锗、铜、铅和锌在云南大叶种茶树不同组织中的含量分布  

Concentration Distribution Characteristics of Germanium, Copper, Lead and Zinc in Different Tissues of Yunnan Large-leaved Tea Plant

作　　者：杨婉秋 肖涵 缪德仁 YANG Wanqiu;XIAO Han;MIAO Deren(School of Chemistry and Chemical Engineering,Kunming University,Kunming,Yunnan,China 650214)

机构地区：[1]昆明学院化学化工学院,云南昆明650214

出　　处：《昆明学院学报》2020年第6期30-34,共5页Journal of Kunming University

基　　金：国家自然科学基金资助项目(31960057);云南省高校食品安全检测技术重点实验室建设项目。

摘　　要：查明土壤中锗的形态分布和大叶种茶树各组织中锗含量的分布特征有助于揭示土壤锗的植物有效性和锗在"土壤-茶树"系统中的迁移-转运机制.结果表明,茶园土壤中锗的植物有效性极低,赋存形态主要以残渣态为主(占89.61%),可交换态含量仅占0.13%.土壤中具有植物潜在可利用性的锗占比为3.23%,且有机结合态锗占比达2.60%,说明土壤中具有植物潜在可利用性的锗主要与土壤有机质相结合.茶树不同组织中锗的含量分析结果显示,茶树各组织中锗含量由高到低的顺序为:w(老叶)>w(嫩叶)>w(根)>w(茎)>w(皮)>w(花)=w(果),分布特征表现为上部组织含量高于下部.迁移系数计算结果表明,锗在茶树嫩叶中的迁移系数为0.025 9,说明在富锗土壤中种植茶树可有效获取天然富锗茶产品.Finding out the distribution characteristics of germanium(Ge) in soils and the concentration distributions in different tissues of Yunnan large-leaved tea plant will help to reveal the plant availability of Ge in soil and the mechanism of migration and transportation in the soil-tea plant system. The results showed that, the plant availability of Ge in tea garden soil was very low. The main occurrence form of Ge was residue fraction(89.61%), but the exchangeable fraction was only 0.13%. The proportion of Ge with potential plant availability was 3.23%;however, the fraction of Ge bounded with organic matter was 2.60%, which indicated that Ge with potential plant availability in soil was mainly combined with soil organic matter. The concentration of Ge in different tissues showed that the concentration descending order of Ge was old leaf>tender leaf>root>stem>bark>flower=fruit. The concentration distribution characteristics showed that the concentration of Ge in upper tissue was higher than that in under part. The results of the transfer coefficient of Ge in tender tea leaves was 0.025 9, which indicated that tea plants planted in rich Ge soils could obtain natural rich Ge tea products effectively.

关 键 词：锗 大叶种茶树 转移系数 植物有效性 

分 类 号：TS272[农业科学—茶叶生产加工]