武夷山茶园土壤汞、镉和砷形态及茶叶有效性特征  

Fraction Distribution and Tea Bioavailability of Hg, Cd, Se in Soil from Wuyishan Tea Garden

作　　者：叶宏萌[1,2] 李国平[1] 郑茂钟[1] 袁旭音[2] 顾祺妍 

机构地区：[1]武夷学院生态与资源工程学院,福建武夷山354300 [2]河海大学环境学院,江苏南京210098

出　　处：《热带作物学报》2016年第11期2094-2099,共6页Chinese Journal of Tropical Crops

基　　金：福建省教育厅A类科技项目(No.JA14311);福建省科技创新平台建设计划项目(No.2013N2009);福建省科技厅重点项目(No.2014N0030)

摘　　要：通过测试武夷山19个茶园土壤及茶叶中的Hg、Cd和As元素全量及土壤元素化学形态组成,分析3种元素对茶叶的有效性。结果表明:土壤Hg存在一定程度的富集,以残渣态和强有机态为优势形态;Cd富集最严重,且以离子交换态为优势形态;As符合无公害茶产地环境标准(NY/T 853-2004),且以残渣态为主,占总量的70.35%。茶叶Hg、Cd、As含量属于安全范围内,均值远低于《茶叶中铬、镉、汞、砷及氟化物限量(NY659-2003)》标准限值。土壤Hg、Cd和As的生物可利用性系数及富集系数值比较得出,土壤Cd生物可利用能力最强,As次之,Hg最弱;茶叶对土壤Cd、Hg富集能力较强,对As富集较弱。总之,土壤元素种类和化学形态组成更大程度上决定了元素活性、迁移与转移能力。Total contents, chemical forms and bioavailability to tea leaf of Hg, Cd, As element in soils from 19 tea gardens of Wuyishan were studied. The results showed that, Hg had slight accumulation and was maintained by chemical forms of residual and strongly bound to organic matter; Cd was significantly enriched and advantaged by ion exchange form; The As contents of tea garden soils could meet the environmental condition criteria（NY/T853-2004） for tea production and were mostly presented in residual state which occupied 70.35% of all forms;The content of Hg, Cd, As in tea leaves was safe and each of the average values were lower than the limited values in the criteria（ NY 659-2003）. The comparative result of the bioavailability coefficient values of Hg, Cd,As in soils was that Cd was the greatest, followed by As, and Hg was the least. The enrichment ability of Hg,Cd, As in leaves was that Hg and Cd were strong, and As was weak. In a word, the kind and chemical form composition of element in soil mainly determine the element activity, migration and transfer capability.

关 键 词：茶园土壤 汞 镉 砷 茶叶 生物有效性 武夷山 

分 类 号：S571.1[农业科学—茶叶生产加工]