中文摘要：

为了解茶叶对土壤重金属的富集规律及其对人体健康产生的危害,在皖南山区典型茶园采集嫩叶、老叶及对应土壤样品各31个,测试Mg、Al、Fe、Mn、Cr、Cu、Zn、As、Pb、Ni 10种元素含量,分析茶叶中金属元素的富集规律、影响因子及对茶客的健康风险。结果表明,老叶和嫩叶中金属元素含量差异较大,嫩叶中Mg、Zn和Ni含量明显大于老叶,老叶中Al、Fe、Mn、Cr、As、Pb含量明显大于嫩叶,尤以Al差异最显著,老叶Al含量达到嫩叶Al含量的10.2倍。种植年限对老叶金属元素含量的影响大于嫩叶,茶龄越久,促进金属元素在老叶富集。低坡位有利于茶叶中金属元素的累积。茶叶对Mn的富集能力最强,老叶对Mn的富集系数达到5.301,茶叶对Cu和Zn的富集能力较强,对Al和Fe的富集能力最低。与无公害茶叶Cu、Cr、As、Pb限值相比,嫩叶中仅Cr有少量超标。嫩叶中Ni与土壤中Ni呈显著正相关,老叶中Ni、Mg与土壤中Ni、Mg呈显著正相关,其他元素的相关性不显著,说明茶叶中大部分金属元素不仅受土壤金属总量的影响,还受土壤金属元素形态、理化性质及大气沉降等因素影响。嫩叶中Al、Mn、老叶中Cr和土壤pH呈显著负相关。土壤有机质与嫩叶和老叶中任一元素均未表现出显著的相关性。茶叶中金属元素健康风险以Cr为主,通过摄取途径所引起的Cr个人年平均风险为1.08×10-4,Cr是主要的风险污染物,Cu、Pb、Zn处于安全范围之内。

英文摘要：

In order to understand the effects of tea on enrichment patterns of soil heavy metals and their harms on human health,31 tea leaves（young and old）and corresponding soils were collected from tea garden in mountainous area of south Anhui to determine Mg,Al,Fe,Mn,Cr,Cu,Zn,As,Pb and Ni concentrations,and to analyze enrichment patterns of these metal elements,and their affecting factors and harms on human health.The results showed that there were obvious differences in metal element contents between young and old tea leaves.The concentrations of Mg,Zn and Ni in young tea leaves were obviously higher than those in old tea leaves,while concentrations of Al,Fe,Mn,Cr,As and Pb in old tea leaves were higher than those in young tea leaves,especially for Al.Al concentration in old tea leaves was 10.2times the young tea leaves.Influence of planting years on metal element contents in old tea leaves was greater than that in young leaves,with longer planting years of tea promoting the enrichment of metal elements in old tea leaves.Low altitude was conducive to the accumulation of metal elements in tea.In tea leaves,the enrichment of Mn was the strongest,with the enrichment value of Mn in old tea leaves reaching 5.301,and then followed by the enrichment of Cu and Zn,while the enrichment abilities of Al and Fe were the lowest.Compared with the limited concentrations of Cu,Cr,As,and Pb in pollution-free tea,only Cr concentration in young leaves exceeded the standard value.Ni concentration in young tea leaves and soil were positively correlated,and concentrations of Ni and Mg in old tea leaves were also positively correlated with those in soil.However,the correlations between other metal element concentrations in tea leaves and soil were not significant,indicating that most heavy metal elements in tea leaves were not only affected by total heavy metal concentrations in soil,but also affected by soil heavy metal speciation,atmospheric deposition and soil physicochemicalproperties.Soil pH value showed significant negative correlat