摘要
为探究茶树不同叶位的传统稳定同位素分布及其随时间的变化特征,本研究以龙井43#品种茶树为研究对象,采用元素分析-同位素比值质谱仪(EA-IRMS)对不同叶位叶片的碳同位素(δ(13)^C)、氮同位素(δ(15)^N)、氢同位素(δ(2)^H)和氧同位素(δ(18)^O)进行分析。结果表明,随叶位自上向下递增,叶片中δ(13)^C、δ(15)^N和δ(2)^H显著贫化,而δ(18)^O呈现相对较弱的贫化,且第2~第5叶位叶片的同位素比值最高(21.0‰~25.0‰),相邻叶位的同位素分馏系数差异不大。此外,随着采样时间的变化和环境气候影响,前三叶位叶片的δ(13)^C和δ(15)^N总体呈现富集特征,而δ(2)^H和δ(18)^O出现先贫化后富集的变化特征。本研究结果为探究茶树不同叶位茶叶传统稳定同位素的分布提供了数据支撑,也为研究茶叶分馏机制和数据库构建奠定了基础。
To study the distribution of traditional stable isotopes in different leaf positions of Camellia sinensis and their changing characteristics with time,theδ(13)^C,δ(15)^N,δ(2)^H andδO of leaves at different leaf positions in Longjing 43#were analyzed by elemental analysis-isotope ratio mass spectrometer(EA-IRMS).The results showed thatδ(13)^C,δ(15)^N,andδ(2)^H of leaves were significantly depleted from top to bottom of leaf position.ButδO was not significant depleted compared with other three isotopes,which showed the highest(21.0‰~25.0‰)from second to fifth leaf position.There was no significant difference in isotopic fractionation coefficients between adjacent leaf positions.Affected by the sampling time and environmental climate,δ(13)^C,δ(15)^N of the former 3 position leaves became enriched during our research date,whileδ(2)^H andδO were depleted and then enriched.This study would provide data support for exploring distribution of traditional stable isotopes in leaves at different positions and establish a foundation for studying of fractionation mechanism and database construction.
作者
夏魏
聂晶
李鑫
李春霖
邵圣枝
李祖光
袁玉伟
XIA Wei;NIE Jing;LI Xin;LI Chunlin;SHAO Shengzhi;LI Zuguang;YUAN Yuwei(Institute of Quality,Safety and Nutrition of Agricultural Products,Zhejiang Academy of Agricultural Sciences,Hangzhou,Zhejiang 310021;College of Chemistry and Engineering,Zhejiang University of Technology,Hangzhou,Zhejiang 310014;Tea Research Institute,Chinese Academy of Agricultural Sciences,Hangzhou,Zhejiang 310008;Key Laboratory of Agricultural Product Information Traceability,Ministry of Agriculture and Rural Affairs,Hangzhou,Zhejiang 310021)
出处
《核农学报》
CAS
CSCD
北大核心
2022年第11期2183-2189,共7页
Journal of Nuclear Agricultural Sciences
基金
农产品溯源学科建设专项基金资助(2019-ZAAS)
质量安全危害因子与风险国家重点实验室农产品防控(2010DS700124-ZZ2004)
浙江省重点研发项目(2020C02023)
浙江省自然科学基金青年项目(LQ19C130003)。
关键词
茶树
稳定同位素
叶位
分馏系数
Camellia sinensis
stable isotope
leaf position
fractionation coefficient
