摘要
以 3个气象站的 4 8年气象资料为基础 ,详细分析了作物水分供需分析中使用平均 ET0 的可行性 ,以及由此可能带来的误差程度。分析结果指出 ,在作物水分供需关系中 ,降雨变异所起的作用要远大于 ET0 变异的作用 ,但二者尚处于同一数量级上。因此 ,平均 ET0 法可以在适当的条件下和适宜的范围内使用。但这种方法也存在着引起较大误差的可能性 ,使用时需要慎重的分析和判断。
Based on meteorological data of 48 years from three weather stations at different climatic areas, the applicability and possible error extents of average ET 0 method used in crop water supply and demand analysis are discussed systematically in this paper. The results show that the effects of precipitation variation are more greater than those of ET 0 variation, but both still at the same level of power. Therefore, average ET 0 method is suitable under some conditions and in suitable ranges. There is, however, a significant possibility of resulting in great errors with the average ET 0 method. So that, careful analysis and judgements are needed in utilizing the method.
出处
《灌溉排水》
CSCD
2000年第3期12-15,共4页
Irrigation and Drainage
基金
水利部南水北调局项目!"北方地区主要农作物灌溉用水定额研究"部分内容
