明确不同大豆品种或品种混合与玉米间作对多样性效应的影响，为河西走廊灌区玉米‖大豆合理种间配置提供参考。于2021 — 2022年开展田间试验，设置6个间作体系，即玉米‖长农15(M‖CN15)、玉米‖陇中黄601(M‖LZH601)、玉米‖陇豆78-1(M‖LD78-1)、玉米‖Williams82(M‖Williams82)、玉米‖(陇豆78-1+Williams82，M‖2SM)和玉米‖(长农15+陇中黄601+陇豆78-1+Williams82，M‖4SM)，研究不同间作体系对作物产量、净效应、互补效应和选择效应的影响。结果表明，M‖LZH601、M‖LD78-1体系大豆产量显著高于其他间作体系；M‖LZH601体系玉米产量与M‖CN15体系玉米产量差异不显著，但显著高于其余间作体系中玉米产量。间作大豆和间作玉米对间作混合产量的平均贡献率分别为7.33%、92.67%。各间作体系2 a平均净效应值均大于0，其中M‖LZH601体系净效应最高，为3 768.0 kg/hm2。M/Williams82、M‖2SM、M‖4SM体系的互补效应值均小于0，对多样性效应的贡献率均为0；M‖CN15、M‖LD78-1、M‖LZH601体系的互补效应值均大于0，选择效应对多样性效应的贡献率分别为66.9%、65.3%、71.1%。综上，玉米‖大豆间作体系产量优势主要来源于玉米产量贡献，生物多样性效应以选择效应为主，M‖LZH601体系可保证大豆和玉米产量稳定，大豆品种混合后与玉米间作不利于间作产量优势发挥。

To clarify the effects of different soybean varieties or variety mixtures with maize intercropping on diversity effect of maize/soybean intercropping systems and to provide a reference for rational interspecific configuration of maize/soybean intercropping in irrigated areas of the Hexi Corridor, a field experiment was carried out from 2021 to 2022. 6 intercropping systems were established: maize‖Changnong 15 (M‖CN15), maize‖Longzhonghuang 601 (M‖LZH601), maize‖Longdou 78-1 (M‖LD78-1), maize‖Williams 82(M‖Williams82), maize‖(LD78-1 + Williams82, M‖2SM), and maize‖(CN15 + LZH601 + LD78-1 + Williams82, M‖4SM). Effects of different intercropping systems on crop yield, net effect, complementarity effect, and selection effect were investigated. Results showed that soybean yields in M‖LZH601 and M‖LD78-1 systems were significantly higher than those in other systems. Maize yield in M‖LZH601 was not significantly different from M‖CN15 but was significantly higher than those in the other intercropping systems. The average contributions to total mixed yield were 7.33% from soybean and 92.67% from maize. The 2-year average net effect was greater than 0 for all systems, with M‖LZH601 having the highest net effect of 3 768.0 kg/ha. The complementarity effects in M‖Williams82, M‖2SM, and M‖4SM were negative, contributing nothing to diversity effect; by contrast, M‖CN15, M‖LD78-1, and M‖LZH601 had positive complementarity effects, with contribution rates of selection effects to diversity effects listed as 66.9%, 65.3%, and 71.1%, respectively. In conclusion, the yield advantage of maize/soybean intercropping mainly came from maize yield contribution. Diversity effect was primarily driven by selection effect. The M‖LZH601 system ensured stable yields for both crops, while variety mixture intercropping with maize was not conducive to yield advantage expression.

S565.1；S513

国家重点研发计划(2022YFD1900200)；甘肃省农业科学院中青年基金(2023GAAS36)。