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基于遥感-过程耦合模型开展淮河流域2001—2012年实际蒸散(ET)的模拟研究,并对其时空变化特征、不同覆被类型下的区域实际蒸散特征及其主要影响因子进行定量分析.结果表明:研究期间,研究区年均ET在空间上呈现由东南向西北逐渐递减的趋势;时间上呈现逐年增加趋势,月际波动为双峰变化曲线.不同植被类型下ET的差异性表现为:农田对研究区域实际蒸散总量的贡献最大;混交林的年均单位面积实际蒸散量最大,裸地的年均单位面积实际蒸散量最小;除裸地以外,其他土地覆被类型年均实际蒸散都呈增长趋势,其中常绿阔叶林实际蒸散增加趋势最明显.平均温度等热力学因子是影响淮河流域实际蒸散的主导因子,其次是辐射因子和水分因子.
Based on the coupled model of remote sensing and process, the simulation of actual evapotranspiration (ET) in the Huaihe River Basin from 2001 to 2012 was carried out, and its temporal and spatial variation characteristics, the actual evapotranspiration characteristics under different types of vegetation and its main influencing factors were quantitatively analyzed. During the study period, the annual average ET of the study area showed a decreasing trend from southeast to northwest in the spatial pattern, showing a trend of increasing year by year and a month-to-month variation curve of monthly variation.The ET performance under different vegetation types was: The largest contribution to the total actual evapotranspiration in the study area; the average annual actual evapotranspiration per unit area of mixed forest, the actual average evapotranspiration per unit area of the bare land; the actual average evapotranspiration The trend of increase of actual evapotranspiration is the most obvious in evergreen broad-leaved forest.The thermodynamic factors such as average temperature are the main factors affecting the actual evapotranspiration in Huaihe River Basin, followed by the radiation factor and water factor.