威宁县沙河小流域坡耕地土壤的养分特征

Soil Nutrients Characteristics of Slope Cropland in Small Watershed of Sha River in Weining County

为掌握威宁县沙河小流域坡耕地本底资料,为草海湿地保护提供数据支持,采用野外调查与室内分析相结合,研究沙河小流域坡耕地土壤养分含量及分布特征。结果表明:沙河小流域坡耕地全氮(0.06g/kg)、水解氮(17.90 mg/kg)、全磷(0.02g/kg)均处于国家六级水平;全钾(20.53g/kg)、有效钾(512.96mg/kg)分别处于国家二级和一级水平;有机质含量表现下部(23.32g/kg)>中部(17.93g/kg)>上部(14.41g/kg),差异显著;氮、磷、钾及有机质之间存在着明显的相关性。结论:沙河小流域坡耕地养分含量低,水土流失严重。

The content and distribution characteristics of soil nutrients of slope cropland in small watershed of Sha River were studied by field survey and indoor analysis to master the background data of slope cropland in small watershed of Sha River in Weining County and provide the data support for protection of Caohai wetland.The results showed that：1 ）0.06 g/kg of total N,17.90 mg/kg of hydrolyzable N and 0.02 g/kg in soils of slope cropland is at the sixth National level;2）20.53 g/kg of total potassium and 512.96 mg/kg available potassium in soils of slope cropland is at the second and first National level respectively;3）The organic matter content of the bottom,middle and upper soils of slope cropland is 23.32 g/kg,17.93 g/kg and 14.41 g/kg respectively,and there are obvious correlations between nitrogen,phosphorus,potassium and organic matter content.In conclusion,the soil nutrient content of slope cropland in small watershed of Sha River is low,and there is serious water and soil erosion of slope cropland in small watershed of Sha River.