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草业科学  2014 

放牧对内蒙古大针茅草原土壤剪切力空间分布的影响

DOI: 10.11829\j.issn.1001-0629.2013-0520, PP. 219-223

Keywords: 放牧,土壤剪切力,空间分布,土壤水分

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Abstract:

?本研究在内蒙古草原生态系统研究站的持续放牧(CG)和禁牧(UG79,从1979年开始禁牧)两个试验区。利用GPS在每个区分别设立1个长135m×105m的样地,每样地选100个测量点,利用Hand-heldvanetester测量土壤剪切力并研究其空间分布情况。结果表明,CG区,放牧导致土壤孔隙减少,容重增加,有机质减少,土壤剪切力高于凋落物与有机质较多的禁牧小区。在UG79和CG两个区,从干旱条件到中等水分条件,土壤剪切力空间分布都有差异,说明土壤含水量在一定程度上决定了土壤剪切力的空间分布,但到达湿润条件后,其分布有恢复原状的趋势,这暗示土壤水分对其影响也存在限制。

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