草原暗栗钙土退化过程中的土壤性状及其变化规律的研究

The Properties of Soil and Its Change Regularities in the Degradated Succession of Dark Chestnut in Leymus chinesis Steppe.

对内蒙古锡盟白音锡勒牧场羊草草原放牧退化系列进行研究，测定了不同放牧强度或退化等级下的暗栗钙土物理性质和化学性质。结果表明，（１）０～１０ｃｍ土层有机质、全氮和全磷含量均随放牧强度的增加呈降低的趋势，有机质和全氮尤为显著。而ＮＨ４－Ｎ、ＮＯ３－Ｎ和速效磷含量则随放牧强度的增加降低的并不显著；（２）随着放牧强度的增加，土壤表层机械组成粗化，土壤沙化特征逐渐加强；（３）随着放牧强度的增加，土壤压实作用明显。

The degradated series of Leymus chinesis Steppe in Baiyinxile Pasture, Inner Mongolia was studied, which included to test physical and chemical properties of soil. The results showed: (1) Soil organic matter, total N and tolal P were distinctly reduced with the increase of grazing intensity; (2) of the upper layer, the soil mechanical composition became coarse and its sandifical characteristic became obvious gratually with the increase of grazing intensity; (3) Soil compaction became distinct with the increase of grazing intensity.