中文关键词土壤-农作物系统重金属形态潜在生态风险污染来源雄安新区 英文关键词soil-crop systemheavy metal formspotential ecological riskpollution sourceXiong'an New District

作者	单位	E-mail
周亚龙	中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 中国地质调查局土地质量地球化学调查评价研究中心, 廊坊 065000 中国地质科学院地球表层碳汞-地球化学循环重点实验室, 廊坊 065000	zyalong@mail.cgs.gov.cn
杨志斌	中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000	yzhibin@mail.cgs.gov.cn
王乔林	中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 中国地质调查局土地质量地球化学调查评价研究中心, 廊坊 065000 中国地质科学院地球表层碳汞-地球化学循环重点实验室, 廊坊 065000
王成文	中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 中国地质调查局土地质量地球化学调查评价研究中心, 廊坊 065000 中国地质科学院地球表层碳汞-地球化学循环重点实验室, 廊坊 065000
刘飞	中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 中国地质调查局土地质量地球化学调查评价研究中心, 廊坊 065000 中国地质科学院地球表层碳汞-地球化学循环重点实验室, 廊坊 065000
宋云涛	中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 中国地质调查局土地质量地球化学调查评价研究中心, 廊坊 065000 中国地质科学院地球表层碳汞-地球化学循环重点实验室, 廊坊 065000
郭志娟	中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 中国地质调查局土地质量地球化学调查评价研究中心, 廊坊 065000 中国地质科学院地球表层碳汞-地球化学循环重点实验室, 廊坊 065000	gzhijuan@mail.cgs.gov.cn

中文摘要 为评估雄安新区农田土壤-农作物系统重金属潜在生态风险，分析测试新区小麦籽实和根系土壤中重金属含量及其赋存形态，利用综合污染指数（IPI_N）、潜在生态风险指数（RI）、生物富集系数（BFC）和风险评价指数（RAC），采用主成分分析和相关分析等统计方法开展重金属潜在生态风险评估及来源解析.结果表明，新区根系土壤中Cd、Cu、Pb和Zn含量均值显著高于河北省表层土壤背景值.IPI_N介于0.2~5.18之间，94.83%的根系土样为安全无污染等级；土壤中Cd单指标潜在生态危害最大，其次为Hg元素，Cr、Ni和Zn潜在生态危害较小；总潜在生态风险以轻微和中等等级为主，占比分别为64.66%和30.17%.根系土壤中Cd生物活性形态组分（离子交换态和水溶态）占比达33.43%，生物有效性相对较高，其他各重金属元素赋存形态均以残渣态为主（残渣态占比>60%）.RAC指数由大到小为Cd > Ni > Hg > As > Cu > Cr > Zn > Pb，重金属Cd的RAC均值为22.75%，以中等风险为主，其他各元素RAC均为低风险或无风险.根系土壤重金属主要潜在来源是在地质背景的基础上叠加了人为活动.农作物籽实中重金属迁移、富集能力依次为Zn > Cu > Cd > Hg > As > Ni > Pb > Cr，其中As、Cd、Pb和Zn的生物有效组分对小麦籽实吸收重金属起促进作用，农作物籽实中重金属含量与土壤pH值呈负相关，土壤理化指标（OM和CEC等）双向影响土壤中重金属生物有效态组分比例. 英文摘要 In order to evaluate the potential ecological risk of heavy metals in the soil-crop system in the Xiong'an New District, the heavy metal contents and forms in wheat seed and root soil samples are analyzed, and the comprehensive pollution index (IPI_N), potential ecological risk index (RI), bio-enrichment coefficient (BFC), risk assessment code (RAC), principal component analysis, and correlation analysis are used to assess the potential ecological risk of heavy metals and analyze their sources. The results indicate that the average content of Cd, Cu, Pb, and Zn in the root soil is significantly higher than the soil background value in Hebei province. The IPI_N ranges from 0.2 to 5.18, 94.83% of the soil samples are in the safe and pollution-free grade, and the potential ecological risks of heavy metal are slight and moderate, accounting for 64.66% and 30.17%, respectively. Cd has the greatest potential ecological harm, followed by Hg, Cr, Ni, and Zn. All the heavy metal elements besides Cd in the root soil are dominated by the residual form, which accounts for 60%, and the bioactive form (ion-exchange and water-soluble state) of Cd accounts for 33.43%, indicating relatively high bio-availability. The risk assessment code can be ranked as Cd > Ni > Hg > As > Cu > Cr > Zn > Pb, and the risk of Cd is moderate, while other elements are of low or no risk. The leading potential source of heavy metals is human activity combined with the geological background. The migration and enrichment capability of the wheat seeds is in order from strong to weak of Zn > Cu > Cd > Hg > As > Ni > Pb > Cr, and the biological effective components of As, Cd, Pb, and Zn plays an substantial role in promoting the absorption of heavy metals. The content of heavy metals in the wheat seeds has a negative correlation with the soil pH, and the physical and chemical indices, such as OM and CEC, has bi-directional influence on the biological effective state of the heavy metals.

PDF全文下载地址:

https://www.hjkx.ac.cn/hjkx/ch/reader/create_pdf.aspx?file_no=20210442&flag=1&journal_id=hjkx&year_id=2021