老风口是一个干旱缺水的地区。防风阻雪林的建设,不仅极大的减轻了风雪灾害对过往车辆的影响,而且改善了当地的生态环境。根据测算,林区森林植被覆盖率达到24.33%,年拦阻雪量约1651.06万m3,融雪水量约为1238.3万m3;林区内的风速较旷野降低30%～50%,气温振幅减少±1.5～3.1℃,空气相对湿度可提高2%～5%,蒸发量降低5%～20%。 The old tuyere is a dry and watery area. Snow-blocking snow forest construction, not only greatly reduced the impact of snow disaster on the passing vehicles, but also to improve the local ecological environment. According to the calculation, the coverage of forest vegetation in forest area reaches 24.33%, the annual blockage of snowfall is about 16.51.06 million m3 and the amount of snow melt water is about 12.383 million m3; the wind speed in forest area is reduced by 30% -50% 3.1 ℃, air relative humidity can be increased by 2% to 5%, the evaporation reduction of 5% to 20%.