黑龙江省典型蔬菜大棚土壤重金属污染评价

Evaluation of Heavy Metals Pollution of Typical Vegetable Greenhouse Soils in Heilongjiang Province

为探索黑龙江省典型大棚土壤中重金属Cu、Zn、Cd的污染状况,采用单因子与限值比较、综合因子指数法和相关系数法对污染情况进行综合评价。结果表明:除肇东2a、肇东6a棚龄无污染外,其他大棚均有不同程度的污染;五常8a、肇东11a棚龄属轻度污染,其他棚龄均达中污染程度,而且五常大棚综合污染程度较肇东严重。Cu、Zn、Cd与棚龄之间的相关系数显示,各元素与棚龄之间存在着相关关系。五常大棚Cu、Zn、Cd与棚龄呈显著相关(P<0.05),相关程度Cu>Cd>Zn;肇东大棚Cu、Zn、Cd与棚龄之间达极显著相关(P<0.01)。

In this paper, the comparative methods of single factor and limited value, comprehensive factor index and correlation coefficient analysis were used to investigate the pollution status of Cu, Zn and Cd in typical vegetable green- house soils of Heilongjiang province.. The results showed that the different levels of polluted soils in greenhouse were observed, but the soils in 2 and 6 years old greenhouse were not polluted in Zhaodong city. The slightly polluted soils were found in 8-year-old greenhouse of Wuchang city and 11-year-old greenhouse of Zhaodong city, While the other greenhouse soils were all polluted moderately. Moreover, the pollution degree of greenhouse soil in Wuchang city was harder than those in Zhaodong city. There were significant（P0.05） and extremely significant （P0.01）correlationships between Cu, Zn and Cd contents and greenhouse ages in Wuchang city and Zhaodong city, respectively, and the corre- lated degree was CuCdZn in Wuchang city.