Long-term fertilisation reveals close associations between soil organic carbon composition and microbial traits at aggregate scales
文献类型： 外文期刊
作者： Duan, Yan 1 ; Chen, Lin 1 ; Zhang, Jiabao 1 ; Li, Daming 3 ; Han, Xiaori 4 ; Zhu, Bo 5 ; Li, Yan 6 ; Zhao, Bingjian 7 ; Huan 1 ;
作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Fengqiu Expt Stn Natl Ecosyst Res Network China, Nanjing 210008, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Jiangxi Inst Red Soil, Jinxian 331717, Peoples R China
4.Shenyang Agr Univ, Coll Land & Environm, Shenyang 110866, Peoples R China
5.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
6.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China
7.Xinjiang Inst Land & Resources Planning, Urumqi 830011, Peoples R China
8.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China
关键词： Fertilisation; Aggregate; Soil organic carbon; Microbial community; Cellulose-degrading genes
期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）
ISSN： 0167-8809
年卷期： 2021 年 306 卷
页码：
收录情况： SCI
摘要： Fertilisation plays key roles in soil organic carbon (SOC) formation and stabilization by regulating a range of microbial traits. However, little is known about the relationships between SOC composition and microbial traits under long-term fertilisation at aggregate scales. Here, we selected four long-term fertilisation field experiments in China to evaluate the potential associations between SOC composition and microbial traits within aggregates. The four experiments have been treated for more than 25 years with inorganic nitrogen (N), phosphorus (P) and potassium (K) fertilisers (NPK), organic manure (M), and NPK plus M (NPKM). After aggregate isolation, SOC physical fractions including free particulate organic carbon (fPOC), occluded particulate organic carbon (oPOC) and mineral organic carbon (MOC) was measured via density fractionation. SOC chemical structure was determined by C-13 nuclear magnetic resonance, and the bacterial community composition was analysed using amplicon sequencing of the 16S rRNA genes. The results showed that fertilisation increased the contents of free particulate organic carbon (fPOC) and occluded particulate organic carbon (oPOC) while decreasing the relative abundance of aromatic C in macroaggregates. Irrespective of fertilisation regime, the relative abundance of cellulose-degrading genes (cbhI and GH48 genes) was higher in the clay and silt fractions than in the macroand microaggregates. Structural equation modeling indicated that SOC chemical structure was associated with pHdriving shifts in bacterial community composition, and its physical fractions were associated with soil nutrients-induced (mainly total N and P) changes in cellulose-degrading genes and specific taxa in macroaggregates. Finally, we conclude that fertilisation changed soil pH and total N, which were the major drivers affecting the SOC physical fractions and chemical structure, and the effects were caused by altering the bacterial community composition and fungal genes involved in C cycling within soil aggregates following long-term fertilisation.
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