在干旱、风沙大的牧场上建立防护林,可以改变生态环境,提高草原生产力,促进畜牧业的发展.发达国家很早就注意牧场防护林建设,并把此项工作与农田防护林等同对待.国内一些牧区、半农半牧区也进行过一些尝试.并取得了一定效果.林木对改善草原小气候的效果十分显著.在防风林带背后树高30倍左右范围内,平均降低风速40 The establishment of shelterbelt on dry and windy pastures can change the ecological environment, improve grassland productivity and promote the development of livestock husbandry. Developed countries have long been paying attention to the construction of rangeland shelterbelt and treating this work with farmland shelterbelts. Some domestic pastoral areas , Some efforts have also been made in the semi-agricultural and semi-pastoral areas, and some results have been achieved. The effect of forest trees on the improvement of the microclimates in the grasslands is remarkable. Within a radius of about 30 times the height of the shelterbelts, the average wind speed is reduced by 40