荒漠草原不同时间尺度下垫面水分消耗与气象植被因子的关系  

Relationship between water consumption and meteorology-vegetation parameters in the desert grassland on different time scales

作　　者：王军[1,2] 张瑞强[1,2,3] 李和平 鹿海员[1,2] 曹雪松 刘瑞春[4] WANG Jun;ZHANG Ruiqiang;LI Heping;LU Haiyuan;CAO Xuesong;LIU Ruichun(Institute of Water Resources for Pastoral Area,China Institute of Water Resources and Hydropower Research,Hohhot,Inner Mongolia 010020,China;Institute of Water Resources for Pastoral Area of the Ministry of Water Resources,Hohhot,Inner Mongolia 010020,China;Laboratory of Simulation and Regulation of Water Cycle in River,Beijing 100038,China;Office of the Hangjin Banner Flood Prevention and Drought Resistance,Hangjinqi,Inner Mongolia 017400,China)

机构地区：[1]中国水利水电科学研究院牧区水利科学研究所,内蒙古呼和浩特010020 [2]水利部牧区水利科学研究所,内蒙古呼和浩特010020 [3]流域水循环模拟与调控国家重点实验室,北京100038 [4]杭锦旗防汛抗旱办公室,内蒙古杭锦旗017400

出　　处：《干旱地区农业研究》2020年第4期152-158,167,共8页Agricultural Research in the Arid Areas

基　　金：中国水利水电科学研究院科研专项(MK2020J03,MK2018J05);国家自然科学基金(41901052);流域水循环模拟与调控国家重点实验室专项(SKL2018TS01)。

摘　　要：利用大型称重式蒸渗仪2012—2018年连续观测数据,系统解析了希拉穆仁荒漠草原植物生长季(4—10月)不同时间尺度蒸散发(ET)与气象植被因子之间的关系。研究表明:(1)小时、日和月尺度上,始终与ET保持高度相关的气象植被因子包括风速(P<0.01)、空气温度(P<0.01)和降水量(P<0.01);(2)结合不同时间尺度主控因子,利用多元回归定量表征了小时、日、月尺度的下垫面ET变化特征,经验方程决定系数分别为0.94(P<0.01)、0.42(P<0.01)、0.82(P<0.01),小时和月尺度上的经验方程可较好地反映希拉穆仁荒漠草原下垫面耗水特征;(3)ET与降水差值显示,2012—2018年希拉穆仁荒漠草原植物生长季(4—10月)水汽交换以下垫面水分消耗为主,8月份发生干旱事件的概率最大。Data from a large-scale weighing lysimeter was used to systematically analyze the relationship between the evapotranspiration and meteorology-vegetation parameters on different time scales during the Xilamuren desert grassland plant growth season from 2012 to 2018.(1)Wind speed(P<0.01),air temperature(P<0.01),and precipitation(P<0.01)were significantly correlated with the evapotranspiration on the different time scales.(2)Empirical equations for hourly,daily,and monthly time scales were established based on the multivariate regression analysis with coefficients of determination of 0.94(P<0.01),0.42(P<0.01),and 0.82(P<0.01).,respectively.The empirical equation accurately simulated the water consumption characteristics of the underlying surface of the Xilamuren desert grassland on the hourly and monthly scales.(3)According to the difference between ET and precipitation from April to October,water vapor exchange during the plant growth season was mainly characterized by water consumption on the land surface from 2012 to 2018.The probability of drought occurred the most in August every year.These results are useful for studying water vapor exchange and monitoring drought in the desert grassland.

关 键 词：水分消耗 气象因子 蒸散发 植被指数 水汽交换 荒漠草原 

分 类 号：S181[农业科学—农业基础科学]