摘要
Abstract
The statistical characteristics and annual variability of heavy metals As, Hg, Cu, Cd, Cr, and Pb in Beijing agricultural soil were presented, on the basis of continuous yearly monitoring for the period of 2005 to 2009.Heavy metals were evaluated using the single-factor pollution index and based on the national environmental quality standard for soils.The results showed a growth of Hg and Cr in Beijing agricultural soil from 2005 to 2009, while the concentration of Hg was 0.053, 0.066, 0.070, 0.072 mg·kg-1 and 0.079 mg·kg-1, and Cr was 50.0, 52.4, 55.3,58.6 mg·kg-1 and 62.1 mg· kg-1, respectively.There was no significant trend for other metals.Furthermore, combined statistical characteristics of metals and the evaluated results of single-factor index, Cd was found to accumulate in soil the most, followed by Hg, Cu, Pb, Cr and As.These results indicted the environmental quality of Beijing agricultural soil was mostly clean and safe, except several samples were polluted by Hg and Cd.关键词
北京/农田土壤/重金属/年际变化/综合评价Key words
Beijing/ agricultural soil/ heavy metals/ annual variability/ evaluation分类
资源环境
