| 宁夏引黄灌区农田土壤重金属生态风险评价及来源解析 |
| 摘要点击 1868 全文点击 538 投稿时间：2022-04-11 修订日期：2022-05-06 |
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| 中文关键词 宁夏引黄灌区|农田|重金属|生态风险评价|源分析 |
| 英文关键词 Yellow River irrigation area of Ningxia|farmland|heavy metal|risk assessment|source apportionment |
| 作者 | 单位 | E-mail | | 陈林 | 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地, 银川 750021
宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 银川 750021
宁夏大学生态环境学院, 银川 750021 | chenlin198388@163.com | | 马琨 | 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地, 银川 750021
宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 银川 750021
宁夏大学生态环境学院, 银川 750021 | makun0411@163.com | | 马建军 | 宁夏农业环境保护监测站, 银川 750002 | | | 王金保 | 宁夏农业环境保护监测站, 银川 750002 | | | 李虹 | 宁夏农业环境保护监测站, 银川 750002 | | | 贾彪 | 宁夏大学农学院, 银川 750021 | | | 倪细炉 | 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地, 银川 750021
宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 银川 750021
宁夏大学生态环境学院, 银川 750021 | | | 马进鹏 | 宁夏大学西北土地退化与生态恢复国家重点实验室培育基地, 银川 750021
宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 银川 750021
宁夏大学生态环境学院, 银川 750021 | | | 梁翔宇 | 宁夏农业环境保护监测站, 银川 750002 | |
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| 中文摘要 |
| 农田土壤环境直接关系到农产品质量安全,为了解宁夏引黄灌区农田土壤重金属特征及主要影响因子,在2017~2021年连续5年采样分析了重金属分布特征和相关关系,评价了重金属污染状况和潜在生态风险,解析了农田重金属主要来源.结果表明,宁夏引黄灌区土壤ω(Pb)、ω(As)、ω(Zn)、ω(Ni)、ω(Cu)、ω(Hg)、ω(Cr)和ω(Cd)的平均值分别为19.74、11.67、66.88、29.09、22.55、0.03、62.27和0.19 mg·kg-1,相对宁夏土壤环境背景值存在一定程度的富集,无中度及以上污染等级.其中,Hg和Cd有中、较高等级生态风险点位,但均未超过农用地土壤污染风险管控值,所有样点均无高风险和极高风险等级.正定矩阵因子分解模型(PMF)与相关分析结合得出的源解析结果表明,研究区农田土壤重金属来源有自然来源、工矿活动及居民生产生活的混合源、交通运输源、农业生产活动源和工业源等5个主要来源,贡献率分别为26.54%、25.59%、22.52%、15.63%和9.72%.综合来看,宁夏引黄灌区农田土壤重金属均无超标现象,且没有较高等级生态风险,农田土壤生产环境条件良好,但人为活动对土壤重金属的贡献率较大. |
| 英文摘要 |
| The farmland environment is directly related to the quality and safety of agricultural products. In order to understand the characteristics and main influencing factors of heavy metals in farmland soil in the Yellow River irrigation area of Ningxia, sampling and monitoring were conducted for five consecutive years from 2017 to 2021, and the distribution characteristics and correlation of heavy metals were analyzed. The pollution status and potential ecological risks of heavy metals were evaluated, and the main sources of heavy metals in farmland were analyzed. The results showed that the average values of Pb, As, Zn, Ni, Cu, Hg, Cr, and Cd in the soil of the Ningxia Yellow River irrigation area were 19.74, 11.67, 66.88, 29.09, 22.55, 0.03, 62.27, and 0.19 mg·kg-1, respectively, which were enriched to some extent compared with the background values of the soil environment in Ningxia. Among them, Hg and Cd had middle- and high-grade ecological risk points; however, none of them exceeded the control value of agricultural land soil pollution risk, and all sampling sites had no high-risk or extremely high-risk levels. The results of source analysis based on positive matrix factorization (PMF) and correlation analysis showed that there were five main sources of heavy metals in farmland soil in the study area: natural sources, mixed sources of industrial and mining activities and the production and life of residents, transportation sources, agricultural production activities sources, and industrial sources, with contribution rates of 26.54%, 25.59%, 22.52%, 15.63%, and 9.72%, respectively. On the whole, the heavy metals in farmland soil in the Ningxia Yellow River irrigation area did not exceed the standard, and there was no high-level ecological risk. The production environment of the farmland soil was good, but the contribution rate of human activities to soil heavy metals was large. |
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