不同牧压强度对草原土壤水分、养分及其地上生物量的影响  

Effect of Graxing Capacity on Water content,Nutrient and Biomass of Steppe Soil

作　　者：张伟华[1] 关世英[1] 李跃进[1] 

机构地区：[1]内蒙古农业大学,呼和浩特010018

出　　处：《干旱区资源与环境》2000年第4期61-64,共4页Journal of Arid Land Resources and Environment

基　　金：中国科学院草原生态系统定位站开放站基金资助

摘　　要：本文通过对不同放牧强度的研究表明 :随着牧压强度的增加 ,土壤表层 (0— 2 0 cm)水分含量明显下降 ,土壤容重与硬度增大、孔隙度减少 ;土壤全量养分下降 ,但速效养分则显著升高 ;植物群落高度降低 ,地表盖度下降 ,地上生物量较大幅度减少 ,特别是优质牧草生物量减少迅速。因此 ,放牧强度是影响草场退化的重要因素。The envirinment of grassland ecosystem in Inner Mongolia is weak. Once it was destroyed, the reverse and establishing ecology is very difficult. With stock-raising production developing, the number of live stock will multiply, the contradictions between live stock and grass will beclme sharp,the pressure of steppe will increase and the degenerate phenomenon will be widespread. The different grazing capacities different effects on physicochemical properties of soil and plant on the strppe, which has been studied and the results are as follows;With the grazing capacity growing, the water content of surface layer soil(0-20cm)reduced obviously, the unit weight of slil and hardness increased,the degree of soil hole reduced, the total nutrient content of soil reduced, but the imstant effective nutrient increased considerably, the height of plant populations reduced, and the biomass on the land the biomass on the land reduced by a big margin, especially the biomass of high quality herbage reduced rapidly So the grazing capacity is important factor to the steppe degeneration.

关 键 词：牧压强度 土壤水分 速效养分 生物量 草原退化 

分 类 号：Q142.3[生物学—生态学]