滇中耕地土壤重金属污染现状及潜在生态风险评价

Current Status of Heavy Metal Pollution and Potential Ecological Risk Assessment of Cultivated Land in Central Yunan

2018年3月,研究人员对滇中某坡耕地进行实地调查和采样检测,运用潜在生态风险指数法对该坡耕地生态风险进行评价。结果表明,铅污染情况最严重,最大超标达123.99倍,平均超标达38.30倍。经ArcGIS绘图,研究发现,铅对很强、较强、中度和轻度等4个RI风险等级区域的贡献率分别为89.61%、84.72%、73.96%、47.31%,远大于其他重金属元素的贡献率。铅是该坡耕地的主要污染因子和主要潜在生态风险因子。

In March 2018,researchers conducted field surveys and sampling tests on a slope farmland in central Yunnan,and used the potential ecological risk index method to evaluate the ecological risk of the slope farmland.The results showed that the lead pollution was the most serious,with the maximum exceeding the standard by 123.99 times and the average exceeding the standard by 38.30 times.Based on ArcGIS mapping,the study found that the contribution rate of lead to the four RI risk-level areas,namely,strong,strong,moderate,and mild,was 89.61%,84.72%,73.96%,and 47.31%,respectively,which was much greater than the contribution rate of other heavy metal elements.Lead is the main pollution factor and the main potential ecological risk factor of the slope farmland.