| 刘文兆.水源有限条件下作物合理灌溉定额的确定[J].水利学报,1998,29(9):0075-0080 |
| 水源有限条件下作物合理灌溉定额的确定 |
| Rational irrigation quota under limited water supply |
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| DOI： |
| 中文关键词: 灌溉定额 节水灌溉 作物水分生产函数 |
| 英文关键词: irrigation quota water-saving irrigation crop water production function |
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| 摘要点击次数: 2050 |
| 全文下载次数: 181 |
| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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. |
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