摘要
微咸水灌溉是缓解滨海地区农业淡水短缺的一个可能的解决方案,但是在盐渍化灌区使用微咸水灌溉难度较大。为探究盐渍化灌区如何科学合理地使用微咸水灌溉,以黄河三角洲垦东灌区为研究区,采用大田试验结合HYDRUS-2D数学模型模拟方法,研究滨海盐渍化灌区微咸水灌溉冬小麦田土壤水盐运移的影响。验证结果表明,HYDRUS-2D能够准确模拟微咸水灌溉作用下的土壤水盐分布,通过设定灌水定额为750 m^(3)/hm^(2)下4种灌水矿化度1 g/L(G1)、2 g/L(G2)、3 g/L(G3)和4 g/L(G4)情景,模拟结果表明,不同微咸水灌溉方案处理下0~100 cm土层土壤含水量差异不大,相同微咸水灌溉方案处理下,除0~20 cm土层外土壤含水量均有“上升-下降-平稳”的趋势,土壤含水量沿纵向分层明显,深层相比于浅层土壤含水量高;不同微咸水灌溉方案处理下0~40 cm土层土壤含盐量均有增大趋势,60~100 cm土层土壤含盐量均有减小趋势,土壤含盐量沿纵向分层明显,深层相比于浅层土壤含盐量低;再盐化率随微咸水灌溉矿化度增大而增大,脱盐率随微咸水灌溉矿化度增大而减小。G4使得冬小麦主根区(0~40 cm)平均土壤含盐量达到3.26 g/kg,受到高盐胁迫,脱盐率为39.60%、再盐化率高达68.95%,考虑多指标综合提出了滨海盐渍化灌区冬小麦在关键生育期微咸水灌溉矿化度不宜超过3 g/L。
Brackish water irrigation is a possible solution to alleviate the shortage of agricultural freshwater in coastal areas,but it is difficult to use brackish water irrigation in salinized irrigation areas.In order to investigate how to use brackish water irrigation scientifically and reasonably in salinized irrigation areas,this study takes the Kendong Irrigation Area in the Yellow River Delta as the study area,and adopted field experiments combined with the HYDRUS-2D mathematical model simulation method to study the effects of soil water and salt transport in winter wheat fields irrigated with brackish water in salinized irrigation areas in the coastal region.Validation results showed that HYDRUS-2D could accurately simulate the soil water and salt distribution under brackish water irrigation,and the simulation results showed that the soil water content of the 0~100 cm soil layer did not differ significantly among the different brackish water irrigation scenarios by setting up four scenarios with 1 g/L(G1),2 g/L(G2),3 g/L(G3),and 4 g/L(G4)under the irrigation quota of 750 m^(3)/hm^(2).The simulation results showed that there was little difference in soil water content between the 0~100 cm soil layer under different brackish water irrigation schemes,and under the same brackish water irrigation scheme,except for the 0~20 cm soil layer,soil water content showed a"rising-declining-steady"trend,and soil water content was obviously stratified vertically,with deep layers having a higher soil water content compared with the shallow soil layer;the soil salinity in the 0~40 cm soil layer under different brackish water irrigation schemes had a tendency to increase,and that in the 60~100 cm layer soil salinity had a tendency to decrease.The soil salinity in the 0~40 cm soil layer under different brackish water irrigation schemes had a tendency to increase,and the soil salinity in the 60~100 cm soil layer had a tendency to decrease,and the soil salinity was obviously stratified vertically,with the deep layer having a lower sali
作者
齐翟硕
傅新
张浩然
黄瑾
徐征和
QI Zhai-shuo;FU Xin;ZHANG Hao-ran;HUANG Jin;XU Zheng-he(School of Water Conservancy and Environment,University of Jinan,Jinan 250022,China;Zhongke Shandong Dongying Institute of Geographic Sciences,Dongying 257509,Shandong Province,China)
出处
《节水灌溉》
北大核心
2024年第9期1-11,共11页
Water Saving Irrigation
基金
山东省自然科学基金项目(ZR2022MD059)
中科山东东营地理科学研究所开放基金(202101)。
