基于MOD16的乌江流域地表蒸散发时空特征及影响因素  

Spatiotemporal Characteristics of Evapotranspiration and Its Affecting Factors in Wujiang Basin Based on MOD16

作　　者：蒙雨 但文红[2] 王焕 MENG Yu;DAN Wenhong;WANG Huan(School of Geography and Environmental Science,Guizhou Normal University,Guiyang 550001,China;Key Laboratory of Information and Computing Science of Guizhou Province,Guizhou Normal University,Guiyang 550001,China)

机构地区：[1]贵州师范大学地理与环境科学学院,贵阳550001 [2]贵州师范大学贵州省信息与计算科学重点实验室,贵阳550001

出　　处：《水土保持研究》2020年第6期139-145,共7页Research of Soil and Water Conservation

摘　　要：为探讨贵州省乌江流域地表蒸散发(ET)时空特征及其影响因素,运用MOD16A2/ET产品和气象站数据,通过趋势分析与相关分析法,探讨了乌江流域ET时空变化特征及其影响因素。结果表明:(1)2000—2014年乌江流域年际ET波动较大,年内ET呈周期性单峰变化趋势,ET季节变化表现为夏季(311.31 mm)>春季(245.57 mm)>秋季(138.10 mm)>冬季(132.51 mm);(2)乌江流域ET空间异质性显著,呈西低东高的空间格局,平均ET值为605.43~1208.26 mm;(3)各气候因子对ET的影响范围由大到小依次为降水量(30.67%)>气温(29.56%)>日照时数(23.84%),三者对ET均以正相关为主。乌江流域ET的时空分布特征虽受气候因子所控制,但各因子对ET的影响程度、范围却存在显著差异。To explore the spatialtemporal characteristics of surface evapotranspiration(ET)and its affecting factors in Wujiang Basin,Guizhou Province,MOD16A2/ET products and weather station data,trend analysis and correlation analysis were used to explore the spatiotemporal variation characteristics of ET and its affecting factors.The results show that:(1)from 2000 to 2014,the interannual ET in Wujiang Basin fluctuated greatly,and the annual ET showed a cyclical unitary change trend;the seasonal change of ET decreased in the order:summer(311.31 mm)>spring(245.57 mm)>autumn(138.10 mm)>winter(132.51 mm);(2)ET spatial heterogeneity of Wujiang Basin was significant,showing a spatial pattern of low level in the west and high level in the east;the average ET value was between 605.43 mm and 1208.26 mm;(3)the influence range of each climate factor on ET decreased in order:precipitation(30.67%)>air temperature(29.56%)>sunshine hours(23.84%),the three pairs of ET were mainly positively correlated.Although the spatiotemporal distribution characteristics of ET in Wujiang Basin were controlled by climate factors,the influence degree and range of each factor on ET were significantly different.

关 键 词：地表蒸散发(ET) 时空特征 气候因子 MODIS 乌江流域 

分 类 号：P426.2[天文地球—大气科学及气象学]