种植牧草在白浆土改良中的作用  

Role of planting grass in albic soil amelioration

作　　者：于德清[1] 丁庆堂[1] 关熙铭 武志杰[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110015

出　　处：《应用生态学报》1993年第1期37-41,共5页Chinese Journal of Applied Ecology

基　　金：国家"七五"科技攻关项目

摘　　要：研究了农田生态系统中引种紫花苜蓿对土壤生态环境的影响。结果表明,紫花苜蓿种植3年以后,白浆土的通气孔隙增加2.37—5.34％,渗透系数增加0.7—5.5倍,土壤有机碳增加0.349—0.600％,作物产量平均提高25％。种植苜蓿比单种作物的产投比高0.36—0.39。The effect of alfalfa introduced in farmland ecosystem on soil eco-environment is studied in this paper. Experimental results show that after three years planting of alfalfa, soil aeration increases by 2.37—5.34％, soil organic C content by 0.349—0.600％, average crop yield by 25％, and filtration coefficient by a factor of 1.7—6.5. The ratio output and input of planting alfalfa is 0.36—0.39times higher than planting crop alone.

关 键 词：紫花苜蓿 牧草 土壤生态学 

分 类 号：S154.4[农业科学—土壤学]