武义有机茶品质和稳定同位素特征及识别  

Quality and stable isotope characteristics and identification of Wuyi organic tea

作　　者：徐欢 郭祖闯 刘瑞敏 邵圣枝[2] 袁玉伟[2] 李春霖 XU Huan;GUO Zuchuang;LIU Ruimin;SHAO Shengzhi;YUAN Yuwei;LI Chunin(Zhejiang Gengxiang Organic Tea Industry Development Co.,Ltd.,Wuyi 321000,Zhejiang;Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,Zhejiang)

机构地区：[1]浙江更香有机茶业开发有限公司,浙江武义321000 [2]浙江省农业科学院,浙江杭州310021

出　　处：《浙江农业科学》2024年第7期1687-1694,共8页Journal of Zhejiang Agricultural Sciences

基　　金：武义县与浙江省农业科学院科技合作项目。

摘　　要：武义县是我国首个“有机茶之乡”,为挖掘武义有机茶的关键特征指标,本研究分别在早春和晚春时期采集了武义县不同肥料和不同有机栽培年份的茶叶样品,采用化学分析、感官审评和元素分析-稳定同位素比率质谱等技术,对茶叶中的主要化学成分、感官品质以及碳、氮元素和同位素含量(δ^(13)C、δ^(15)N)进行检测。结果表明,相较于使用化肥的茶叶,使用有机肥茶叶中游离氨基酸含量更高、香气和滋味更优、δ^(15)N含量更高。大部分化学成分和稳定同位素比值均在有机栽培5~10 a的茶叶样品中更高。利用化学成分和碳氮元素组成建立偏最小二乘法判别模型,能够很好地区分有机栽培和常规栽培茶叶。结合变量重要性投影分析,表明δ^(15)N和茶多酚含量是判别有机茶的关键特征指标。该研究为促进有机茶产业健康发展及市场监管提供了技术支撑和科学依据。Wuyi County is the first“Hometown of Organic Tea”in China.In order to explore the key characteristic indicators of Wuyi organic tea,this study collected tea samples from different fertilizers and organic cultivation years in Wuyi County in early and late spring.Chemical analysis,sensory evaluation,and elemental analysis stable isotope ratio mass spectrometry were used to analyze the main chemical components,sensory quality,the content of carbon,nitrogen elements,and isotope(δ^(13)C、δ^(15)N)content of tea.The results showed that compared with the tea treated with chemical fertilizers,tea treated with organic fertilizers had a higher content of free amino acids,better aroma and taste.The content ofδ^(15)N was higher.Most of the chemical composition and stable isotope ratios were higher in tea samples grown organically for 5-10 years.Establishing a partial least squares discriminant model using chemical composition and carbon and nitrogen element composition can effectively distinguish between organic and conventional tea cultivation.Combining variable importance for projection analysis,it indicated that the content ofδ^(15)N and tea polyphenol were key characteristic indicators for distinguishing organic tea.This article provides technical support and scientific basis for promoting the healthy development of the organic tea industry and market regulation.

关 键 词：有机茶 品质成分 稳定同位素 偏最小二乘法 

分 类 号：S571.1[农业科学—茶叶生产加工]