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草业学报  2014 

不同利用方式下草地优势植物的生态化学计量特征

DOI: 10.11686/cyxb20140606, PP. 45-53

Keywords: 草地,不同利用方式,优势种,生态化学计量特征

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Abstract:

在内蒙古温带草原围封、放牧和割草3种不同利用方式下,测定了大针茅、冷蒿和羊草3种优势种植物的化学计量元素,探讨了草地不同利用方式下优势种植物的化学计量特征响应机制。结果表明,3种优势种植物的C、N、P含量及其计量比在不同利用方式下均有明显的季节变化;不同利用方式、不同物种以及二者的交互作用均对N、P含量及C∶N、C∶P和N∶P有显著的影响,其中,C含量比较稳定,不同的利用方式对其无显著影响,N含量在整个生长季内总体呈下降趋势,放牧样地3种植物叶片的N、P含量均高于割草和围封样地,说明放牧增加了植物N、P的含量。植物生长普遍受到N的限制,土壤养分特征在不同利用方式间也存在一定的差异,围封样地表现为更加缺N,而放牧样地更加缺P。放牧样地有机质、C、N和P含量均高于割草和围封样地,说明适度放牧能提高土壤养分的含量,有利于植物的生长。

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