青藏高原典型高寒荒漠生长季蒸散及水分消耗特征研究

为探究青藏高原典型高寒荒漠下垫面水分消耗规律，以2019年青藏高原典型高寒荒漠地区沱沱河站监测的涡动数据和微气象数据为基础，分析不同时间尺度蒸散值的变化特征和下垫面水分消耗特征，研究结果表明：小时平均蒸散发量最大值出现在14—15时，达0.46 mm·h^-1；日蒸散值最大值出现在7月7日，为8.58 mm·d^-1，最小值出现在4月2日，为0.30 mm·d^-1；整个生长季蒸散值呈先增加后减小趋势，其中7月份最大，为120.68 mm，4月份最小，为64.80 mm；生长季总蒸散发量为581.15 mm，平均每天蒸散4.01 mm。整个生长季累计降水量为235.70 mm，蒸散发量与降水量（Precipitation，Pr）的差值（The difference between ET and Precipitation，IETP）显示，2019年青藏高原典型高寒荒漠植被生长季（4—8月）水汽交换以下垫面水分消耗为主。

Characteristics of Evapotranspiration and Water Consumption of Typical Alpine Desert in the Tibetan Plateau During the Growing Season

To explore the law of water consumption in the underlying surface of a typical alpine desert on the Qinghai-Tibet Plateau, we analyzed the characteristics of ET change and water consumption on different time scales based on the raw eddy-covariance data and meteorological data measured in April to August 2019 from the observation tower on Tuotuohe weather station. The maximum hourly average ET appears at 2-3 p. m, reaching 0.46 mm·h^-1;The maximum value of daily ET was 8.58 mm·d^-1 on July 7, and the minimum value was 0.30 mm·d^-1 on April 2;The ET increased first and then decreased during the growing season, the monthly ET_max was 120.68 mm in July and the ET_min was 64.80 mm in April;The total ET in 2019 growth season was 581.15 mm and the daily average was 4.01 mm. The total precipitation of the whole growing season was 235.70 mm, according to the difference between ET and precipitation(Pr) from April to August, water vapor exchange during the plant growth season was mainly characterized by water consumption on the land surface in 2019.