It is a very complicated problem to estimate evapotranspiration (ET) over a large area natural surface.
区域蒸发散的计算是一个非常复杂的问题。
参考来源 - 宁南地区区域蒸发（散）量的遥感研究Megranate row evapotranspiration and winter wheat evapotranspiration havesequential complementarity.
系统蒸散存在时间上的互补性。
参考来源 - 太行山低山丘陵区农林复合模式耗水特征的研究Crop evapotranspiration estimated by Bowen ratio represents the diurnal variation more steadily.
波文比计算值更能稳定地反映出冬小麦蒸发蒸腾量的日变化规律。
参考来源 - 波文比仪与蒸渗仪测定作物蒸发蒸腾量对比Surface evapotranspiration has obvious spatial variability, but traditional measurement methods are based on point measurements.
陆地表面的腾发量分布具有很大的空间变异性,而传统方法只能进行点上的计算。
参考来源 - 期刊学术社区·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
N the return of water vapour to the atmosphere by evaporation from land and water surfaces and by the transpiration of vegetation 蒸发蒸腾作用
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