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沙拐枣是防风固沙的先锋树种,为了保护农田,采取有效途径尽快增加沙漠植被覆盖度,霍城县治沙站于1984年开展了沙拐枣无灌溉直播造林试验。试验区的沙漠海拔高度为540—610米,年降雨量104—130毫米,年蒸发量2000毫米,极端最高气温40.2℃,极端最低气温-42.6℃。冬季积雪厚度14—20厘米。七月份平均气温24.5℃。全年降雨以春、秋、冬季为主,夏季很少。实验地面积为2.1亩,实验区的平沙地覆盖率
Calligonum officinalis is the pioneer tree species for windbreak and sand fixation. In order to protect the farmland and take an effective approach to increase the desert vegetation coverage as soon as possible, Huosheng County Sand Control Station carried out the test of no-irrigation and direct-sowing afforestation in 1984. The test area of the desert altitude of 540-610 meters, the annual rainfall of 104-130 mm, the annual evaporation of 2000 mm, the extreme maximum temperature of 40.2 ℃, extreme minimum temperature of -42.6 ℃. Winter snow thickness of 14-20 cm. July average temperature of 24.5 ℃. The annual rainfall in spring, autumn and winter, few in summer. Experimental area of 2.1 acres, the experimental area of flat sand coverage