阶段性缺水对冬小麦耗水特性和叶面积指数的影响

为了缓解华北平原淡水资源的不足，合理调配水资源，在中国科学院南皮生态农业试验站进行了淡水阶段性缺水灌溉试验研究，结果表明，当某生育阶段灌水被取消时，不但使作物在本生育阶段受水分胁迫，而且在后续生育阶段也受到一定程度的水分胁迫。相比阶段性缺水来说，旱作对叶面积指数和产量的影响程度最大。与充分灌溉的叶面积指数相比，缺水阶段的减小并不是最大的，缺水阶段之后的叶面积指数减少更大，从节水和对作物生长的影响2个方面综合考虑，缺灌浆水对叶面积指数和产量的影响程度最小。在淡水资源缺乏的区域采用阶段性缺水灌溉是节约水资源的重要途径。

Effects of stage water shortage on water consumption and leaf area index of winter wheat

In order to alleviate the shortage of freshwater resources and adjust the usage of water resources reasonable in North China Plain, experiments were carried out to study the stage water shortage of fresh water in Nanpi ecological experimental station of Chinese Academy of Science in Hebei Province. The results showed that, the crop would suffer water stress in both current and later growth stages when irrigation of certain growth stage was cancelled. Compared to stage water shortage, the influence of dry farming to leaf area index and yield was maximum. However, the leaf area index decrease at water shortage stage was not the largest. Instead, the decrease was significant at post water shortage stage. Taking into account of water conservation and crop growth, the influence of water shortage in grain-filling stage irrigation was minimal on both leaf area index and yield. It is concluded that stage dificiency irrigation is an important water conservation approach in fresh water resource deficient region.