中国生态农业学报2025，Vol.33Issue(6)：1138-1145,8.DOI:10.12357/cjea.20240470
施氮对玉米‖大豆间作产量稳定性的影响
Effect of nitrogen application on yield stability of maize‖soybean intercropping system
摘要
Abstract
Intercropping can improve the yield and stability of crops;however,studies on the effects of nitrogen application rate on yield stability are limited.A field experiment was conducted in Zhangye City,Gansu Province,in China,from 2018 to 2021,includ-ing two nitrogen application rates(N0:0 kg·hm-2;N300:300 kg·hm-2)and three planting patterns[maize‖soybean intercropping(M‖S),monoculture soybean(MS),and monoculture maize(MM)].Crop yields in monoculture and intercropping system were de-termined.The productivity,land equivalent ratio(LER),partial land equivalent ratio(pLER),overyielding,yield stability,and nitro-gen agronomy efficiency were calculated.These indices were analyzed by comparing the monoculture and intercro-pping systems to clarify the effect of nitrogen on the yield and yield stability of M‖S intercropping.The results showed that average over year,compared to monoculture,average LER value of the M‖S intercropping under N0 and N300 was 1.26 and 1.17,respec-tively,both were above 1,indicating that there was a intercropping advantage for the M‖S intercropping,and nitrogen decreased the advantage.Partial land equivalent ratios for maize(pLERm)under N0 and N300 treatments were 0.68 and 0.82,respectively;pLERs were 0.57 and 0.35,respectively,under N0 and N300 treatment.Overyielding of intercropped maize under N0 and N300 treatments were 36.88％ and 64.82％,respectively,whereas soybean overyielding were 14.77％ and-30.46％,respectively.Nitrogen application improved yield stability,and yield stability under N300 treatment increasd by 112.7％ compared to that under N0 treatment(P＜0.05).However,monoculture system exhibited 40.1％ greater yield stability than that of intercropping system(P＜0.05).In intercropping system,the yield stability of maize under N300 treatment was significantly higher(178.6％)than that under N0 treatment(P＜0.05).Nitrogen had no significant effect on the yield stability of soybean.In monoculture system,the yield stability of maize under N300 treatment was significantly higher(127.7％)than that under N0 treatment(P＜0.05);nitrogen application had no significant effect on the yield stability of soybean.The nitrogen agronomy efficiency in intercropping system was 76.7％ higher than that in monoculture system(P＜0.05).In summary,the main contributor to yield advantage was maize in the M‖S intercropping system in the Zhangye City of Gansu Province.Nitrogen improved the yield and yield stability of maize in intercropping system,reduced soybean yield in intercropping system,and did not affect soybean yield stability in intercropping system.关键词
玉米‖大豆间作/氮/超产率/产量稳定性Key words
maize‖soybean intercropping/nitrogen/overyielding/yield stability分类
农业科学引用本文复制引用
孙建好,赵建华,李伟绮,吴科生,陈亮之,杨新强,何旭刚,郑浩飞..施氮对玉米‖大豆间作产量稳定性的影响[J].中国生态农业学报,2025,33(6):1138-1145,8.基金项目
国家重点研发计划项目(2022YFD1900200)和国家自然科学基金项目(32060261)资助 This study was supported by the National Key Research and Development Program of China(2022YFD1900200)and the National Natural Science Foundation of China(32060261). （2022YFD1900200）
