鲁东大学学报(自然科学版)

为探求不同间作模式对盐碱土壤的影响，提高盐碱地牧草的产量和品质，本研究以黄河三角洲地区中重度盐碱地代表性禾本科和豆科牧草为研究对象，对比分析了燕麦草(Arrhenatherum elatius(L.) Presl)和苜蓿(Medicago sativa L.)单作、三行间作和五行间作种植对牧草品质和土壤质量的影响，三行间作是指燕麦草和苜蓿各自每三行为一组交替排列种植，五行间作同理。结果表明：禾豆间作模式能够显著提升牧草的产量和品质，牧草五行间作年产量为4 447.133 kg·hm^-2,略高于三行间作，比燕麦草和苜蓿单作产量高7.91%和9.57%,牧草五行和三行间作模式下燕麦草蛋白质含量比单作分别高3.74%和5.22%;在土壤质量方面，间作模式下牧草样地的pH值明显下降，10～30 cm处最为明显，并促进土壤中有机质以及硝、铵态氮质量分数的增加，苜蓿单作对有机质以及硝、铵态氮质量分数的增加最显著。综上，在盐碱地实行燕麦草和苜蓿间作种植有利于提高牧草的产量和品质，对土地质量也有一定的促进作用。

In order to explore the effects of different intercropping patterns on saline alkali soil and improve the yield and quality of grass in saline alkali land, this study selected representative grasses of Poaceae and Leguminosae in moderate to severe saline alkali land in the Yellow River Delta region as research objects, and compared and analyzed the effects of oat grass(Arrhenatherum elatius(L.) Presl) and alfalfa(Medicago sativa L.) monoculture, three row intercropping, and five row intercropping on grass quality and soil quality.Three row intercropping refers to the alternating planting of oat grass and alfalfa every three rows, and the same applies to five row intercropping.The results are as follows.The intercropping mode of grass and beans could significantly improve the yield and quality of forage.The annual yield of five row intercropping of forage was 4 447.133 kg·hm^-2,slightly higher than that of three row intercropping, and 7.91% and 9.57% higher than that of oat grass and alfalfa monoculture.The protein content of oat grass under five row and three row intercropping modes was 3.74% and 5.22% higher than that of monoculture, respectively.In terms of soil quality, the pH of the grass plot significantly decreased under intercropping mode, with the most significant decrease at 10-30 cm, and promoted the increase in mass fractions of organic matter, nitrate, and ammonium nitrogen in the soil.Alfalfa monoculture had the most significant increase in mass fractions of organic matter, nitrate, and ammonium nitrogen.In summary, intercropping oat grass and alfalfa in saline-alkali land is beneficial for improving the yield and quality of forage, and also has a certain promoting effect on land quality.