| 许振柱,于振文.限量灌溉对冬小麦水分利用的影响[J].干旱地区农业研究,2003,(1):6~10 |
| 限量灌溉对冬小麦水分利用的影响 |
| Effects of limited irrigation on water use of winter wheat |
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| DOI：10.7606/j.issn.1000-7601.2003.01.02 |
| 中文关键词: 限量灌溉 耗水量 水分利用率 冬小麦 |
| 英文关键词:limited irrigation water consumption water use efficiency winter wheat |
| 基金项目:国家自然科学基金资助项目(39970425)； 中国科学院知识创新工程项目(KSCX2-1-07)； 国家重点基础研究发展规划项目(G1999043407)； 科技部"无公害优质小麦生产关键技术集成与产业化示范"项目(2002BA516A12) |
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| 中文摘要: |
| 利用防雨池栽方式研究了不同灌水处理的土壤水分变化规律及其土壤干旱对冬小麦水分利用的影响。实验结果表明,冬小麦对土壤供水具有较高的利用能力。耗水强度最大的时期是拔节至开花期,平均日耗水量达到5.71mm;耗水强度最小的是越冬至返青期,日耗水量不足0.25mm。灌水后使耗水强度加大,总灌水量为420mm的处理(E)的耗水强度是只在播前灌60mm底墒水处理(A)的4.65倍,而前者全生育期耗水量是处理A的1.92倍。生育后期过多灌水或土壤严重缺水均显著影响冬小麦对土壤水分的利用效率。过多灌水显著地降低了灌溉的边际效益,造成了水资源的浪费。 |
| 英文摘要: |
| The studies were carried out in rainfall-proof trough during 19 992000 to investigate the dynamic changes of soil moisture and effects of soil moisture on water use of winter wheat. The results showed that the use cap acity of winter wheat was high for soil supplying water. Water consumption rate was the highest during jointing to flowering, around 5.71 mm/d; but it was the smallest during over-wintering to turning-green, about 0.25 mm/d. Water consu mption rate became higher when irrigated. Water consumption rate of treatment E(total irr igation norm was 420mm) was 4.65 times of that of treatment A, and consumption n orm in whole growth period was 1.92 times. Water use efficiency of winter wheat was influenced considerably by over-irrigation or severe deficit of soil moisture, and over-irrigation decreased obviously marginal profit of irrigatio n and resulted in the waste of water resource. |
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