高寒混播草地牦牛优化放牧强度的研究 Ⅰ以牦牛增重为目标研究牧草生长季的最佳放牧强度  

Study on optimal grazing intensity for yak in Elymus natans/Puccinellia tenuflora mixed-sown pasture Ⅰ Optimal grazing intensity based on yak live-weight gain during forage growing season

作　　者：董全民[1] 马有泉[1] 李青云[2] 赵新全[3] 马玉寿[1] 孙小弟[1] 施建军[1] 王彦龙[1] 盛丽[1] 

机构地区：[1]青海省畜牧兽医科学院,青海西宁810016 [2]青海省农牧厅,青海西宁810001 [3]中国科学院西北高原生物研究所,青海西宁810001

出　　处：《草业科学》2008年第7期87-90,共4页Pratacultural Science

基　　金：国家"十五"科技攻关计划重大项目(2001BA606A-02);2005年度青海三江源自然保护区生态保护和建设总体规划科研课题及应用推广招标项目(2005-SN-1);国家"十一五"科技支撑计划重大项目(2006BAC01A02)

摘　　要：垂穗披碱草Elymus nutans—星星草Puccinellia tenuiflora混播草地3个放牧季的牦牛放牧试验结果表明:相同放牧区每公顷草地牦牛总增重之间的差异不显著(P>0.05),同一放牧季各放牧区牦牛总增重之间的差异极显著(P<0.01),且各放牧季牦牛的个体增重与放牧强度均呈显著的线性回归关系;2003年单位面积草地牦牛增重随放牧强度的增加而增加,2004和2005年单位面积草地牦牛增重与放牧强度呈二次回归关系;通过二次回归方程计算得到:牧草生长季牦牛最佳放牧强度为7.23头/hm2。The results of grazing trial with yak in Elymus nutans/Puccinellia tenuiflora mixed-sown pasture cross three grazing seasons showed that total yak live-weight gains of every grazing season in the same grazing plot was not significantly different （P〉0.05） but total yak live--weight gains of every grazing plot were extremely significant difference in the same grazing season（P〈0.01）, and that the relationship between live-weight gains per yak of every grazing plot and grazing intensities showed a linear regression. The yak live-weight gain per hectare increased with the increase of grazing intensity in 2003, and the relationship belween live-weight gains per yak of every grazing plot and grazing intensities showed a quadratic regression in 2004 and 2005. The optimal grazing intensity of yak during forage growing season was 7.23 head/hm^2 by calculating with quadratic regression equation.

关 键 词：混播草地 牦牛 个体增重 单位面积增重 最佳放牧强度 

分 类 号：S823[农业科学—畜牧学]