中文摘要：

为了通过比较经济的成本灵活获取不同尺度的蒸散量，回顾了作物蒸散研究的历史发展，重点评述了作物蒸散不同时空尺度模型及尺度转换方法研究现状，在此基础上，预测了作物蒸散的发展趋势：以精确的点尺度作物蒸散模型为基础，结合遥感数据、数字高程模型和GIS技术建立新颖的空间插值方法，从而实现作物蒸散的空间尺度转换；通过建立精确的基于遥感数据的作物系数模型，利用基于作物系数的时间尺度转换方法，实现作物蒸散时间尺度扩展；基于上述时空尺度转换方法，建立综合性的，面向业务化运行的系统作物蒸散模型。

英文摘要：

Through reviewing the research achievement of crop evapotranspiration at present, the research status of different spatial-temporal scale models and scale conversion methods of crop evapotranspiration was described, and the development trend of research on crop evapotranspiration was hereby forecasted. Firstly, based on remote sensing data, digital elevation model and GIS technology, new spatial interpolation method was established to realize the spatial scale conversion of crop evapotranspiration from the precise point scale to the large scale. Then, on the basis of remote sensing data, accurate crop coefficient model was built to realize temporal scale expansion of crop evapotranspiration by a temporal scale expansion method based on crop coefficient. Finally, a comprehensive and operational model of crop evapotranspiration was established through the spatial-temporal scale conversion method.