College of Natural Resources and Environment/Key Laboratory of Agro-Environment in the Tropics of Agriculture Ministry of the People's Republic of China/Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agricultural University, Guangzhou, 510642, China.
College of Agriculture, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
Sci Rep. 2020 Jul 22;10(1):12244. doi: 10.1038/s41598-020-69165-x.
To analyze the concentration, spatial distribution patterns, and ecological risks of heavy metals (Cd, Cr, Pb, As, Cu, Ni and Co), 272 topsoil samples (0-20 cm) were collected from paddy fields in Fujian province in July 2017. The results revealed that the mean concentration of all heavy metals exceeded the background values in Fujian province, with the mean concentration of Cd being 5.20 times higher than its background. However, these concentrations of heavy metals were lower than their corresponding national standards (GB 15618-1995). Spatially, for Cd, the high concentration areas were located mainly in southeast of Sanming city and northeast of Quanzhou city. For Pb and As, the places of highest concentration were mainly in southeast of Quanzhou city and Zhangzhou city, and the main areas of high Ni concentration were distributed southeast of Nanping city. The geo-accumulation index ([Formula: see text]) of Cd and As were indicative of moderate contaminations, and the index of Co, Cu and Cr suggested that these were practically uncontaminated. The nemerow integrated pollution index ([Formula: see text]) showed that the entire study area was prone to a low level of pollution, but at the county level, Yongcun county and Zhaoan county are in an warning line area of pollution. According to the potential ecological risk ([Formula: see text]), the ecological risk belongs to the low risk of paddy fields in Fujian province. However, Cd should be given attention ([Formula: see text] = 25.09), as it contributed to the majority of potential ecological risks in Fujian province.
为分析重金属（Cd、Cr、Pb、As、Cu、Ni 和 Co）的浓度、空间分布模式和生态风险，2017 年 7 月从福建省稻田采集了 272 个表层土壤样本（0-20cm）。结果表明，所有重金属的平均浓度均超过福建省背景值，Cd 的平均浓度比背景值高 5.20 倍。然而，这些重金属浓度低于相应的国家标准（GB 15618-1995）。从空间上看，Cd 的高浓度区主要分布在三明市东南部和泉州市东北部。Pb 和 As 的高浓度区主要分布在泉州市和漳州市东南部，高 Ni 浓度区主要分布在南平市东南部。Cd 和 As 的地积累指数 ([Formula: see text]) 表明存在中度污染，Co、Cu 和 Cr 的指数表明基本无污染。内梅罗综合污染指数 ([Formula: see text]) 表明整个研究区易受低水平污染，但在县级层面上，永村县和诏安县处于污染预警线区域。根据潜在生态风险 ([Formula: see text])，福建省稻田的生态风险属于低风险。然而，Cd 应引起关注 ([Formula: see text] = 25.09)，因为它导致了福建省大部分潜在生态风险。
