淠史杭灌区灌溉期前后再生稻灌溉需水规律及其驱动因素  

Irrigation water demand patterns and driving factors for ratooned rice before starting irrigation and after stopping irrigation in the Pi-Shi-Hang Irrigation District

作　　者：万义周 吴汉 WAN Yizhou;WU Han(Irrigation Experiment Central Station of Pi-Shi-Hang Irrigation District of Anhui Province,Lu’an 237158,China)

机构地区：[1]安徽省淠史杭灌区灌溉试验总站,安徽六安237158

出　　处：《江淮水利科技》2024年第4期21-27,I0001,共8页Jianghuai Water Resources Science and Technology

基　　金：安徽农作物良种联合攻关(水稻);安徽省自然科学基金项目(2208085US03)。

摘　　要：为揭示灌区开灌前与停灌后再生稻灌溉需水量时空变化及驱动因素,基于Mann-Kendall方法研究了1958—2022年间淠史杭灌区三个子灌区开灌前与停灌后的再生稻灌溉需水量变化规律,并利用多元线性回归和Pearson相关分析的方法进一步检验了包括参考作物蒸散发、降雨量等主要气象因子对灌溉需水量的相对贡献。在开灌前由于开灌日期的不同,淠河灌区、史河灌区、杭埠河灌区再生稻灌溉需水量差异较大,分别为126.6,108.5,93.2 mm,淠河灌区、史河灌区呈现极显著的上升趋势,速率分别为0.55,0.29 mm/a,杭埠河灌区变化趋势不显著。在停灌后,1958—2022年淠河灌区、史河灌区、杭埠河灌区再生稻灌溉需水量分别为58.0,55.1,54.0 mm,三者的变化趋势均不显著;参考作物蒸散发对再生稻灌溉需水量的贡献率超过70%。结果表明:参考作物蒸散发是影响再生稻灌溉需水量的主要因素,相对湿度与日照时数是影响淠史杭灌区开灌前与停灌后的再生稻灌溉需水量两个主要的气象要素。To reveal the spatial and temporal variations and driving factors of irrigation water requirements for ratoon rice before and after irrigation starts and stops in an irrigation district,the Mann-Kendall method was used to study the changes in irrigation water requirements for ratoon rice before starting irrigation and after stopping irrigation in three sub-irrigation areas of the Pi-Shi-Hang Irrigation District from 1958 to 2022.Additionally,multiple linear regression and pearson correlation analysis methods were employed to further examine the relative contributions of major meteorological factors,including reference crop evapotranspiration and rainfall,to irrigation water requirements.The results of the study showed that the irrigation water requirements for regenerated rice in Pihe Irrigation District(PID),Shihe Irrigation District(SID),and Hangbuhe Irrigation District(HID)before starting irrigation was significant differences due to the different start dates,with values of 126.6,108.5 and 93.2 mm,respectively,and showed a significant upward trend at PID and SID,with rates of 0.55 and 0.29 mm/a,while HID changing trends were not significant.After stopping irrigation the irrigation water requirements for regenerated rice in the PID,SID and HID from 1958 to 2022 were 58.0,55.1 and 54.0 mm,respectively,and their changing trends were not significant.The contribution rate of ET0 to the irrigation water demand of regenerated rice exceeded 70%.ET0 is the main factor affecting the irrigation water demand of regenerated rice.Relative humidity and sunshine hours are the two main meteorological factors affecting the irrigation water demand of regenerated rice before starting irrigation and after stopping irrigation in the Pi-Shi-Hang Irrigation District.

关 键 词：淠史杭灌区 开灌前 停灌后 再生稻 灌溉需水量 

分 类 号：S511[农业科学—作物学]