耕地质量地球化学评价及应用研究——以重庆市荣昌区为例

Geochemical Assessment and Applications of Cultivated Land——Taking Rongchang District,Chongqing City,China as an Example

基于Arcgis平台,以耕地图斑为评价单元,对重庆市荣昌区耕地质量进行了地球化学评价及其应用研究。结果表明,研究区耕地土壤质量较好,地球化学等级以中等为主,占耕地总面积的74.44%,优质和良好等级占24%。土壤养分综合等级以中等为主,有机质、氧化钙和磷元素较缺乏,钾、硫、锌等多种元素较丰富。土壤环境质量总体较好,清洁和轻微污染区面积较大,轻度至重度污染区不足1%,土壤污染主要由Cd元素引起。耕地质量地球化学评价可广泛应用于耕地分等定级、基本农田划定、土地整治和农业生产活动中。

Based on Arcgis platform,this paper evaluated geochemical grades of cultivated land of Rongchang District,Chongqing City,China and discussed its applications. Results show that the quality of cultivated land is in good condition,with medium geochemical grade accounting for 74. 44% of the total area and good-excellent grade accounting for 24%. Integrated nutrient level is mainly medium,in lack of organic matter,calcium oxide and phosphorus,and rich in potassium,sulfur,zinc and other elements. The soil environment quality is generally good,and the area of clean and slightly polluted cultivated area is larger. The mild to severe polluted is less than 1% which is mainly caused by Cd. The geochemical evaluation of cultivated land quality can be widely used in grading of cultivated land,delimitation of basic farmland,land improvement and agricultural production.