【摘要】 Kriging法对7种重金属含量空间局部插值后,参照国家和地方重金属污染标准,对迁安市农田土壤表层重金属含量进行单项污染指数和综合污染指数评价和基于GIS技术的评价结果分级。结果显示,Cd、Hg、As、Cr和Zn单项污染指数均未超标,Cu和Ni单项污染指数在北部山区分别有0.18%和0.10%面积超标,综合污染指数有11.80 km2表层土壤污染达到警戒限,所占总面积百分比为0.98%,其余地区污染等级为安全。以期为优势农产品基地建设提供参考。更多还原

【Abstract】 Kriging was employed to interpolate maps in order to investigate seven heavy metals contents in farmland soils in Qian’an City.In consultation of national and local pollution control standards for the heavy metal contents,single and comprehensive pollution indexes were applied to assess the heavy metal contents on topsoil in farmland of Qian’an City.Then assessment results were graded by GIS technique.The results showed that single pollution indexes of Cd,Hg,As,Cr and Zn were under the standards,but single pollution indexes of Cu and Ni were exceeded the standards,by 0.18% and 0.10% respectively,in terms of area percentage.Contamination grading of 11.80 km2 topsoil with comprehensive pollution index had reached the warning limit,occupying 0.98% of total area.However,the contamination grading of the rest area was safe.The case research lays the theoretical basis for the regional predominant crop layout.更多还原