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拉萨地区年平均降水量约为432毫米,年降水量的90%分布在6—9月,通过在拉萨和白朗县累计7年的裸地及麦田非灌溉地段土壤水分测定看出,其土壤含水量的高峰期在雨季和土壤返浆期。整个旱季土壤含水量变化幅度较小。10厘米以下土壤湿度相对稳定;年度总耗水量为219-492毫米,总耗水量的80%相对集中在6-9月;土壤贮水量的高峰在冬前1月及雨季。0-50厘米土层含水量接近或达到田间持水量,降水可以满足作物对土壤贮水的要求,说明当地具有实施旱作农业的基本条件。
The annual average rainfall in Lhasa is about 432 mm, and the annual precipitation is 90% distributed in June-September. According to the soil moisture measurement in the non-irrigated land in bare land and wheat field in Lhasa and Balang County for seven years, The peak water content in the rainy season and the soil back to the pulp. Soil moisture in the whole dry season changed less. The soil moisture below 10cm is relatively stable. The annual total water consumption is 219-492mm, and the total water consumption is 80% relatively concentrated in June-September. The soil water storage peak is in January and winter before rainy season. The water content of 0-50 cm soil layer approaches or reaches the field water holding capacity. Precipitation can meet the requirement of crops for soil water storage, indicating the basic conditions for implementing the agriculture in dry area.