此，成本可以分为一个组成部分发生的土壤磷浓度无关，和一个组成部分描述如何快速成本增加，土壤磷浓度下降。成本对土壤磷浓度的敏感性差异主要来自于菌根真菌菌丝或根系如何经济地探索土壤体积的构建，以及水解或动员不溶性磷形式的渗出物的成本。一般来说，在土壤磷浓度高的情况下，需要最少碳的收购模式随着土壤磷浓度的下降而经历成本的急剧增加。成本和集中度之间的关系表明了不同模式共存的一些原因，以及为什么不同地点之间的收购模式的混合物不同。
Content Summary 1420 I. Introduction 1421 II. Root adaptations that influence P acquisition 1422 III. Costs of P acquisition: general 1423 IV. Costs of P acquisition that are independent of soil P concentrations 1423 V. Costs of P acquisition that increase as soil P concentrations decline 1424 VI. Discussion and conclusions 1424 Acknowledgements 1425 References 1425 SUMMARY: We compare carbon (and hence energy) costs of the different modes of phosphorus (P) acquisition by vascular land plants. Phosphorus-acquisition modes are considered to be mechanisms of plants together with their root symbionts and structures such as cluster roots involved in mobilising or absorbing P. Phosphorus sources considered are soluble and insoluble inorganic and organic pools. Costs include operating the P-acquisition mechanisms, and resource requirements to construct and maintain them. For most modes, costs increase as the relevant soil P concentration declines. Costs can thus be divided into a component incurred irrespective of soil P concentration, and a component describing how quickly costs increase as the soil P concentration declines. Differences in sensitivity of costs to soil P concentration arise mainly from how economically mycorrhizal fungal hyphae or roots that explore the soil volume are constructed, and from costs of exudates that hydrolyse or mobilise insoluble P forms. In general, modes of acquisition requiring least carbon at high soil P concentrations experience a steeper increase in costs as soil P concentrations decline. The relationships between costs and concentrations suggest some reasons why different modes coexist, and why the mixture of acquisition modes differs between sites.