固氮植物篱改善退化坡耕地土壤养分状况的效果  

EFFECT OF CONTOUR HEDGEROW SYSTEM OF NITROGEN FIXING TREES ON SOIL FERTILITY IMPROVEMENT OF DEGRADED SLOPING AGRICULTURAL LANDS

作　　者：孙辉[1] 唐亚[1] 陈克明[1] 何永华[1] 

机构地区：[1]中国科学院成都生物研究所,成都610041

出　　处：《应用与环境生物学报》1999年第5期473-477,共5页Chinese Journal of Applied and Environmental Biology

基　　金：国际山地中心ATSCFS项目;中科院成都地奥科学基金

摘　　要：在四川宁南县坡地农业实验站对固氮植物篱在坡耕地上防治水土流失和改良土壤的效果进行了长期定位研究．结果表明等高固氮植物篱在防治土壤养分退化方面效果明显：与传统顺坡种植（ＣＫ） 相比，在坡耕地上培植新银合欢（Ｌｅｕｃａｅｎａｌｅｕｃｏｃｅｐｈａｌａ） 等高植物篱和山毛豆（Ｔｅｐｈｒｏｓｉａ ｃａｎｄｉｄａ）等高植物篱，正常耕作３～６ ａ 后，作物带土壤全氮可增加８０％ ～１３０％ ，有机质增加２０％ ～４０％ ，有效钾和阳离子交换量等养分均有不同程度增加．由于肥力状况改善，等高植物篱处理的农作物产量也明显高于ＣＫ．Contour hedgerow system of nitrogen fixing plants has been under test and modification since 1991 in Ningnan County of southwestern Sichuan to explore its appropriateness in the subtropical areas and its effect on erosion control and soil amelioration. The preliminary results showed that contour hedgerows of Leucaena leucocephala and Tephrosia candida were effective on soil fertility improvement of degraded sloping farm lands and preventing farmlands from further degradation. Compared to the control, in the treatments with hedgerows of nitrogen fixing plants the topsoil organic matter content was increased by 20%～40%, total nitrogen by 80%～130% within 3～6 a, and exchangeable potassium and cation exchange capacity were improved. Crop yield was also increased due to fertility improvement. The nitrogen fixing hedgerows are the on site long term nutrient resources for providing green manure and mulch materials to the degraded farmland soils. The results indicate that contour hedgerow system is a practical and profitable bio technique for the management of the sloping agricultural lands.

关 键 词：固氮植物篱 坡耕地 土壤培肥 持续发展 

分 类 号：S156.93[农业科学—土壤学] S154.381[农业科学—农业基础科学]