[en] Long-term fertilization alters soil microbiological properties and then affects the soil organic carbon (SOC) pool. However, the interrelations of SOC with biological drivers and their relative importance are rarely analyzed quantitatively at aggregate scale. We investigated the contribution of soil microbial biomass, diversity, and enzyme activity to C pool in soil aggregate fractions (>5 mm, 2–5 mm, 1–2 mm, 0.25–1 mm, and <0.25 mm) at topsoil (0–15 cm) from a 27-year long-term fertilization regime. Compared to CK (no fertilization management), NP (inorganic fertilization alone) decreased all of the microbial groups’ biomass, while NPS and NPM (inorganic fertilization plus the incorporation of maize straw or composted cow manure) significantly reduced this negative effect of NP on microbial biomass and increased the microbial contribution to C pool. The results show that microbial variables were significantly correlated with SOC content in >0.25 mm aggregates rather than in <0.25 mm aggregates. Fungal variables (fungal, AM biomass, and F/B ratio) and enzyme activities (BXYL and LAP) in >0.25 mm aggregates explained 21% and 2% of C, respectively. Overall, organic matter addition could contribute to higher C storage by boosting fungal community and enzyme activity rather than by changing microbial community diversity in macro-aggregates.
Disciplines :
Agriculture & agronomy
Author, co-author :
Lu, Jinjing ; Université de Liège - ULiège > Université de Liège - ULiège ; Institute of Eco-Environmental Industrial Technology Research, Shanxi Agricultural University, Taiyuan, China ; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
Li, Shengping; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China ; TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
Liang, Guopeng ; Department of Biology, Utah State University, Logan, United States
Wu, Xueping; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
Zhang, Qiang; Institute of Eco-Environmental Industrial Technology Research, Shanxi Agricultural University, Taiyuan, China
Gao, Chunhua; Institute of Eco-Environmental Industrial Technology Research, Shanxi Agricultural University, Taiyuan, China
Li, Jianhua; Institute of Eco-Environmental Industrial Technology Research, Shanxi Agricultural University, Taiyuan, China
Jin, Dongsheng; Institute of Eco-Environmental Industrial Technology Research, Shanxi Agricultural University, Taiyuan, China
Zheng, Fengjun; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
Zhang, Mengni ; Université de Liège - ULiège > TERRA Research Centre ; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
Abdelrhman, Ahmed Ali; Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
Degré, Aurore ; Université de Liège - ULiège > TERRA Research Centre > Echanges Eau - Sol - Plantes
Language :
English
Title :
The contribution of microorganisms to soil organic carbon accumulation under fertilization varies among aggregate size classes
This research was funded by National Natural Science Foundation of China (U1710255), Fundamental Research Funds for Central Nonprofit Scientific Institution (1610132019033), National Key Research and Development Program of China (2018YFE0112300 and 2018YFD0200408), Agricultural Science and Technology Innovation Research Program of Shanxi Academy of Agricultural Sciences (YCX2018DZYS02), and the Doctoral research initiation project of Shanxi Agricultural University(2021BQ48).
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