关键词: 土壤重金属, 农田, 中国东部, 空间变异, 重金属污染评价

Abstract: With the rapid development of economy and society, heavy metal contamination of cultivated soil has seriously influenced food security and human health. Based on the data of heavy metal in cultivated soil in eastern China collected from documents, the degree of heavy metal pollution of cultivated land in eastern area was evaluated, by means of semi-variogram analysis, Kriging interpolation, single factor pollution index, Nemerow comprehensive pollution index, and geoaccumulation index. The conclusions showed as follows: the pollution of Pb was the most serious one; the mean value of Hg was 2.8 times higher than background value of element Hg in Chinese soil. Almost 30% of eastern area was under the middle pollution level. The pollution of Cd was the second serious one, and results of semi-variogram analysis indicated Cd was the most influenced by human activities. In addition, the mean value of Cd was 2 times higher than the background value of Cd in Chinese soil. Over 50% of eastern area was under the firing line of Cd pollution. Cultivated soil in Guangdong province may be the key region of heavy metal integrated pollution because Nemerow comprehensive pollution index in Guangdong was the highest (0.854) and Kriging interpolation revealed high value area of As, Cd, Hg, Pb distributed in Guangdong province.

Key words: heavy metal of soil, cultivated land, eastern China, spatial variation, evaluation of heavy metal pollution