基于GIS和地统计学的滩涂增养殖区沉积物重金属污染评价

Pollution assessments on heavy metals in sediment in inter-tidal aqua-farm area based on GIS and geostatistics

采用地理信息系统(G IS)、地统计方法和潜在生态危害指数法相结合的方法,对江苏省如东滩涂增养殖区沉积物中的Cu、Zn、Cd、Pb进行了综合定量化污染评价研究。结果生成了沉积物重金属综合生态危害风险指数空间分布图,发现整个调查区域都属轻微生态危害,且靠近排污口的区域生态危害程度较重,与实际情况相符。说明使用G IS和地统计学方法可正确、直观地反映沉积物重金属的污染状况,为其在滩涂增养殖区污染评价中的实际运用提供了思路。

The comprehensive quantitative pollution assessments were carried out by the geographic information system（GIS）,geo-statistics and potential ecological risk index methods on copper,zinc,cadmium and lead in sediments in Rudong intertidal aqua-farm area of Jiangsu Province.The results showed a spatial distribution of comprehensive ecological risk index for heavy metals in sediments.It was found that the whole survey area belonged to the light ecological risk and the ecological risk level of the region near the sewage outfall was heavier in the map,which consistent with the actual situation.It proved that the use of GIS and geo-statistics methods could reflect the situation of the heavy metals pollution in sediments correctly and intuitively.Thus,it provided a guideline for the practical application of the heavy metal pollution assessments.