摘要
【目的】研究新平县茶园核心区土壤重金属含量特征及来源,评价茶园土壤重金属生态风险与预警状况。【方法】共采集30个新平县茶园核心区土壤混合样品,采用污染负荷指数(pollution load index,PLI)、潜在生态风险指数(potential ecological risk index,RI)和生态风险预警指数(ecological risk warning index,IER)对土壤重金属污染及生态风险进行评价。【结果】新平县茶园核心区土壤中Cd、Pb、Hg、As、Cr、Cu、Zn的平均含量分别为0.11、58.14、0.142、12.24、83.01、32.61、67.97 mg/kg,均未超出国家土壤环境质量Ⅱ级标准,仅Hg、Cr和Pb平均值超过云南省土壤背景值,分别是对应背景值的2.60、1.15和1.11倍。各重金属元素单因子污染指数(contamination factor,Cfi)从大到小依次为:Hg>Cr>Pb>As>Cd>Zn>Cu,其中,Hg为中度污染,Cr和Pb轻度污染,As、Cd、Zn和Cu属无污染;PLI平均值为0.81,为无污染。潜在生态风险评价结果显示:单个重金属潜在生态风险(Eri)顺序为:Hg>Cd>Pb>Cr>Zn>Cu>As,茶园核心区土壤RI平均值为28.07,存在轻微生态风险。8个乡镇茶园土壤RI依次为:建兴乡(35.7)>平掌乡(35.2)>漠沙镇(31.3)>者竜乡(25.2)>戛洒镇(25.1)>水塘镇(22.13)>平甸乡(22.07)>新化乡(19.4)。土壤IER平均值为-4.36,属于无警级别。Hg是生态风险等级最高的重金属元素,对研究区土壤PLI、RI和IER的贡献非常大。【结论】新平县茶园核心区土壤整体上存在轻微生态风险,属于无预警态势,可在维持原生态环境的同时发展高品质农业。
[Purposes]To study the characteristics and sources of heavy metals,and to evaluate their ecological risk and early warning of tea plantations soil in Xinping County.[Methods]We collected30samples of soil mixture to evaluate the heavy metal pollution and ecological risk of tea plantations soil in Xinping County by the pollution load index(PLI),potential ecological risk index(RI)and the ecology risk warning index(IER).[Results]The average values of Cd,Pb,Hg,As,Cr,Cu and Zn in the soils were 0.11,58.14,0.142,12.24,83.01,32.61 and 67.97mg/kg,respectively;Hg,Cr and Pb concentrations were as2.60,1.15and1.11times as the background values of soil in Yunnan Province,were mainly affected by human activities.But their concentrations were all lower than the threshold values II of the National Environmental Quality Standard for Soil(GB15618-1995).Each single contamination factor(Cf^i)revealed that the level of heavy metal pollution in the soils was in order of Hg>Cr>Pb>As>Cd>Zn>Cu,Hg pollution was of moderate level while Cr and Pb pollution were slight.The average PLI was0.81,there was no soil pollution caused by heavy metals.The sequence of potential ecological risk of heavy metal was Hg>Cd>Pb>Cr>Zn>Cu>As.The integrated factor RI of heavy metal pollution in the soils was28.07,suggesting a low ecological risk.The RI of tea plantation soils in8villages or towns was in order of Jianxing Village(35.7)>Pingzhang Village(35.2)>Mosha Town(31.3)>Zhelong Village(25.2)>Gasa Town(25.1)>Shuitang Town(22.13)>Pingdian Village(22.07)>Xinhua Village(19.4).The average value of the soil IER was-4.36,which belonged to the no warning.Hg was the heavy metal element with the highest ecological risk level,the contribution of soil PLI,RI and IER in the research area was very large.[Conclusions]The potential ecological risk analysis suggested a slight risk to local ecosystem originated from heavy metal contamination in the soils of tea plantation in Xinping,which belonged to the no-warning situation,and could develop high quality agriculture while maintaining the original ecological environment.
作者
鲁冬梅
李雪
李继芬
温继良
李淑英
朱春蓉
周元清
张翠萍
LU Dongmei;LI Xue;LI Jifen;WEN Jiliang;LI Shuying;ZHU Chunrong;ZHOU Yuanqing;ZHANG Cuiping(Environmental Monitoring Station in Hongta County,Yuxi 653100,China;Xinping Yi-Dai Autonomous County Economic Crops Work Station,Xinping 653400,China;State-owned Assets Management Bureau,Yuxi Normal University,Yuxi 653100,China;Research Center for Pollution Control and Ecological Restoration,Yuxi Normal University,Yuxi 653100,China)
出处
《云南农业大学学报（自然科学版）》
CSCD
北大核心
2018年第6期1154-1162,共9页
Journal of Yunnan Agricultural University:Natural Science
基金
国家自然科学基金项目(31460144
31670472)
国家艺术基金青年项目(15CD137)
关键词
茶园核心区
土壤重金属
生态风险评价
tea plantations
soil heavy metals
ecological risk assessment
