Zhang Xiuying, Chen Dongmei, Zhong Taiyang, Zhang Xiaomin, Cheng Min, Li Xinhui
Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing University, Nanjing, 210023, China,
Environ Sci Pollut Res Int. 2015 Apr;22(7):4932-41. doi: 10.1007/s11356-014-3892-6. Epub 2014 Dec 9.
Cadmium (Cd) concentration in arable soil has drawn broad public attention due to its direct effect on Cd concentration in food. However, there have been few studies of surveying Cd accumulation on the national scale in China. This paper collected 486 studies of Cd concentrations in Chinese arable soil. The results showed that the average Cd concentration was 0.27 mg/kg, higher than its background value, indicating that Cd had been introduced into arable soil by human activity. The Cd concentrations in areas of mining and smelting, urban areas, and areas irrigated by wastewater were obviously higher than that in remote areas. Spatially, Cd concentrations were lower in the north than those in the south, and many hotspots existed throughout China due to mining and smelting activities. Most Cd in the arable soil were accumulated from external sources in all investigated provinces except Ningxia Hui Autonomous Region.
由于镉（Cd）对食物中镉含量有直接影响，耕地土壤中的镉浓度已引起公众广泛关注。然而，在中国进行全国范围内镉积累调查的研究很少。本文收集了486项关于中国耕地土壤镉浓度的研究。结果表明，镉的平均浓度为0.27毫克/千克，高于其背景值，这表明镉已通过人类活动进入耕地土壤。采矿和冶炼区、城市地区以及用废水灌溉地区的镉浓度明显高于偏远地区。在空间上，北方的镉浓度低于南方，并且由于采矿和冶炼活动，中国各地存在许多热点地区。除宁夏回族自治区外，所有被调查省份的耕地土壤中大部分镉都是从外部来源积累的。
