N-cycling functional genes and soil properties shape the heterogeneity of nitrous oxide emission pathways in tea plantation soils

文献类型： 外文期刊

第一作者： Tu, Longping

作者： Tu, Longping;Xu, Zhe;Yin, Huacheng;Dong, Yubing;Ma, Ruoya;Huang, Yawen;Wu, Shuang;Li, Shuqing;Liu, Shuwei;Wang, Jinyang;Han, Zhaoqiang;Zou, Jianwen;Tu, Longping;Xu, Zhe;Yin, Huacheng;Ma, Ruoya;Huang, Yawen;Wu, Shuang;Li, Shuqing;Liu, Shuwei;Wang, Jinyang;Han, Zhaoqiang;Zou, Jianwen;Tu, Longping;Xu, Zhe;Yin, Huacheng;Ma, Ruoya;Huang, Yawen;Wu, Shuang;Li, Shuqing;Liu, Shuwei;Wang, Jinyang;Han, Zhaoqiang;Zou, Jianwen;Dong, Yubing

作者机构：

关键词： Acid soil; Greenhouse gas; Nitrification; Denitrification; N-15 isotope

期刊名称：ENVIRONMENTAL TECHNOLOGY & INNOVATION （ 影响因子：7.1； 五年影响因子：7.1 ）

ISSN： 2352-1864

年卷期： 2025 年 39 卷

页码：

收录情况： SCI

摘要： Tea (Camellia sinensis), one of the world's most popular beverages, plays a vital role in socioeconomic development. However, nitrous oxide (N2O) emissions from tea plantation soils have become a serious environmental issue, largely due to soil acidification and excessive N fertilizer inputs. Despite this, there is still a knowledge gap in determining how much nitrification and denitrification contribute to overall N2O emissions in tea plantation soils, which makes it difficult to make focused mitigation strategies. Here, we utilized 15N isotope labeling experiments to probe into the contribution of various microbial pathways to N2O emissions of tea plantation soils across seven major tea-producing provinces in China. We assessed soil properties, microbial diversity and composition, N2O production-and-reduction-related functional gene abundances, and keystone species abundances to probe into driving mechanisms influencing N2O sources. The results revealed significant heterogeneity of N2O emission intensity and pathways among different tea plantation soils. Co-denitrification and heterotrophic nitrification emerged as the primary contributors of N2O emissions, accounting for an average of 34 % and 41 %, respectively. However, the mean contributions of denitrification and autotrophic nitrification were only 22 % and 3 %, respectively. Variance partitioning and correlation analyses indicated that this heterogeneity was predominantly driven by N-cycling gene abundances and soil properties (both contributed 71 % of the explanation) rather than microbial diversity and keystone species abundance. This study advances our understanding of the soil N-cycling process in acidic soils and provides a groundwork for formulating targeted measures to reduce N2O emissions based on the dominant pathways in tea plantation soils.

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