基于SEBAL模型的小麦-玉米轮作区蒸散发时空格局及影响因素——以山西省侯马市为例  

Spatiotemporal Pattern and Influencing Factors of Evapotranspiration in Wheat-Maize Rotation Area Based on SEBAL Model

作　　者：曹晨斌 毕如田[1] 贺鹏[1] 王婧姝 胡敏环 CAO Chenbin;BI Rutian;HE Peng;WANG Jingshu;HU Minhuan(College of Resource and Environment,Shanxi Agricultural University,Taigu 030801,Shanxi China)

机构地区：[1]山西农业大学资源环境学院,山西太谷030801

出　　处：《河南科学》2022年第10期1576-1583,共8页Henan Science

基　　金：国家重点研发项目(2021YFD1600301);山西农业大学科技创新基金项目(2017022);山西省社科联重点课题研究项目(SSKLZDKT2021039)。

摘　　要：蒸散发(ET)的精确计算是区域水资源开发保护以及农业发展的重要环节.基于SEBAL模型本研究以Landsat数据和气象数据为基础,计算了2019年山西省侯马市小麦-玉米轮作区农作物典型生育期的ET值,并分析了其时空分布格局及影响因素.结果表明:气象站实测数据与SEBAL模型计算值进行对比,平均绝对误差为0.71 mm/d,平均相对误差为11.58%,均方根误差为0.74 mm/d,SEBAL模型计算精度较高;小麦、玉米在拔节期蒸散发均较大,日均蒸散发分别为6.06、5.48 mm/d;ET在时间上受气象因素影响呈现单峰型变化趋势,具体表现为7月>4月>9月>11月的特征;空间上受地形特征影响整体呈现东南部和西北部偏高,中部与西南部偏低的分布格局;研究区中日照时数为4月与11月蒸散发主导因素,分别占比52.97%、51.63%,相对湿度为7月蒸散发主导因素,占比50.03%,气温则为9月蒸散发主导因素,占比33.95%.Accurate estimation of evapotranspiration(ET)was a crucial part of district water resources development and conservation and agricultural development,particularly in arid and semi-arid zones.According to SEBAL model,we used Landsat and meteorological data to calculate ET value of crops in typical growing period in wheatmaize rotation area in Houma City and studied the spatiotemporal patterns of ET and influencing factors.The measured data of the meteorological station was compared with the calculated values of the SEBAL model.The mean absolute error was 0.71 mm/d,the mean relative error was 11.58%,and the root mean square error was 0.74 mm/d.The SEBAL model had high calculation accuracy.Evapotranspiration of wheat and corn was larger in jointing stage.Average daily ET of wheat was 6.06 mm/d and that of corn was 5.48 mm/d.Influenced by meteorological factors,ET showed a single peak trend,characterized as July>April>September>November.Affected by topographical features spatially,it was high in the northwest and southeast,and low in the southwest and central.In the study area,hours of sunshine was the main factor of ET in April and November,and their proportions were 52.97%and 51.63%respectively.Relative humidity was the main factor of ET in July,accounting for 50.03%,while temperature was the dominant factor of ET in September,accounting for 33.95%.

关 键 词：蒸散发 SEBAL模型 地理加权回归 小麦-玉米轮作区 

分 类 号：S271[农业科学—农业水土工程] S161.4[农业科学—农业工程]