梧州六堡茶园土壤重金属特征及安全性评价  

Characteristics and Safety Evaluation of Heavy Metals in Wuzhou Liubao Tea Garden Soils

作　　者：刘茜[1] 程道品[2] 张立杰 LIU Qian;CHENG Dao-pin;ZHANG Li-jie(School of Chemical Engineering and Resource Recovery,Wuzhou University,Wuzhou 543000,China;Scientific Research Department, Wuzhou University,Wuzhou 543000,China;School of Tourism Leisure and Management,Guilin Tourism University,Guilin 541000,China)

机构地区：[1]梧州学院化学工程与资源再利用学院,中国梧州543000 [2]桂林旅游学院旅游休闲与管理学院,中国桂林541000 [3]梧州学院科研处,中国梧州543000

出　　处：《湖南师范大学自然科学学报》2018年第5期56-62,共7页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金资助项目(41461005);广西地质矿产勘查开发局地球化学研究项目(20141219)

摘　　要：为了对茶园土壤进行安全性评价,收集梧州六堡茶园区土壤,测定园区土壤重金属含量,并运用内梅罗综合污染指数和潜在生态风险指数进行土壤重金属污染评价.研究结果表明:茶园土壤中不同的重金属含量差异显著,重金属Cr,Cu,Zn,As,Cd和Hg的平均含量均低于广西土壤背景值,但Pb元素高于广西背景值1.46倍.进一步对比发现,26个六堡茶园土壤的重金属平均含量均低于茶叶产地环境技术条件(NY/T 853—2004)和有机茶产地环境条件(NY/T 5199—2002)的基本要求,无一超标.对照NY/T 853—2004标准,供试土壤综合污染指数评价结果中,有25个茶园土壤指数值在安全等级,仅1个茶园土壤为警戒级别;综合潜在生态风险评价结果显示,26个茶园风险等级全部为低级水平,属轻微生态污染.总体结果表明,梧州市六堡茶园土壤环境质量总体良好,未受到重金属污染.In order to evaluate the safety of tea garden soil,in this study,we analyzed the content of heavy metals in Wuzhou Liubao Tea Garden,and accessed heavy metal pollution of soil by Nemerow multi-factor pollution index and potential ecological risk index,based on the on-site samples collected and tested.Our results indicate that there were significant differences in the content between different types of heavy metals in the tea garden soil.The average content of heavy metals,such as Cr,Cu,Zn,As,Cd and Hg,were lower than those of the Guangxi soil background value,while the content of Pb was 1.46 times higher than that of the Guangxi soil background value.The average content of all heavy metals in the tea garden soil was under the standard of the environmental requirement for the area to grow teas(NY/T 853-2004)and the environmental condition for organic tea production(NY/T 5199-2002).According to the standard of NY/T 853-2004,the Nemerow multi-factor pollution index values of twenty-five tea gardens were at the safe level,only one tea garden was at the alert level.Our potential ecological risk index assessment showed that the risk level of the twenty-six gardens was“low”and they had slight ecological harm to the garden.In summary,the Liubao garden soil environmental quality was generally good and it has not been found to be contaminated by heavy metals.

关 键 词：重金属 土壤 内梅罗综合污染指数 潜在生态风险 

分 类 号：S571.1[农业科学—茶叶生产加工]