基于土壤质量地球化学评价的污染源追溯及研究——以某地为例

Traceability and research of pollution sources based on geochemical assessment of soil quality ——A case study of one place

通过1:50 000土壤质量地球化学调查、采样和分析测试,获得了汉江流域某县城周边长期耕种农田的17项指标土壤地球化学数据,研究其分布特征,依据相应规范进行土壤质量评价,并对污染源进行追溯和分析。结果显示,区内土壤养分以较丰富为主,其余为中等,未出现大面积的营养缺乏现象。区内土壤环境质量整体较差,在元素Cd的影响下,有大片区域出现轻微污染,且有小部分农田已到达到重度污染等级。区内土壤质量总体较好,县城周边农田出现了大面积三等及以上区域,占比29.93%。区内严重污染区域在空间上与灌溉水高度相关,沿其追溯逐渐发现污染集中区域,并通过进一步的采样和分析研究工作逐步将污染源锁定。

Through 1:50 000 soil geochemical survey,sampling and analysis test,the soil geochemical data of 17 indexes of long-cultivated farmland around a county in the Hanjiang River Basin were obtained.The distribution characteristics of soil geochemical data were studied.The soil quality was evaluated according to the corresponding regulations,and the pollution sources were traced and analyzed.the results showed that the soil nutrients in the area were mainly rich,the rest were medium,and there was no large area of nutrient deficiency.the overall quality of soil environment in the area is poor.Under the influence of element Cd,there are large areas with slight pollution,and a small part of farmland has reached the level of severe pollution.the soil quality in the area is generally general.Under the influence of soil environmental factors,there appeared a large area of third-grade or above farmland around the county seat,accounting for about 29.93% of the total area.the severely polluted areas in the area are highly related to irrigation water in space,and the concentrated areas of pollution are gradually found along the trace,and the pollution sources are gradually locked through further sampling and analysis research work.