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首页> 美国卫生研究院文献>PLoS Clinical Trials >Responses of nutrient capture and fine root morphology of subalpine coniferous tree Picea asperata to nutrient heterogeneity and competition
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Responses of nutrient capture and fine root morphology of subalpine coniferous tree Picea asperata to nutrient heterogeneity and competition

机译：亚高山针叶云杉云杉养分吸收和细根形态对养分异质性和竞争的响应

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摘要

Investigating the responses of trees to the heterogeneous distribution of nutrients in soil and simultaneous presence of neighboring roots could strengthen the understanding of an influential mechanism on tree growth and provide a scientific basis for forest management. Here, we conducted two split-pot experiments to investigate the effects of nutrient heterogeneity and intraspecific competition on the fine root morphology and nutrient capture of Picea asperata. The results showed that P. asperata efficiently captured nutrients by increasing the specific root length (SRL) and specific root area (SRA) of first-and second-order roots and decreasing the tissue density of first-order roots to avoid competition for resources and space with neighboring roots. The nutrient heterogeneity and addition of fertilization did not affect the fine root morphology, but enhanced the P and K concentrations in the fine roots in the absence of a competitor. On the interaction between nutrient heterogeneity and competition, competition decreased the SRL and SRA but enhanced the capture of K under heterogeneous soil compared with under homogeneous soil. Additionally, the P concentration, but not the K concentration, was linearly correlated to root morphology in heterogeneous soil, even when competition was present. The results suggested that root morphological features were only stimulated when the soil nutrients were insufficient for plant growth and the nutrients accumulations by root were mainly affected by the soil nutrients more than the root morphology.
机译：研究树木对土壤中养分的异质分布的响应以及相邻根的同时存在，可以加深对树木生长影响机制的理解，并为森林管理提供科学依据。在这里，我们进行了两个分锅实验，研究养分异质性和种内竞争对云杉细根形态和养分吸收的影响。结果表明，P。asperata通过增加一阶和二阶根的比根长度（SRL）和比根比（SRA）并降低一阶根的组织密度来有效地捕获养分，从而避免了对资源和植物的竞争。与相邻根的空间。养分的异质性和施肥的增加不会影响细根的形态，但是会在没有竞争者的情况下提高细根中的P和K浓度。关于养分异质性与竞争之间的相互作用，与均质土壤相比，竞争降低了SRL和SRA，但提高了对异质土壤下钾的捕获。另外，即使存在竞争，P浓度而不是K浓度也与异质土壤的根系形态线性相关。结果表明，仅当土壤养分不足以促进植物生长时才刺激根系形态特征，而根系养分积累主要受土壤养分的影响大于根系形态。

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