城市化进程下土壤环境地球化学评价

Geochemical Evaluation of Soil Environment Under Urbanization Process

该文通过对广州市从化南部地区进行土壤环境地球化学评价,研究了元素分布与地质背景、地形地貌、成土母质、土壤类型等之间的关系,参照相关环境质量标准要求,评价了调查区土壤环境质量现状,圈定了符合绿色无公害生产的区域,研究发现区内出露地层较多,不同类型风化土壤受成土母质的影响较大,元素含量分布范围较广泛。研究区中度污染及以上土壤面积为2.45 km2,占研究区面积的3.06%,其分布与地质背景关系不密切,与人类活动有关;一级和二级土壤面积为77.55 km2,占调查区面积的96.94%,区内适宜绿色食品生产的面积为52.7 km2,占研究区土地面积的65.9%,结论表明区内大部分区域适宜无公害农产品种植和绿色食品生产。

Through the evaluation of soil environmental geochemistry in the southern part of Conghua,Guangzhou,the relationship between element distribution and geological background,topography,soil parent material and soil type were studied.According to the requirements of relevant environmental quality standards,the status of soil environmental quality in the survey area were evaluated and the areas in line with green pollution-free production were delineated.The study found that there are many exposed stratas in the area and different types of weathered soils are greatly affected by the parent material,lead to the content of elements is widely distributed.The area of moderately polluted soil and above is 2.45 km2,accounting for 3.06%of the total area of the study area.Its distribution is not closely related to the geological background,but related to human activities.The primary and secondary soil areas are 77.55 km2,accounting for 96.94%of the survey area.The areas suitable for green food production in the zone are 52.7 km2,accounting for 65.9%of the study area.The conclusion indicates that most areas in the region are suitable for the cultivation of pollution-free agricultural products and green food production.