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核农学报  2014 

137Cs技术研究岩溶高原湿地小流域土壤侵蚀特征

DOI: 10:11869/j.issn.100-8551.2014.01.0116, PP. 116-122

Keywords: 137Cs技术,草海,小流域,地貌部位,侵蚀特征

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Abstract:

运用137Cs技术研究了威宁草海沙河小流域不同土地利用方式和地貌部位的土壤侵蚀特征。结果表明:研究区137Cs的背景值为879Bq·m2;农耕地土壤剖面中137Cs中呈均匀分布,非农耕地土壤剖面中呈指数递减分布;不同土地利用方式下,137Cs的面积活度值从大到小为灌丛地>人工草地>农耕地,土壤侵蚀模数值为农耕地>草地>灌丛地;不同地貌部位土壤中,137Cs面积活度值从大到小为下坡>中坡>上坡,侵蚀模数值变化为上坡>中坡>下坡。小流域年均侵蚀模数为:1254.9t·(km2·a)-1,灌丛地侵蚀模数为462.6t·(km2·a)-1,人工草地为630.4t·(km2·a)-1,农耕地为3311.8t·(km2·a)-1。因此,在小流域水土流失综合治理过程中,农耕地是治理的重点。

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