中国农业大学学报2024，Vol.29Issue(6)：77-85,9.DOI:10.11841/j.issn.1007-4333.2024.06.09
基于稳定同位素特征与土壤性质的有机茶身份辨识研究
Identification of organic tea based on stable isotope characteristics and soil properties
摘要
Abstract
In order to explore the identity identification characteristics of organic tea in Pu'er area of Yunnan Province and improve the identity identification technology of organic tea on the plateau,5 representative organic planting certified tea gardens(ZX、LS、CYT、YS、HL)and adjacent conventional tea gardens(C-1、C-2、C-3、C-4、C-5)in Pu'er City of Yunnan Province were selected,and more than 300 tea and soil samples were collected.δ15N abundance,δ13C abundance,total nitrogen,total carbon,organic carbon,alkali hydrolyzable nitrogen and other indexes of tea and soil were determined by stable isotope mass spectrometer and element analyzer.The isotope-soil property discrimination model of organic tea was constructed by factor analysis and discriminant analysis,and verified by Holdout method.The results show that there is no consistent difference in δ15N and δ13C values between organic tea and adjacent conventional tea in different tea gardens,so it is difficult to identify organic tea by using a single stable isotope factor.Through further factor analysis of tea and soil properties,six feature vectors suitable for discrimination were selected,and a multivariate organic discrimination model based on isotope characteristics and soil properties was constructed,and the function is as follows:y=-0.081 tea δ15N+0.819 tea δ13C+0.093 soil total nitrogen+2.117 soil total carbon-0.155 soil organic carbon+2.870 soil pH+4.232,y＜0.5 is convention tea.The model achieves an impressive accuracy rate of 92.3％.In summary,the multivariate organic discrimination model constructed based on isotopic characteristic values and soil property parameter indicators can accurately discriminate the identity of organic tea from the Pu'er plateau in Yunnan.关键词
有机茶/δ15N/813C/土壤性质/判别模型Key words
organic tea/δ15N/δ13C/soil properties/discriminant model分类
农业科技引用本文复制引用
贾丽欣,双睿辰,邵金良,孟凡乔,吴迪..基于稳定同位素特征与土壤性质的有机茶身份辨识研究[J].中国农业大学学报,2024,29(6):77-85,9.基金项目
云南省重大科技专项计划项目(202202AE090029) （202202AE090029）
