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观测了西藏左贡农区的土壤水分动态特征， 分析了农田水分供需平衡状况，结果表明， 在青稞生育期内， 农区土壤水分变化可分为三个时期， 缓慢失墒期， 强烈失墒期和墒情恢复期。其中， 强烈失墒期水分亏缺最严重， 易出现旱情。农田水分供需平衡状况结果亦表明， 青稞播种－ 出苗， 出苗－ 分蘖两生育期水分供需严重失衡， 土壤水分含量过低， 水分满足率分别仅为２０３％ 、１６４％ 。其余时期均能满足作物水分需求。乳熟期后还有较多水分盈余。
The dynamic characteristics of soil moisture in Zogong farmland of Tibet were observed and the balance between supply and demand of farmland moisture was analyzed. The results showed that during the growth period of barley, the change of soil moisture in farmland could be divided into three periods: slow loss of soil moisture, Period and moisture recovery period. Among them, the water loss is the most serious loss of moisture period, prone to drought. The results of farmland water supply and demand balance also showed that there was a serious imbalance between supply and demand of water during the growth and development of barley - emergence and emergence - tillering. The soil moisture content was too low, and the water satisfaction rates were only 203% and 164% respectively. The remaining period can meet the crop moisture requirements. After milking there are more water surplus.