Decades-long organic tea production is distinguished by N deficiency: Evidence from soil and tea δ15N data

文献类型： 外文期刊

第一作者： Shuang, Ruichen

作者： Shuang, Ruichen;Wu, Di;Du, Lijuan;Shao, Jinliang;Tian, Yuping;Meng, Fanqiao

作者机构：

关键词： Stable isotope; N deficiency; Organic tea; Authentication

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2024 年 929 卷

页码：

收录情况： SCI

摘要： To investigate the possibility of identifying commercial organic teas from conventional teas based on their isotopic signatures, we sampled tea leaves and soil samples from three tea gardens in Pu'er, China, that underwent decades of certified organic cultivation and compared them with adjacent conventional gardens. We found that long-term organic tea cultivation increased the soil organic carbon and soil pH but significantly decreased the total N content of tea. Higher 815N values were observed in the organic teas, but significant overlap existed with non -organic teas. The lower N content of the organic tea and contrasting pattern between the organic tea 815N and soil 815N suggested that the decline of the N availability could potentially act as a robust characteristic for discriminating between organic and non -organic tea cultivation systems. Further analysis implies that combining tea and soil N content with 815N value is a promising approach to organic tea identification.

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