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作 者 ：叶优良,李 隆,孙建好.

期 刊 ：中国生态农业学报 2008年 16卷 4期 页码：818-823

关键词：豆科作物；玉米；单作；间作；硝态氮累积；土壤剖面；

Keywords:Legume crop, Maize, Monocropping, Intercropping, Soil nitrate-N accumulation, Soil profile,

摘 要 ：为提高氮肥利用效率，减少过量施用氮肥对环境造成的污染，本文以甘肃省河西灌区为试验地点，在0和225 kg(N)·hm^-2氮水平下，探讨了蚕豆、豌豆、大豆3种豆科作物与玉米间作对土壤硝态氮累积和分布的影响。研究表明：蚕豆收获后，间作的蚕豆、大豆、豌豆和玉米土壤硝态氮累积量在两个氮水平下均低于相应的单作，蚕豆、大豆、豌豆的间作土壤剖面硝态氮含量也低于相应的单作，但表现的土层深度各异。玉米收获后，蚕豆和豌豆的间作土壤硝态氮累积量低于单作；不施氮条件下，大豆间作土壤硝态氮累积量低于单作，与蚕豆、豌豆和大豆间作的玉米土壤硝态氮累积量均高于单作玉米；在225 kg(N)·hm^-2氮水平下，与蚕豆和豌豆间作的玉米土壤硝态氮累积量低于单作玉米，间作大豆和与大豆间作的玉米土壤硝态氮累积量高于相应的单作。玉米收获期，不施氮条件下3种豆科作物间作0～60 cm土壤硝态氮含量均低于单作；225 kg(N)·hm^-2氮水平下，蚕豆、豌豆间作0～60 cm土壤硝态氮含量低于单作，而间作大豆0～100 cm土壤硝态氮含量高于单作。对不同深度土壤硝态氮相对累积量分析表明，蚕豆收获期间作0～60 cm土层相对累积量高于单作，而100～180 cm土层则低于单作。

Abstract:In order to improve nitrogen use efficiency and to reduce environmental pollution from excessive nitrogen application, soil nitrate-N content and accumulation in intercropped legume maize under 0 and 225 kg(N)·hm^-2 application were investigated in the Hexi Corridor of Gansu Province. The results show that soil nitrate-N accumulation in intercropped faba bean, soybean, pea and maize is lower than the monocrops under 0 and 225 kg(N)·hm^-2 application at faba bean harvest. Nitrate-N content in the soil profile with intercropped faba bean, soybean and pea is lower than the monocrops, with various effecting depths for different crops. At maize harvest, nitrate-N accumulation in the soil of intercropped faba bean and pea is lower than the monocrops. Under zero nitrogen application, soil nitrate-N accumulation in intercropped soybean is lower than monocropped soybean, and that for maize-faba bean, soybean and pea intercrop higher than the monocrops. Under 225 kg(N)·hm^-2 nitrogen application, soil nitrate-N accumulation in intercropped maize-faba bean and pea is lower than the monocrops, while intercropped soybean and maize soybean intercrop is higher than the monocrops. Nitrate-N content in 0～60 cm soil profile with intercropped faba bean and pea are lower than the monocrops under zero N application and 225 kg(N)·hm^{-2 N application; while that with soybean lower than the monocrop at zero N application, but higher at 225 kg(N)·hm-2 application. Relative soil nitrate-N accumulation suggests that soil nitrate-N accumulation in intercropping treatments is higher than in monocropping at 0～60 cm, but lower than in monocroping at 100～180 cm.}

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