摘要
研究灌水下限为土壤饱和含水率60%-70%的持续胁迫条件下,水稻生育期内耗水量和产量的变化。在本试验条件下水稻需水量为379-460 mm,灌水量为841-1 238 mm,渗漏量为329-389 mm,渗漏量约占灌水量的40%;持续水分胁迫导致水稻减产严重,产量仅为浅湿干对照处理的57.9%-68.2%;在不同生育期内采用不同灌水下限方式所得到的WUE值最高,说明利用水稻在灌水关键期和非关键期对水分敏感性的不同,把有限的水量分配到对缺水最敏感的生育期,可以节约灌溉用水量,提高水分利用效率。
Research is carried out in this paper to study the change of water consumption and yield in the rice growth stages under the condition of continuous irrigation with 60%～70% saturated soil moisture content.The results show that under these conditions,the rice water requirement is 379～460 mm,the irrigation quality is 841～1 238 mm,and the leakage is 329～389 mm,which accounts for about 40% of irrigation.Experimental results prove that continuous water stress leads to serious yield reduction,as it is only 57.9%～68.2% of that irrigated by shallow wet dry style.While the WUE is the highest as using different styles of lower limit irrigation at different growth stages.This shows that by taking advantage of the different sensitivity to water between water-crucial stage and non-crucial stage,irrigation water can be saved and water use efficiency can be improved through distributing limited water over the rice growth stage that is most sensitive to shortage of water.
出处
《节水灌溉》
北大核心
2010年第10期29-31,共3页
Water Saving Irrigation
基金
辽宁省科技重大项目(2008212003)
关键词
持续水分胁迫
中度
耗水量
补偿效应
continuous water stress
moderate
water consumption
compensation effect
