间歇灌溉模式不同间歇时间下江淮丘陵区水稻耗水规律及其节水效益研究

Study on Water Consumption Law and Water Saving Benefit of Rice in Jianghuai Hilly Area under Different Intermittent Time of Intermittent Irrigation Mode

为探究间歇灌溉模式不同间歇时间下水稻的节水效益,以江淮丘陵区为例,依托安徽省肥东农水综合试验站,通过划分对照组、短时间歇组及长时间歇组处理,研究了间歇灌溉模式对水稻生育期内各个因素的影响。结果表明:①间歇灌溉可降低水稻耗水量,长时间歇灌溉效果更显著;②间歇灌溉可减少溢流损失,扩大蓄雨空间,提高降雨利用率;③间歇灌溉可显著减少水稻灌水量,长时间歇灌溉下的节水效果更好,且可增产;④在分蘖期与拔节期,间歇灌溉通过减少水稻耗水量及提高降雨利用率达到节水效果,在抽穗开花期及成熟期主要通过减少耗水量产生节水效益。研究得到了水稻各生育期内相对适宜的间歇灌溉时间,对提高区域水稻节水效益具有重要参考价值。

In order to explore the water-saving benefits of rice under different intermittent irrigation modes,taking Jianghuai Hilly area as an example,the influences of intermittent irrigation on various factors of rice in different stages of rice growth period were studied.The study was based on the trial which is divided into control group,short-term group and long-term group at Feidong agricultural water comprehensive test station in Anhui Province.The results showed that:①Intermittent irrigation was beneficial to reduce water consumption in different periods,and the water consumption could be significantly reduced in long-term group;②Intermittent irrigation could reduce the overflow loss,expand the storage space and improve the utilization rate of rainfall;③Intermittent irrigation could significantly reduce the amount of irrigation water,and the water-saving benefit of long-term intermittent irrigation was better,which could also increase production;④In tillering and jointing stage,intermittent irrigation could save water by reducing water consumption and increasing rainfall utilization rate.In heading-flowering and maturity stage,water-saving benefits were produced by reducing water consumption.In this study,the proper intermittent time of rice was obtained,which had important reference value for improving the regional rice water-saving benefits.