[Source Apportionment of Soil Heavy Metals in Moqi Area on the Northwest Edge of Songnen Plain Based on the PCA-PMF Model].

Q2 Environmental Science
Yong Yang, Hang Liu, Kai-Ming Zhao, Xue-Wen Wang, Ming-Jun Li, Ru-Xin Wang, Rui-Hong Li
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引用次数: 0

Abstract

Black soil resources are widely distributed in Morin Dawa Daur Autonomous Banner (Moqi), northwest margin of the Songnen Plain, which is an advanced county of grain production in China and an important agricultural producing area in the east of Hulunbuir City, Inner Mongolia. Carrying out research on distribution characteristics and source apportionment of heavy metals in soil is important for preventing and controlling ecological environmental risks and protecting black soil in the northwest margin of the Songnen Plain. A total of 161 surface soil sites were systematically collected from black soil in the Moqi area, and the contents and spatial distribution characteristics of eight heavy metals (Cu, Pb, Ni, Cd, Cr, Zn, As, and Hg) were analyzed. The characteristics of soil heavy metal pollution and its ecological risk were evaluated using the single factor pollution index and potential ecological risk index, and the sources and contribution rates were quantitatively analyzed using multivariate statistical analysis and positive definite matrix factorization (PMF) model. The results showed that: ① The overall heavy metal pollution level in the soil of the research area was light, with Pb(PI=1.38), Zn(PI=1.32), and Cr(PI=1.32) being the main heavy metal pollution elements. ② The degree of variation of Cd and Hg was strong (CV≥0.36), Cd showed moderate ecological risk at 17.39% of the sampling sites, Hg showed moderate and high ecological risk at 36.65% and 3.11% of the sampling sites, and the potential ecological risk of the other heavy metals was slight. ③ The spatial distribution of Cu, Ni, and Cr was similar, and there was a highly significant positive correlation among them, mainly derived from agricultural activities; Pb was significantly positively correlated with As, mainly influenced by transportation and agricultural activities; Cd and Zn had similar spatial distribution and were highly influenced by agricultural activities; and Hg mainly came from soil parent material. This research can provide scientific basis for the protection of black soil and the prevention and control of agricultural heavy metal pollution risks in the Moqi area on the northwest edge of the Songnen Plain.

基于PCA-PMF模型的松嫩平原西北缘莫起地区土壤重金属来源解析[j]。
松嫩平原西北缘莫林达瓦达斡尔自治旗境内黑土资源分布广泛,是中国粮食生产先进县,也是内蒙古呼伦贝尔市东部重要的农业产区。开展土壤重金属分布特征及来源解析研究,对松嫩平原西北缘生态环境风险防控和黑土保护具有重要意义。系统采集了漠齐黑土161个表层土壤样点,分析了8种重金属(Cu、Pb、Ni、Cd、Cr、Zn、As、Hg)的含量及空间分布特征。采用单因素污染指数和潜在生态风险指数评价土壤重金属污染特征及其生态风险,采用多元统计分析和正定矩阵分解(PMF)模型定量分析土壤重金属污染来源和贡献率。结果表明:①研究区土壤重金属污染总体较轻,主要重金属污染元素为Pb(PI=1.38)、Zn(PI=1.32)和Cr(PI=1.32)。②Cd和Hg变异程度较强(CV≥0.36),17.39%的采样点Cd表现为中度生态风险,36.65%和3.11%的采样点Hg表现为中度和高度生态风险,其他重金属的潜在生态风险较轻。③Cu、Ni、Cr的空间分布相似,呈极显著正相关,主要来源于农业活动;Pb与As呈显著正相关,主要受交通运输和农业活动的影响;Cd、Zn空间分布相似,主要受农业活动的影响;Hg主要来源于土壤母质。该研究可为松嫩平原西北缘漠齐地区黑土保护和农业重金属污染风险防控提供科学依据。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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