以黄土丘陵区具有代表性的禾本科及豆科牧草无芒雀麦和沙打旺为材料，研究其对川台地土壤腐殖质含量和组成、有关营养元素及后茬作物产量的不同影响。结果表明，种植禾本科及豆科牧草均能提高土壤中腐殖质及氮磷营养的水平，其中禾本科牧草效果较豆科牧草更为明显。它们对土壤中微量元素的影响因各自对营养元素的利用程度而异。两种牧草样地后茬作物的产量以沙打旺为高，无芒雀麦不宜与禾本科作物轮作。 This paper studied the different effects of humus content and composition on soil humus content, nutrients and subsequent crop yield in the grassland of Loess Hilly Region and leguminosae Bromus inermis and Astragalus adsurgens. The results showed that both gramineous and leguminous plants could improve the humus and nitrogen and phosphorus nutrition in the soil, and the gramineous pasture was more effective than the legume pasture. Their effects on soil trace elements vary depending on their level of nutrient use. After two kinds of forage plots crop production to Astragalus as high, Bromegrand unfit and gramineous crops rotation.