放牧破坏地表植被对典型草原地区土壤湿度的影响  

Effect of Vegetation Destruction by Pasturingon Soil Moisture of Typical Grassland

作　　者：佟乌云[1,2] 陈有君[1,2] 李绍良[1,2] 李立民[1,2] 

机构地区：[1]内蒙古农业大学,呼和浩特010018 [2]中国科学院,内蒙古草原生态系统定位研究站

出　　处：《干旱区资源与环境》2000年第4期55-60,共6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：本文研究了放牧对土壤含水量的影响。结果表明 :放牧破坏地表植被后 ,表土层水分入渗速度增加 ,表土层和心土层的土壤温度的变化加剧。使土壤表层 (0 - 2 0 cm)的含水量下降。在地下水位较高的土壤上 ,放牧破坏地表植被后 ,各层土壤的含水量都低于植被未受破坏的土壤 ;但无地下水补给的土壤 ,地表植被破坏后其深层 (30 cm以下 )土壤的含水量则高于植被未受破坏的土壤。说明在无地下水的草原地区 ,植被对表土层 (0 - 2 0 cm)起保水作用 ,对深层则起耗水作用 ,这在土壤水与地上生物量之间的相关分析中也得到证明。这一点在牧草混播时值得注意。The effect of pasturing on soil moisture of typical grassland was studied in the paper. The results show that the destruction of vegetation caused by grazing can increase the infiltration velocity of water in the epipedon and aggravate the change of soil temperature of epipedon and subsiol,which lead to the decrease of water content in epipedon soil (0-20cm). And in the soils with higher groundwater table the destruction of vegetation may decrease soil water contents in almost all layers, But the water contents in deeper layer (below 30cm) of soil without groundwater are higher.Therefore, the research indicates that the vegetation has a protective effect on the epipedon soil water and a consuming effect on deeper layer soil water in the area without groundwater of the typical grassoand.

关 键 词：草原地区 栗钙土 土壤水分 放牧破坏 地表植被 

分 类 号：Q142.3[生物学—生态学] X171[生物学—普通生物学]