摘要
给定农田腾发量ＥＴ与灌溉定额Ｍ间的关系时，分别以两者为自变量的作物水分生产函数在确定作物合理灌溉定额中的作用是等价的．作物产量与灌溉定额间的关系Ｙ＝Ｙ（Ｍ）一般表现为二次抛物线型．本文揭示了在水源有限，整个灌区不能施行充分灌溉时，Ｙ＝Ｙ（Ｍ）中的常数项ａ的正负性对作物合理灌溉定额的推求有决定性的影响．分别以整个灌区上的总净收益和总产量最大为目标，在假定仅种植单一作物，且地力及其它因素一致的条件下，给出了与Ｙ＝Ｙ（Ｍ）中的常数项ａ大于或小于零以及灌溉水利用系数随灌溉面积变化与否相对应的作物合理灌溉定额的计算式．
This paper reveals that the constant term in the relationship between crop yield and irrigation quota Y=f(M) has a decisive effect on the rational irrigation quota under limited water supply. Taking the overall crop yields or overall net profits on the whole planned area to be maximum as the targets respectively, the paper gives calculating formulae of rational irrigation quota in accordance with that the constant term of Y=f(M) is smaller or greater than zero and the water use coefficient of irrigation water varies with irrigated area or not, supposing one crop is planted and soil fertility and other conditions are at the same levels in the whole planned area.
出处
《水利学报》
EI
CSCD
北大核心
1998年第9期75-80,共6页
Journal of Hydraulic Engineering
基金
中科院"西部之光"计算项目
国家自然科学基金
关键词
灌溉定额
节水灌溉
作物合理灌溉
irrigation quota, water saving irrigation, crop water production function.
