广东省江门市崖门镇天然富硒土地划定

Natural Selenium Rich Land Delineation in Yamen Town, Jiangmen City, Guangdong Province

摘要: 根据《天然富硒土地划定与标识》(DZ/T 0380-2021)，以1:50,000土地质量地球化学调查数据为基础，对广东省江门市新会区崖门镇北部研究区范围内土地进行天然富硒土地划定。结果表明，崖门镇北部研究区表层土壤硒含量均值为0.76 mg/kg，局部地块Pb、Hg元素超过农用地土壤污染风险筛选值，4件样品总大肠菌群，2件样品pH值超过绿色食品产地环境质量标准值，综合肥力达到I级肥力要求的地块面积为5.6平方千米。综合评价后，划定天然富硒地块总面积为74,925亩，其中绿色富硒土地8400亩，无公害富硒土地64,392亩，一般富硒土地2123亩。根据崖门镇实际情况，建议加快推进标准建设和区域富硒农产品品牌打造。

Abstract: According to the “Classification and Identification of Natural Selenium rich Land” (DZ/T 0380-2021), based on 1:50,000 land quality geochemical survey data, the land within the northern research area of Yamen Town, Xinhui District, Jiangmen City, Guangdong Province is classified as natural selenium rich land. The results showed that the average selenium content in the surface soil of the northern study area of Yamen Town was 0.76 mg/kg, and the Pb and Hg elements in some plots exceeded the screening value for soil pollution risk in agricultural land. The total coliform group of 4 samples and the pH value of 2 samples exceeded the environmental quality standard value for green food production areas. The area of the plot with comprehensive fertility meeting the requirements of Grade I fertility was 5.6 square kilometers. After comprehensive evaluation, the total area of natural selenium rich land is designated as 74,925 acres, including 8400 acres of green selenium rich land, 64,392 acres of pollution-free selenium rich land, and 2123 acres of general selenium rich land. Based on the actual situation in Yamen Town, it is recommended to accelerate the construction of standards and the branding of selenium rich agricultural products in the region.