For nitrate accumulation in soil profile, soil under sole fababean was the highest, followed by that under intercropped wheat and fababean, and soil under sole wheat was the lowest.

• 不同种植方式下土壤剖面中硝酸盐累积量趋势表现为蚕豆单作>小麦、蚕豆间作>小麦单作。