吉林黑土中Cd、Pb、As的空间分布及潜在生态风险

研究了吉林省黑土区耕层土壤(0～20cm)中Cd、Pb、As含量的分布特征及其潜在生态风险.结果表明,煤矿区周围、公路旁和城郊为农田黑土Cd、Pb、As的高含量分布区,煤矿区周围土壤Cd、Pb、As均具有明显的累积效应,公路旁和城郊的土壤外源Pb进入量较大.采用Muller地累积指数法和Hakanson潜在生态危害指数法得出的潜在生态风险评价结果表明,煤矿区土壤Cd具有很高的潜在生态风险,As具有一般风险;各采样区的Pb含量均呈现一般风险.总体而言,煤矿区土壤具有一般潜在风险,而公路旁和城郊土壤均具有低潜在生态风险.关键词:黑土;Cd;Pb;As;潜在生态风险;吉林省

Spatial distribution and potential ecological risk of Cd, Pb, As in Jilin black soil

The distribution of Cd, Pb, As contents in Jilin Province black soil area ploughing layer soil (0~20cm) was studied. Cd, Pb and As contents were higher around the mine area and in the suburb and roadsides. Three elements accumulated markedly around the coal mine, and there were relatively higher inputs of Pb in the suburb and roadsides. The obtained potential ecological risk appraising adopting Muller land accumulation index method and Hakanson potential ecological risk index method, showed that Cd in the coal mine area possessed very high potential ecological risk and As possessed general risk; the Pb contents of each sampling area appeared general risk. In general, the farmland soil of coal mine area possessed general potential risk, while areas near the highways and suburb farmland all possessed low potential ecological risk.