我国北方干草原畜牧业,其生态体系处于脆弱的平衡状态。干旱、风沙、高温、严寒、风雪等各种不利的自然因子,严重地影响着畜牧业的现代化建设;有的年份,当突发性灾害发生时,更会造成牲畜成批死亡、丢失。为了保持生态系统的稳定性,增强牧区的抗灾保畜能力,保证畜牧业生产稳步发展,必须大力提倡种树种草,增强林木的覆 In the steppe husbandry in northern China, its ecological system is in a fragile state of equilibrium. Drought, wind and sand, high temperature, cold, wind and snow and other unfavorable natural factors have seriously affected the modernization of livestock husbandry. In some years, when sudden disasters occur, they can even result in the death and loss of livestock in batches. In order to maintain the stability of ecological system, enhance the capacity of disaster-relief and stock-keeping in pastoral areas and ensure the steady development of livestock husbandry, we must vigorously promote the planting of trees and trees and the improvement of the coverage of trees