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青藏高原东部窄叶鲜卑花灌丛土壤c、n、p生态化学计量学特征*

DOI: 10.3724/SP.J.1145.2015.04010, PP. 1-9

Keywords: 窄叶鲜卑花,生态化学计量学,土壤碳,土壤氮,土壤磷,青藏高原

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Abstract:

土壤是陆地生态系统的重要组成部分,研究土壤生态化学计量学特征对于揭示土壤元素的循环和平衡机制具有重要意义。本文采用分层随机抽样方法来布设样地,选取16个位于青藏高原东部的窄叶鲜卑花灌丛样地进行取样调查,并对土壤样品碳(c)、氮(n)、磷(p)含量进行了测定与分析。结果表明窄叶鲜卑花灌丛土壤表层(0-10cm)c、n、p含量的均值分别为73.27±20.25gkg-1、6.27±1.8gkg-1和1.13±0.25gkg-1,该灌丛土壤c、n、p含量均随土层深度的增加而减少,且减少的程度不一;c、n含量的变异系数总体上随土层加深而增大,p含量的变异系数相对稳定;c、n之间的相关性和线性拟合程度均高于c、p和n、p。同时,本文还同步分析了窄叶鲜卑花灌丛不同土层c、n、p比值特征,结果显示:窄叶鲜卑花灌丛土壤表层(0-10cm)c/n、c/p和n/p的均值分别为10.88±0.87、59.49±18.64和5.49±1.84,空间变异性表现为:c/n<n/p<c/p,c/n、c/p和n/p的变异系数随着土层加深而增加,土壤c、n、p的空间分布特征在一定程度上决定了c/n、c/p和n/p的空间分布特征。青藏高原东部窄叶鲜卑花灌丛土壤c、n、p含量的分布格局及其生态化学计量学特征的研究,可为青藏高原灌丛植被保护、恢复和土壤养分管理提供理论依据。

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