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一、自然概况当雄县位于藏北高原东南侧,全县有草原面积100万公顷。据该县气象站13年气象资料统计,年均温1℃,年均最低温-5.5℃,年均最高温10.5℃,年极端最低温-35.9℃,极端最高温23.2℃,≥0℃的年积温2946.2℃;年蒸发量1970mm,为降水量(488mm)的4倍以上,初终霜日期间隔平均58天,植物生长期130～140天左右。试验在当雄县原拉根
First, the natural profile Damxung County is located in the southeastern side of the northern Tibet Plateau, the county grassland area of 1 million hectares. According to the 13-year meteorological data of the county’s weather station, the average annual temperature is 1 ℃, the annual average temperature is -5.5 ℃, the annual average temperature is 10.5 ℃, the annual minimum temperature is -35.9 ℃, the extreme maximum temperature is 23.2 ℃, and the temperature is ≥0 ℃ Annual accumulated temperature of 2946.2 ℃; annual evaporation of 1970mm, more than 4 times the amount of precipitation (488mm), the beginning of the final frost date interval of an average of 58 days, the plant growth period of 130 to 140 days. The trial was conducted in Dang Xiong County