Song Bo, Yang Zi-Jie, Zhang Yun-Xia, Wang Fo-Peng, Zhou Lang, Li Li, Zhong Xue-Mei
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China.
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China.
Huan Jing Ke Xue. 2018 Apr 8;39(4):1888-1900. doi: 10.13227/j.hjkx.201707238.
To understand the distribution and risk of soil cadmium (Cd) in the Xijiang River drainage basin in Guangxi, a total of 2512 soil samples were collected nonferrous metal mining area, farmland (paddy soils and dryland soils) and the background soils, in the Xijiang River drainage basin in Guangxi.The results showed that Cd concentration was 0.514 mg·kg in background soils significantly higher than previously resulted(0.148 mg·kg)and that in Guangxi background soil(0.267 mg·kg). The geometric average concentration of Cd in dryland soils, paddysoils and mining soils was 0.559, 0.787, 5.71 mg·kg, respectively, which were significantly higher than background soils. The Cd concentration exceeded the background soils and baseline by 51.2% and 35.2% in dryland soil, 66.7% and 39.6% in paddy soil, 77.8% and 71.4% in mining soil, high Cd concentration occurred in the Nandan County, Dahua County, Duan County, Huanjiang County and Yizhou City, as well as Liujiang County, These regions have developed severe and even extremely serious pollution, medium-high pollution accumulation and higher-extremely high potential ecological risks. The Cd-pollution in soils in agricultural and mining soils in upstream of Xijiang River in Guangxi is serious, due to mining activities and high Cd geological background. People in the mining area and surrounding areas who live on local crops, vegetables, may expose to the Cd-pollution. It is recommended to further develop a Cd risk assessment through a soil-plant-human system, taking appropriate measures to control risk.
为了解广西西江流域土壤镉（Cd）的分布及风险，在广西西江流域的有色金属矿区、农田（水田和旱地土壤）及背景土壤中，共采集了2512个土壤样本。结果表明，背景土壤中Cd浓度为0.514mg·kg，显著高于先前结果（0.148mg·kg）以及广西背景土壤（0.267mg·kg）。旱地土壤、水田土壤和矿区土壤中Cd的几何平均浓度分别为0.559、0.787、5.71mg·kg，均显著高于背景土壤。旱地土壤中Cd浓度超过背景土壤和基线的比例分别为51.2%和35.2%，水田土壤中为66.7%和39.6%，矿区土壤中为77.8%和71.4%，高Cd浓度出现在南丹县、大化县、都安县、环江县、宜州市以及柳江县，这些地区已出现严重甚至极严重污染、中高污染累积以及较高-极高潜在生态风险。由于采矿活动和高Cd地质背景，广西西江上游农业土壤和矿区土壤中的Cd污染严重。矿区及周边以当地作物、蔬菜为生的居民可能暴露于Cd污染中。建议通过土壤-植物-人体系统进一步开展Cd风险评估，并采取适当措施控制风险。
