西藏茶叶稳定同位素特征与区域差异及环境因子关系分析  

Characteristics of Stable Isotopes in Tibet Tea Differentiating With Other Regions and Relationship With Environment Variables

作　　者：李梁 李春霖 王贞红 刘振东 聂晶 张永志[2] 袁玉伟[2] LI Liang;LI Chunlin;WANG Zhenhong;LIU Zhendong;NIE Jing;ZHANG Yongzhi;YUAN Yuwei(Food Science College,Tibet Agriculture&Animal Husbandry University/The Provincial and Ministerial co-founded Collaborative Innovation Center for R&D in Tibet Characteristic Agricultural and Animal Husbandry Resources,Linzhi,Tibet 860000;Institute of Agro-product Safety and Nutrition,Zhejiang Academy of Agricultural Sciences/Key Laboratory of Information Traceability for Agricultural Products,Ministry of Agriculture and Rural Affairs,P.R.China,Hangzhou,Zhejiang 310021;Resources&Environment College,Tibet Agriculture&Animal Husbandry University,Linzhi,Tibet 860000)

机构地区：[1]西藏农牧学院食品科学学院/西藏特色农牧资源研发省部共建协同创新中心,西藏林芝860000 [2]浙江省农业科学院农产品质量安全与营养研究所/农业农村部农产品信息溯源重点实验室,浙江杭州310021 [3]西藏农牧学院资源与环境学院,西藏林芝860000

出　　处：《核农学报》2022年第9期1797-1804,共8页Journal of Nuclear Agricultural Sciences

基　　金：2020年西藏自治区科技重点研发项目(XZ202001ZY0035N);浙江省农业科学院财政专项(2020);2022中央支持地方高校改革发展专项资金项目(KY2022ZY-03)。

摘　　要：西藏茶叶具有高原茶品质特征,是助推西藏经济发展的重要高价值农产品。为探明西藏茶叶同位素特征,探索气象环境对茶叶同位素的影响,本研究收集了西藏不同海拔地区茶叶以及全国主产区茶叶样品,分析茶叶中稳定同位素值(δ^(13)C、δ^(15)N、δ^(2)H、δ^(18)O),同时收集部分采样点的环境气象信息,结合偏最小二乘法(PLS)探究西藏茶叶同位素特征及环境因子关联性。结果表明,西藏茶叶δ^(13)C值分布于-31.9‰~-27.8‰之间,随海拔升高而降低,显著低于其他主产区样品(P<0.01),δ^(13)C值主要与采样当月的日照时间和气温有关;西藏茶叶δ^(15)N与其他主产区样品无显著差异,且与环境气象因子关联性较弱;δ^(2)H值介于-111.5‰~-40.5‰之间,与环境气象因子关联性最强,受相对湿度等多种因素影响;δ^(18)O值介于22.2‰~27.6‰之间,主要与气温关系密切。本研究结果为西藏茶叶产地特征挖掘提供了研究思路,为西藏茶叶品牌保护提供了一定的理论依据。Tibet tea has distinguished plateau quality characteristics,which is one of the high value agricultural products of Tibet.To explore the characteristics of stable isotopes in Tibet tea and its relationship with the climate environment,this study collected tea samples from Tibet with different altitudes and from main producing area in China.Stable isotope ratios(δ^(13)C、δ^(15)N、δ^(2)H、δ^(18)O)of tea samples were analyzed,while environment climate information were collected from each sampling site.The relationship between tea isotope characteristics and environment climate variables were built using partial least squares(PLS).The results showed thatδ^(13)C values in Tibet tea were-31.9‰~-27.8‰,decreasing with elevation.Theδ^(13)C in Tibet tea were significant lower than samples from other main producing area(P<0.01),associating with sunshine duration and temperature in the sampling month.There were no significant differences ofδ^(15)N values between Tibet tea and samples from other main producing area,and the correlation betweenδ^(15)N and climate variables was weak.The range ofδ^(2)H was-111.5‰~-40.5‰,and the correlation with climate variables was most strong among the isotopes investigated.Theδ^(2)H values was effect by various factors such as relative humidity.Theδ^(18)O values were 22.2‰~27.6‰,relating closely with temperature.The present study could provide new research idea for the exploring of origin characteristics in Tibet tea,which also could supply theoretical basis for the brand protection of Tibet tea.

关 键 词：西藏茶叶 稳定同位素 环境因子 偏最小二乘 变量重要性 

分 类 号：TS272[农业科学—茶叶生产加工]