文献类型：期刊文献

英文题名：Soil Enzyme Activities and Microbial Carbon Pump Promote Carbon Storage by Influencing Bacterial Communities Under Nitrogen-Rich Conditions in Tea Plantation

作者：Shu, Qi[1] Gao, Shenghua[1] Liu, Xinmiao[1] Yao, Zengwang[2] Wu, Hailong[1] Qi, Lianghua[3] Zhang, Xudong[1]

第一作者：Shu, Qi

通信作者：Gao, SH[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[2]Shandong Agr Univ, Coll Forestry, Tai An 271018, Peoples R China;[3]Int Ctr Bamboo & Rattan, Beijing Bamboo & Rattan Sci & Technol, Key Lab, Natl Forestry & Grassland Adm, Beijing 100102, Peoples R China

年份：2025

卷号：15

期号：3

外文期刊名：AGRICULTURE-BASEL

收录：;Scopus(收录号：2-s2.0-85217771170);WOS:【SCI-EXPANDED(收录号:WOS:001418472700001)】；

基金：This research was funded by the National Key R&D Program of China (grant number 2022YFF130300203).

语种：英文

外文关键词：fertilization; carbon-nitrogen coupling; microbial communities; microbial necromass

摘要：Carbon-nitrogen (C-N) coupling is a fundamental concept in ecosystem ecology. Long-term excessive fertilization in tea plantations has caused soil C-N imbalance, leading to ecological issues. Understanding soil C-N coupling under nitrogen loading is essential for sustainable management, yet the mechanisms remain unclear. This study examined C-N coupling in tea plantation soils under five fertilization regimes: no fertilization, chemical fertilizer, chemical + organic cake fertilizer, chemical + microbial fertilizer, and chemical + biochar. Fertilization mainly increased particulate organic carbon (POC) and inorganic nitrogen, driven by changes in bacterial community composition and function. Mixed fertilization treatments enhanced the association between bacterial communities and soil properties, increasing ecological complexity without altering overall trends. Fungal communities had a minor influence on soil C-N dynamics. Microbial necromass carbon (MNC) and microbial carbon pump (MCP) efficacy, representing long-term carbon storage potential, showed minimal responses to short-term fertilization. However, the microbial necromass accumulation coefficient (NAC) was nitrogen-sensitive, indicating short-term responses. PLS-PM analysis revealed consistent C-N coupling across the treatments, where soil nitrogen influenced carbon through enzyme activity and MCP, while bacterial communities directly affected carbon storage. These findings provide insights for precise soil C-N management and sustainable tea plantation practices under climate change.