摘要
茶园土壤重金属风险的特定源识别是当前生态茶园建设的重要内容.文中以闽北白茶主产区(政和县和松溪县)茶园为对象,分析土壤重金属(Cd、Hg、As、Cr、Pb)含量的空间分布和污染状况,量化特定源的潜在生态与人体健康风险,并识别优先控制污染源和污染物.结果表明,该茶区土壤5种重金属含量均值依次为0.10、0.07、5.43、46.37、52.01 mg·kg^(−1),都未超过《土壤环境质量农用地土壤污染风险管控标准》(GB15618—2018)的风险筛选值.地质积累指数以无污染为主,且各元素的均值大小顺序为:Cd>Cr>Pb>As>Hg.其中,Cd和Pb以农业源为主,As、Cr、Hg以自然源为主.综合潜在生态风险的来源中,农业源>自然源>其他源,并以Cd与Hg的生态风险最高.人体健康风险来源以自然源为主,并且尚无非致癌风险和人体不可耐受的致癌风险.今后,应优先控制该茶区土壤农业源的Cd污染及生态风险,并兼顾Pb的污染防控,以促进生态茶园建设和茶产业健康发展.
Identifying specific sources of heavy metal risks in tea garden soils is crucial for constructing ecological tea gardens.This study investigates tea gardens in Northern Fujian's primary white tea production regions(Zhenghe County and Songxi County),analyzing the spatial distribution and pollution levels of soil heavy metals(Cd,Hg,As,Cr,Pb).By quantifying potential ecological and human health risks from distinct sources,the study identifies priority pollution sources and key pollutants.Results show that the mean concentrations of the five heavy metals in the tea garden soils are 0.10(Cd),0.07(Hg),5.43(As),46.37(Cr),and 52.01(Pb)mg·kg^(−1),respectively.They are all below the risk control thresholds specified in China's Soil Environmental Quality-Risk Control Standard for Agricultural Land"(GB15618-2018).The geoaccumulation index analysis indicates that the soils are largely uncontaminated,with average pollution levels ranked as Cd>Cr>Pb>As>Hg.Source apportionment reveals that Cd and Pb primarily derive from agricultural activities,whereas As,Cr,and Hg are predominantly of natural origin.Comprehensive ecological risks assessment highlights agricultural sources are the most significant contributor,followed by natural and other sources,with Cd and Hg posing the highest ecological risks.Human health risks are mainly linked to natural sources,though current levels present no non-carcinogenic risks or intolerable carcinogenic threats.To ensure sustainable tea industry development and support ecological tea garden construction,priority should be given to mitigating Cd pollution and its associated agricultural-source ecological risks in this region.Concurrently,measures to control Pb pollution should be implemented.These strategies are vital for safeguarding soil health and fostering long-term industry sustainability.
作者
聂榕
叶宏萌
梁玉婷
洪永聪
张见明
韩子成
王琪楚曦
石奥文
NIE Rong;YE Hongmeng;LIANG Yuting;HONG Yongcong;ZHANG Jianming;HAN Zicheng;WANG Qichuxi;SHI Aowen(College of Ecology and Resource Engineering,Wuyi University,Fujian Provincial Key Laboratory of Green Technology for Ecological Industry,Wuyishan,354300,China;Wuyi University,Wuyishan,354300,China)
出处
《环境化学》
北大核心
2025年第7期2459-2471,共13页
Environmental Chemistry
基金
福建省对外合作科技计划项目(2024I0030)
福建省自然科学基金(2022J05263)
南平市自然科学基金联合资助项目(N2023J005)
南平市科技特派员资源产业科技创新联合资助项目(N2023Z007)
南平市科技特派员创新创业大赛项目(N2022T002)
大学生创新训练计划项目(S202410397051)资助.
关键词
重金属
潜在生态风险
人体健康风险
源解析
茶园
heavy metals
potential ecological risks
human health risks
source apportionment
tea garden
