贵州省石漠化综合治理人工种草土壤肥力综合评价

Effect of Grass Plantation on Soil Fertility in Rocky Desertification Comprehensive Management in Guizhou

为给石漠化综合治理工程效益评价提供参考依据,采用野外调查和室内分析相结合的方法,对贵州省盘县哮天龙小流域和晴隆县孟寨小流域坡耕地、人工草地和天然草地3种土地利用方式下土壤化学性状进行综合评价研究。结果表明:1)在坡耕地实施人工种草可有效提高土壤全氮、碱解氮、全磷含量和有机质含量,但有效磷、全钾和速效钾含量降低;2)土壤肥力综合指数值依次为天然草地(4.126)>人工草地(3.895)>坡耕地(3.691),人工草地土壤肥力综合指数值(FI)是坡耕地的1.06倍。坡耕地实施人工种草后,可有效改善土壤的综合肥力状况。

The chemical property soil under three land utilization patterns of slope farmland,grass plantation and natural grass was evaluated by field survey and laboratory analysis in Xiaotianlong small watershed of Pan County and Mengzhai small watershed of Qinglong County to provide a reference for benefit evaluation of rocky desertification comprehensive management project. Results：1） Grass plantation on slope farmland effectively increases the content of total N,available N,total P and organic matter in soil but reduces the content of available P,total K and rapid available K in soil;2）The comprehensive index value of soil fertility is natural grass（4.126）〉grass plantation（3.895）〉slope farmland（3.691）and the comprehensive index value of soil fertility of grass plantation is 1.06 times that of slope farmland. Therefore,implementing grass plantation on slope farmland can improve soil comprehensive fertility effectively.