江西丰城董家——尚庄地区土地质量地球化学评估方法

Geochemical assessment of land quality in Dongjia-Shangzhuang area,Fengcheng City in Jiangxi Province

江西丰城董家—尚庄土地质量评估是在土壤理化性质的基础上,根据K、Ca、Fe、Mn、Na、As、Cd、Se、F、I、p H及有机质等指标,运用层次分析法和隶属函数建立土地质量地球化学评估模型对其进行评估。结果表明:优质、优良、良好、中等土地面积分布分别占总面积的0.2%、74.9%、9.3%、15.6%,反映土地质量地球化学综合分等有明显差异。优良以上的土地占该区土地面积的75.1%,大面积分布于研究区,是发展绿色无公害农产品的最佳区域;良好等级的土地位于研究区中部,适宜发展一般性农业,应加强保护与合理利用;中等土地分布于研究区东部铁路沿线及赣江冲积平原,应避免种植粮食、蔬菜等食用作物。

The paper takes the physical and chemical properties of soil as the object of geochemical assessment of land quality in Dongjia-Shangzhuang, Fengcheng in Jiangxi Province. The geochemical assessment model of land quality is built upon the analytic hierarchy process and membership function, taking the quality index of K, Ca, Fe, Mn, Na, As, Cd, Se, F, I, organic matter, and pH into account. The result shows that the overall quality level of land in the study area can be divided into 3 grades ： high grade （ 0. 2% ） , excellent （ 74,9% ）, good （ 9.3% ）, moderate （ 15.6% ）, which indicates a notable difference in graduation of land quality geochemical assessment. Land of high grade and excellent level （ 75.1% ） , making up most part of the study are, can be used to grow green and harmless agricultural products ; Land of good level at the central area is appropriate to develop general agricultural with reasonable utilization and effective preservation; Land of moderate level along the eastern railway and the Ganjiang alluvial plain, must avoid grain, vegetables and other food crops.