College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China.
Environ Monit Assess. 2018 Sep 27;190(10):611. doi: 10.1007/s10661-018-6995-6.
In recent years, the soil ecosystem in China has been increasingly polluted by heavy metals. As such, this paper investigated the pollution degree and spatial distribution of available heavy metals and determined their sources in the paddy soil of red region in Hunan Province of China. A total of 80 topsoil samples were collected (0-20 cm) from the study area, and their spatial distribution and sources were analyzed using geostatistical and multivariate analysis. The results showed that the contents of available Cu, Zn, Ni, Cr, Cd, As, and Pb in the soil were 1.652, 1.057, 0.304, 0.747, 0.139, 0.295, and 6.348 mg/kg, respectively. Compared to soil background reference contents, all tested available elements exceeded the reference value except Ni and Pb. The spatial variation of available heavy metals was visualized by GIS. Correlation analysis was used to determine the association between soil properties and available heavy metals. The multivariate analysis suggested that the source contributions of the natural source, agricultural sources, and industrial activities accounted for 31.78%, 27.90%, and 15.48%, respectively.
近年来，中国土壤生态系统受到重金属的污染日益严重。因此，本研究调查了中国湖南省红色区域稻田土壤中有效态重金属的污染程度和空间分布，并确定了它们的来源。共采集了研究区 80 个表层土壤样品（0-20cm），采用地统计和多元分析方法分析了其空间分布和来源。结果表明，土壤中有效态 Cu、Zn、Ni、Cr、Cd、As 和 Pb 的含量分别为 1.652、1.057、0.304、0.747、0.139、0.295 和 6.348mg/kg。与土壤背景参考含量相比，除 Ni 和 Pb 外，所有测试的有效元素均超过参考值。GIS 可视化了有效态重金属的空间变化。相关分析用于确定土壤性质与有效态重金属之间的关系。多元分析表明，自然源、农业源和工业活动对重金属的来源贡献分别为 31.78%、27.90%和 15.48%。
