灌溉排水学报2025，Vol.44Issue(4)：1-14,14.DOI:10.13522/j.cnki.ggps.2024327
调亏灌溉对玉米大豆间作群体光能辐射利用效率的影响
Effects of regulated deficit irrigation on light energy radiation use efficiency of maize-soybean intercropping system
摘要
Abstract
[Objective]Maize-soybean intercropping is a common cultivation technique in Northwestern China.However,one challenge with this system is the uneven distribution of interspecific light energy and the inefficient use of light and irrigation water.This study proposes a strategy to enhance crop canopy cover and photosynthesis by controlling irrigation during the non-critical reproductive period of maize.The objective is to reduce the shading effect of maize on soybean while improving yield and light energy utilization efficiency.[Method]A field experiment was conducted with four irrigation treatments:① sufficient irrigation for both maize and soybean(IW1),②sufficient irrigation for maize and deficient irrigation(50%)for soybean(IW2),③ deficit irrigation for maize(50%)and sufficient irrigation for soybean(IW3),and ④ deficit irrigation(50%)for both maize and soybean(IW4).Soybean was intercropped with two maize varieties:Xianyu 335(C1)and Longdan(C2).A monocropping system served as the control,with two irrigation treatments:sufficient irrigation(MW1)and deficit irrigation(MW4).The experiment measured morphological indices,net photosynthetic rate(Pn),canopy changes,light energy interception,competition ratio(CR),land equivalent ratio(LER),and irrigation water use efficiency(iWUE)for both crops under each treatment.[Result]① Under the same irrigation treatment,soybean intercropped with C1 showed significantly higher Pn(26.90%),leaf area index(LAI)(5.38%),and aboveground biomass(5.42%)compared to intercropping with C2.Additionally,it reduced the intercepted photosynthetically active radiation(IPAR)of soybean by 6.25%while significantly improving the total radiation use efficiency(RUE)of the intercropping system.② Changes in irrigation had significant effects on Pn,plant height,LAI,and aboveground biomass for both crops.In particular,IW3 reduced irrigation requirements by 16.79%compared to IW2,significantly increased Pn,LAI,and biomass of soybean,and decreased IPAR by 10.43%.Intercropping improved total RUE by 2.42%.③ Under the same irrigation treatment,soybean intercropped with C1 had higher yield,iWUE,and CR compared to intercropping with C2.The total LER of C1 also increased by 2.38%.④ Compared to IW2,IW3 increased soybean yield by 19.95%,total iWUE by 15.17%,and total LER by 8.12%.[Conclusion]Among all treatments,IW3 combined with soybean intercropped with the maize variety Xianyu 335 significantly enhanced soybean growth and improved radiation use efficiency for both crops.This strategy offers a promising approach to optimizing resource use and increasing the productivity of the maize-soybean intercropping system.关键词
间作/调亏灌溉/辐射利用效率/玉米/大豆Key words
intercropping/deficit irrigation/radiation use efficiency/maize/soybean分类
农业工程引用本文复制引用
陈文聪,段世名,廖祺,杜太生..调亏灌溉对玉米大豆间作群体光能辐射利用效率的影响[J].灌溉排水学报,2025,44(4):1-14,14.基金项目
国家自然科学基金重点项目(52239002) （52239002）
