干草原放牧强度对草地生态变化及其利用效果的影响  

Effects of Grazing Intensity on the Water Content of Grassland Soil, Grassland Productivity and Sheep Increasing Weight

作　　者：武新 罗有仓 陈卫民[3] 武芳梅 

机构地区：[1]宁夏草原工作站,宁夏银川750002 [2]宁夏海原县草原站,宁夏海原751800 [3]宁夏大学,宁夏银川750021

出　　处：《家畜生态学报》2005年第6期81-84,共4页Journal of Domestic Animal Ecology

基　　金：宁夏自然基金资助项目(项目编号:A3011)

摘　　要：通过不同强度的放牧试验表明,不同的放牧强度对土壤表层含水量、植被特征和绵羊增重都有程度不同的影响。随放牧强度的增加,土壤表层(0-20 cm)含水量、牧草叶层高度、多度呈下降趋势;草地地上生物量下降显著(P<0．05,放牧羊只增重差异不显著,但单位草地面积的羊只增重重度放牧区和中度放牧区较轻度放牧区分别提高56．14％(P<0．01)和 23．26％(P<0．05)。The test of grazing of different intensity indicated that the grazing intensity had different influence for water content in soil top layer, vegetation characteristic, and sheep increasing weight. If grazing intensity was increased, water content in soil top layer（0-20 cm）, the height of leaf layers and many degrees of pasture would have the trend of descending. At the same time, the biomass on the ground of grassland is remarkable changes （P〈0.05）, and sheep increasing weight was not remarkable changes. In addition, the biomass in heavy grazing area and in slightly grazing area was increased by 57.98% and 25. 9%, respectively.

关 键 词：放牧试验 放牧强度 土壤含水量 植被特征 绵羊增重 

分 类 号：S811.5[农业科学—畜牧学]