西庄河流域土地利用方式对土壤肥力影响的研究

采用野外调查、取样和实验分析相结合的方法对云南省保山市西庄河山地流域内4种主要土地利用方式（林地、耕地、茶园、灌丛）的土壤理化性质进行对比研究，讨论了不同土地利用方式对土壤肥力的影响，结果表明，不同的土地利用方式对土壤肥力具有比较明显的影响：土壤有机质和全氮质量分数变化从大到小依次为灌丛＞林地＞茶园＞耕地；磷、钾元素表现为耕地＞茶园＞林地＞灌丛；土壤阳离子交换量表现为耕地＞茶园＞灌丛＞林地；盐基饱和度表现为耕地＞灌丛＞林地＞茶园；农业耕作活动对表层土壤物理性质影响明显。

Effects of Land Use Types on Soil Fertility in Xizhuang Watershed

Soil physical and chemical properties under the four main types of land use (forest land, farmland, tea garden and bush land) in the Xizhuang watershed, Baoshan, Yunnan province, has been studied through field soil sampling and laboratory analysis. Effects of different land use types on soil fertility have been discussed in this paper. The results show that the different land uses will have obvious effects on soil fertility. Both soil organic matter and total nitrogen content decline in a sequences from bush land, forest land and tea garden to farm land; phosphorus and potassium content decline in a sequences from farmland, tea garden and forest land to bush land; cation exchange capacity (CEC) from farmland, tea garden and bush land to forest land; and base saturation percentage (BSP) from farm land, bush land and forest land to tea garden. Farming practices have significant impacts on the physical and chemical properties of topsoil.