集宁—二连浩特铁路干线防护林土壤的理化特性

应用经典统计学方法，对集宁－二连浩特铁路沿线防护林土壤理化特性进行了研究. 结果表明，与林带外相比，林带内土壤容重显著减小，影响其容重大小的主要因素是由林带内外和不同林带类型差异造成的. 林带内表土层物理性砂粒所占比例显著增大，物理性黏粒所占比例降低，心土层、底土层无明显变化. 土壤水分在垂直方向呈先增后降趋势，时间变化表现为减小趋势，林带内土壤含水量以及水贮量损失均显著增大. 林带内表土层有机质、速效钾含量显著增加，心土层、底土层无明显变化. 全氮、速效磷含量无明显变化. 结合不同林带土壤理化性质分析表明，在草原铁路沿线造林工作中，如果立地条件允许，适宜造锦鸡儿林带和榆树林带，锦鸡儿林带起固沙作用，榆树林带起防风作用. 

Study on Soil Physiochemical Properties in Shelter Belt of Jining-Erlinhot Railroad Line

In order to provide some theoretic basis for similar areas, soil physiochemical properties in shelter belt of Jining-Erlinhot railroad line were studied by using classical statistics. Results showed that the soil density was decreased significantly of inner shelter belt compared with the outside. The important factors which influenced soil density were inner and outside and different shelter belt types. Inside shelter belt, the content of surface horizon physical sandy particle was increased markedly, while physical clay was decreased, subsoil horizon and substratum changed indistinctively. In vertical direction, soil moisture increased firstly, and then decreased. With the extension of time, it had the trend of decrease. Both the losses of soil water content and storage were increased markedly. Content of surface horizon organic matter and available K increased significantly, inner subsoil and substrateum changed indistinctively. Content of total nitrogen and available P changed indistinctively. Taking analysis onsoil physiochemical properties in different shelter belt into consideration, the result indicated that if condition is viable, it is feasible to plant caraganas and elms, which can fix sand and prevent from strong wind.