2016年在兰州地区不同海拔条件下，研究了玉米/大豆种植模式(玉米单作、大豆单作和玉米/大豆间作)和氮肥水平(不施氮、传统施氮和减量施氮)对作物产量的影响。结果表明，不同种植模式下的传统施氮(CN)和减量施氮(RN)间产量差异不显著。在皋兰、榆中、永登3个试验点，单作玉米在传统施氮(CN)条件下产量较高，分别为13 478.49、12 974.21、11 073.12 kg/hm2；而间作玉米在减量施氮(RN)条件下产量较高，分别是12 387.02、11 994.41、10 879.27 kg/hm2；单作大豆和间作大豆均在减量施氮(RN)条件下产量最高；玉米/大豆间作系统的总产量均以减量施氮(RN)条件下最高，分别是14 024.07、13 533.68、12 306.86 kg/hm2。可见，减量施氮下的玉米/大豆复合种植模式的系统产量并未降低，而氮肥利用效率显著提高，适宜在该区域大面积推广。

Corn/soybean intercropping pattern is widely adopted in different altitudes in Lanzhou city. Whereas the traditional fertilized measures used by farmers are not good for high yield of corn/soybean intercropping system. In order to get high yield for both corn and soybean in this system，a field experiment is conducted to investigate the effect of the system crop yield in 2016. The experiment includes three planting patterns (corn mono cropping， soybean mono cropping and corn/soybean intercropping) and three rates of N fertilizer application， CK， the conventional N application (CN) and the reduced amount of N application (RN). The result indicates that there is no significant difference between CN and RN of yield for different cropping system， for the corn mono cropping， the yields of CN are highest， which are 13 478.49 kg/hm2， 12 974.21 kg/hm2 and 11 073.12 kg/hm2， respectively. For the intercropping corn the yields of RN are highest， which are 12 387.02 kg/hm2， 11 994.41 kg/hm2 and 10 879.27 kg/hm2， respectively. For the mono soybean or intercropping soybean， the yields of CN are highest， and the yields of corn/soybean intercropping are highest either， which are 14 024.07 kg/hm2， 13 533.68 kg/hm2 and 12 306.86 kg/hm2. Therefore， reduced amount of N application for this intercropping system could increase the crop yield per unit area greatly， which could be extended at large scale.

S513；S565.1

兰州市农业科技专项(2015-3-37)，甘肃省农业科学院中青年基金(2015GAAS20)，国家现代农业产业技术体系建设专项(CARS-04-CES17)。