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Spatio-temporal microbial regulation of aggregate-associated priming effects under contrasting tillage practices

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Title Spatio-temporal microbial regulation of aggregate-associated priming effects under contrasting tillage practices
 
Creator Zhang, Yeye
 
Contributor Ren, Yunfei
Zhou, Shenglin
Ning, Xiaoyu
Wang, Xiu‐Kang
Yang, Yanming
Sun, Shikun
Nangia, Vinay
Bahn, Michael
Han, Juan
Liu, Yang
Xiong, You‐Cai
Liao, Yuncheng
Mo, Fei
 
Subject microbial communities
spatio-temporal dynamics
tillage intensity
 
Description Tillage intensity significantly influences the heterogeneous distribution and dynamic changes of soil microorganisms, consequently shaping spatio-temporal patterns of SOC decomposition. However, little is known about the microbial mechanisms by which tillage intensity regulates the priming effect (PE) dynamics in heterogeneous spatial environments such as aggregates. Herein, a microcosm experiment was established by adding 13C-labeled straw residue to three distinct aggregate-size classes (i.e., mega-, macro-, and micro-aggregates) from two long-term contrasting tillage histories (no-till [NT] and conventional plow tillage [CT]) for 160 days to observe the spatio-temporal variations in PE. Metagenomic sequencing and Fourier transform mid-infrared techniques were used to assess the relative importance of C-degrading functional genes, microbial community succession, and SOC chemical composition in the aggregate-associated PE dynamics during straw decomposition. Spatially, straw addition induced a positive PE for all aggregates, with stronger PE occurring in larger aggregates, especially in CT soil compared to NT soil. Larger aggregates have more unique microbial communities enriched in genes for simple C degradation (e.g., E5.1.3.6, E2.4.1.7, pmm-pgm, and KduD in Nitrosospeera and Burkholderia), contributing to the higher short-term PE; however, CT soils harbored more genes for complex C degradation (e.g., TSTA3, fcl, pmm-pgm, and K06871 in Gammaproteobacteria and Phycicoccus), supporting a stronger long-term PE. Temporally, soil aggregates played a significant role in the early-stage PEs (i.e., < 59 days after residue addition) through co-metabolism and nitrogen (N) mining, as evidenced by the increased microbial biomass C and dissolved organic C (DOC) and reduced inorganic N with increasing aggregate-size class. At a later stage, however, the legacy effect of tillage histories controlled the PEs via microbial stoichiometry decomposition, as suggested by the higher DOC-to-inorganic N and DOC-to-available P stoichiometries in CT than NT. Our study underscores the importance of incorporating both spatial and temporal microbial dynamics for a comprehensive understanding of the mechanisms underlying SOC priming, especially in the context of long-term contrasting tillage practices.
 
Date 2024-08-22T19:34:32Z
2024-08-22T19:34:32Z
 
Type Journal Article
 
Identifier https://mel.cgiar.org/dspace/limited
Yeye Zhang, Yunfei Ren, Shenglin Zhou, Xiaoyu Ning, Xiu‐Kang Wang, Yanming Yang, Shikun Sun, Vinay Nangia, Michael Bahn, Juan Han, Yang Liu, You‐Cai Xiong, Yuncheng Liao, Fei Mo. (15/5/2024). Spatio-temporal microbial regulation of aggregate-associated priming effects under contrasting tillage practices. Science of the Total Environment, 925.
https://hdl.handle.net/20.500.11766/69492
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Language en
 
Format PDF
 
Publisher Elsevier (12 months)
 
Source Science of the Total Environment;925,(2024)