The effects of several selected forages in improving the quality of soil, preventing soil degradation and reducing soil and water erosion were investigated in barren land in karst area. A way helping to solve the deficiency problem of forage resource in some karst areas was found. The growth process of three selected forages, including Guimu No. 1 and Wedelia chinensis and Tephrosia Candida, were also investigated between the year of 2008 and 2010. The results showed that Guimu No. 1 was conductive to the increase of soil surface coverage .organic matter content .total nitrogen content, total phosphorus content, available nitrogen content, available phosphorus content and available potassium content, so as to improve soil quality and prevent soil degradation. It also showed that Wedelia chinensis had the problem of exclusion and Tephrosia Candida was inferior to the other forages in improving soil nutrients content. The relations between these soil nutrients were also examined. The correlation analysis of the nutrients showed highly correlated relations after the forages were planted,for example,organic matters had significant correlation with total nitrogen,total phosphorus,available nitrogen and available potassium in the 0.01 level%研究了岩溶区荒地及长有非饲料用草的土地上,几种优选牧草种植在改善土壤质量、防止土壤退化、减少水土流失方面的作用,从而找到一条拓宽岩溶区许多地方牧草资源不足的有效途径.2008 ～ 2010年,项目组研究了桂牧1号、蟛蜞菊、山毛豆3种优良牧草品种在岩溶区的种植过程.结果表明,桂牧1号有利于土壤盖度的增加,有利于有机质含量的增加,有利于全氮、全磷、有效氮、有效磷、有效钾含量的增加,对改善土壤质量、防止土壤退化有良好的作用；蟛蜞菊排它性较强,也可以很好地改善土壤；山毛豆改善土壤的效果稍次于前2种.同时,研究了土壤营养元素全氮、全磷、有效氮、有效磷、有效钾含量之间的相关性.经相关性分析发现,种植牧草后多种营养元素相关性较高,有机质与全氮、全磷、有效氮、有效钾含量都在0.01水平显著相关.
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