GIS支持下农田土壤速效养分评价、分级与推荐施肥

Available Nutrient Evaluation,Classification andRecommended Fertilization of Field Soil Based on GIS

利用GIS对湖北省鄂州市杜山镇耕地速效养分进行了评价研究 ,用全球卫星定位系统 (GPS)定位 ,以 5 0 0m× 5 0 0m网格法取得表层土样 134份 ,分析样品有机质、碱解氮、速效磷、速效钾、pH等 5项指标 ,用综合评分法将耕地速效养分划分为 5个肥力等级并分析讨论了土壤速效养分分布状况及其成因。同时 ,还对基于速效养分等级的推荐施肥方法进行了探索。

Researches to appraise field soil available nutrient was conducted with GIS (geographical information system) in Dushan Town, Ezhou City, Hubei Province. Located by GPS (global positioning system), 134 field soil samples from the fields' surface to 15 cm depth were collected on 500 m by 500 m grids. Five soil chemical properties such as organic matter,available N,available P,available K and pH were chosen and were determined as well as factors to evaluate the grade of soil available nutrient . Based on this,field soil available nutrient was classified into five grades with the comprehensive scoring method.The distribution of field soil nutrient and its formation were also discussed.Conidering the viriation of soil fertility , a probe into an improved method of recommended fertilization was also carried out.