中文摘要：

为了揭示节水灌溉稻田腾发量在不同尺度间的差异，基于田间实测数据，对比分析了节水灌溉田块尺度与小区尺度间稻田腾发量的差异性。结果表明，节水灌溉水稻整个生育期不同尺度腾发量间存在显著差异，田块尺度的总腾发量比小区尺度小18.7%。各生育期稻田腾发量尺度间差异显著（P＜0.05），不同时段（旬、候）稻田腾发量尺度间差异极显著（P＜0.01）。节水灌溉条件下稻田下垫面状况、大气湍流状况、灌溉补水过程、土壤水分状况以及气象因子是造成不同尺度稻田腾发量差异的主要原因。气象因子中空气相对湿度和气温造成了尺度间腾发量差异的变化。稻田腾发量尺度差异的揭示可为稻田腾发量在尺度间的转换提供依据。

英文摘要：

In order to reveal the difference of evapotranspiration of paddy fields under water-saving irrigation on different scales, the differences of evapotranspiration between field scale and plot scale of paddy field under water-saving irrigation was analyzed based on the field experiment. In addition, the reasons for the difference between evapotranspiration of paddy fields under water-saving irrigation on different scales were investigated in this paper. The evapotranspiration on field scale and plot scale of paddy fields under water-saving irrigation was measured by eddy covariance system and lysimeter, respectively. The results showed that there were significant （p〈0.05） differences between the evapotranspiration of paddy fields under water-saving irrigation on filed scale and plot scale in the whole and early, middle and late growth stages. The variation trend of evapotranspiration of paddy fields under water-saving irrigation on field scale was similar to that on plot scale. But the difference existed on value of evapotranspiration of paddy fields under water-saving irrigation. The evapotranspiration on field scale of paddy fields under water-saving irrigation in the whole growth stages was 18.7%smaller than that on plot scale. The evapotranspiration on field scale of paddy fields under water-saving irrigation in the early, middle and late growth stages was 15.5%-20.5%smaller than those on plot scale. The significant differences （p〈0.05） were also showed between the evapotranspiration of paddy fields under water-saving irrigation on field scale and plot scale in the different growth stages. High significant differences （p〈0.01） were showed between the evapotranspiration of paddy fields under water-saving irrigation on field scale and plot scale in different times （ten days, five days）. The evapotranspiration of paddy fields under water-saving irrigation on field scale in ripening stage increased by 7.9%compared to that on plot scale. The evapotranspiration of paddy fields under water-saving