广西某农灌蔗区土壤重金属含量及污染评价

【目的】开展广西某农灌甘蔗产区表层土壤重金属含量调查,为甘蔗重金属生物有效性研究、合理种植及确保甘蔗质量提供参考依据。【方法】对广西某农灌甘蔗产区蔗田26个表层土壤样品重金属Cd、As、Pb、Cr、Cu、Zn和Ni的含量进行调查分析,采用单因子污染指数与内梅罗综合污染指数相结合的方法和潜在生态危害指数法对研究区域蔗田重金属的污染及其生态风险进行评价。【结果】研究区蔗田土壤Cd、As、Pb、Cr、Cu、Zn、Ni 7种重金属的平均含量分别为0.056、10.3、23.7、55.9、17.8、33.7、18.9 mg/kg,均未超过国家土壤环境质量二级标准。经潜在生态危害指数分析得知,重金属潜在生态危害由强至弱依次为：Cd〉As〉Ni〉Cu〉Pb〉Cr〉Zn。【结论】该农灌蔗区蔗田土壤重金属污染风险程度较低。

Evaluation of heavy metal contamination to the irrigated sugarcane farmland soil in Guangxi

【Objective】The contents of heavy metals in irrigated sugarcane soil of Guangxi were investigated to pro-vide references for improving bioavailability, planting management and quality of sugarcane. 【 Method 】 In the irrigated sugarcane soil of Guangxi,26 surface soil samples were collected,and the contents of Cd,As,Pb,Cr,Cu,Zn and Ni were analyzed. Besides,the pollution degree and ecological risk of heavy metals of the studied sugarcane soil were analyzed by means of single pollution index,comprehensive pollution index and potential ecological risk index. 【Result】The results showed that the mean contents of Cd,As,Pb,Cr,Cu,Zn and Ni in topsoil were 0.056,10.3,23.7,55.9,17.8,33.7 and 18.9 mg/kg,respectively. The contents of seven heavy metals did not exceed the National Soil Environmental Quality Standard for soil. Moreover,the results of potential ecological risk index showed that the potential ecological risk degree of heavy metals was characterized by order of Cd As Ni Cu Pb Cr Zn. 【Conclusion 】The pollution risk degree of heavy metal in irrigated sugarcane area soil is low.