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中国沙漠  2014 

阿拉善荒漠典型植物功能群氮、磷化学计量特征

DOI: 10.7522/j.issn.1000-694X.2013.00431

Keywords: 荒漠生态系统,功能群,N:P,生态化学计量学

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Abstract:

氮(N)、磷(P)作为荒漠生态系统重要的养分元素和限制性因子,在维持植物功能群组成及结构稳定、生态系统内养分循环中发挥着重要的作用。本研究沿水热梯度从东至西在阿拉善荒漠设置52个调查样地,通过对优势植物的调查取样,分析了荒漠植物不同功能(类)群N、P元素的生态化学计量特征,并就N、P含量及N:P值对荒漠植物的限制性作用进行了检验和讨论。结果显示:(1)所调查阿拉善荒漠区植物叶片的N、P含量分别为10.65±7.91mg·g-1和1.04±0.81mg·g-1,N:P值为11.53±5.06,叶片N含量与P含量及N:P值均显著正相关,P含量与N:P值显著负相关;通过对比分析认为该区植物同时受到N、P双重制约,且更易受N限制。(2)从植物生活型比较,认为草本植物叶片N、P含量均高于灌木植物叶片,而灌木植物叶片的N:P值大于草本植物;对光合作用途径分析发现,C3植物叶片N含量高于C4植物叶片,而C4植物叶片P含量高于C3植物叶片;从系统发育类型方面分析,认为单子叶植物叶片N含量低于双子叶植物叶片N含量,而P含量则高于双子叶植物叶片P含量。

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