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草地学报  2015 

贵州喀斯特山区草地生态系统类型转变对土壤有机碳的影响

DOI: 10.11733/j.issn.1007-0435.2015.04.010, PP. 733-737

Keywords: 喀斯特山区,海拔梯度,生态系统转变,草地开垦,土壤有机碳,变化特征

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Abstract:

为探明喀斯特生态脆弱区土地利用方式转变对土壤有机碳的影响,以贵州省不同海拔梯度下的草地及其相应开垦的农田为研究对象,采用成对设计的方法研究了不同海拔梯度下草地、农田的有机碳特征及草地生态系统类型转变对土壤有机碳的影响。结果表明研究区草地、农田土壤体积质量随土层深度增加显著升高(P<0.05),增幅为17.85%~45.74%,草地转变为农田后土壤体积质量均显著增加,增幅为5.09%~10.88%。研究区草地、农田土壤有机碳含量随土层深度的增加而显著降低,表层(0~10cm)土壤有机碳含量占整个研究区(0~50cm)的54.93%,呈表层富集现象。草地生态系统类型转变导致整个研究区土壤有机碳含量显著下降,降幅为19.64%~57.12%,且降幅随着海拔高度的增加而增大;草地转变为农田使土壤有机碳密度下降,降幅12.22%~50.73%。

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