典型草原定居放牧草场群落特征与土壤有机质含量关系分析

Relationship between community characteristics and soil organic content in settled grazing grassland of typical steppe

为了探讨定居放牧两季轮牧条件下草场植物群落特征与表土层有机质含量的对应变化关系,笔者以克氏针茅草原为研究对象,进行了草场群落特征调查及表土层有机质含量测试分析。结果表明:定居放牧区的多年生植物种类减少,一年生植物种类增多,表土层有机质含量减少。植物生物量与表土层有机质含量之间呈负相关关系,总盖度与表土层有机质含量之间呈正相关关系。典型草原定居放牧区的群落特征变化与本地区实施的草畜经营管理归牧户所有等制度的实施及定居放牧两季轮牧等网围栏限制放牧有关。

Under the condition of two-season settled grazing,in order to discuss the corresponding relationship between plant community characteristics of grassland and organic matter content of surface-soil,we investigated the community characteristics of the Stipa krylovii grassland,tested and analyzed the organic matter content in surface soil. The results showed that perennial plants are reducing gradually,annual plants are increasing constantly and organic matter content of surface-soil is also decreasing in settled-grazing area. Correlation between biomass and organic matter content in surface soil is positive,that between total coverage and organic matter content in surface soil is negative. The changes of community characteristics in typical settled grazing area are related to the right of grassland management and two-season settled grazing in net fence.