不同放牧强度对荒漠草原植被和滩羊生产性能影响研究

Effects of different grazing intensity for vegetation and growth performance of Tan sheep in desert grassland

通过放牧强度对荒漠草原植被和滩羊生产性能影响的研究得出:(1)随着放牧强度的增大,草地牧草生活力减弱;(2)放牧强度与植被总盖度之间存在负相关关系,随着放牧强度的增大草地植被总盖度减小;(3)放牧强度与草地牧草现存量之间存在负相关关系,随着放牧强度的增大,草地牧草现存量减少;(4)放牧强度越大,禾本科、豆科和杂类草牧草所占总产草量的比例越小;(5)滩羊个体增重与放牧强度之间存在着强的负相关,回归方程为:Ga=18.48-7.01G(r=-0.97**);单位草地面积(1hm2)增重与放牧强度之间呈强的相关,回归方程为:Gh=0.31+17.60G-6.60G2(r=0.87*);(6)综合考虑各研究指标,本类草地放牧强度应以不超过0.75只/hm2为宜。

Correlation of production performance of Tan sheep and vegetation under different grazing intensity were studied in the experiment.The results showed that： （1）When the grazing intensity became heavier,the living energy of the pasturage was declined. （2）There was negative correlativity between the grazing intensity and the general coverage of the vegetation ,the grazing intensity became heavier,the general coverage of the vegetation became smaller. （3）There was negative correlativity between the grazing intensity and the standing crop of the pasturage, the grazing intensity became heavier,the standing crop of the pasturage became smaller. （4）The grazing intensity became heavier,the proportion of Gramineae ,Leguminosae and mixed pasturage in total yield of grass became smaller. （5）There was negative correlation between the live weight gain per sheep and the grazing intensity,it could be described as：Ga=18.48-7.01G （r=-0.97^＊＊）. There was positive correlation between the live weight gain per hectare and the grazing intensity, it could be described as： Gh=0.31 ＋17.60G-6.60G2 （r=0.87^＊）. （6）Considering the different research indexes ,the grazing intensity of this type ought not to overtake 0.75 sheep/hm^2.