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- W4285404220 endingPage "108778" @default.
- W4285404220 startingPage "108778" @default.
- W4285404220 abstract "Amendment of soil with biochar induces a shift in microbial community structure and promotes faster mineralization of soil organic carbon (SOC), thus offsetting C sequestration effects. Whether biochar induces losses of labile or persistent SOC pools remains largely unknown, and the responsible decomposers await identification. Towards addressing these ends, a C3 soil was amended with Biochar 500 or Biochar 600 (pyrolyzed at 500 °C and 600 °C, respectively) produced from a C4-maize feedstock and incubated for 28 days. Combination of stable isotope 13 C techniques, high-throughput sequencing and Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR MS) allowed changes in soil chemodiversity and biodiversity, as well as their interactive effects on biochar induced SOC mineralization to be elucidated. Results indicated that: i) biochar addition shifted the bacterial community towards dominance of Gemmatimonadetes, Bacteroidia, Alphaproteobacteria and Gammaproteobacteria classes, and coincidence with recalcitrant C components and neutral pH soil; ii) the persistent DOM components (such as condensed aromatics and tannin) were depleted in biochar amended soils, while labile DOM components (such as unsaturated hydrocarbons, lipids, carbohydrates and proteins/amino sugar) were relatively enriched, and; iii) Biochar 600 promoted additional soil derived CO 2 carbon loss over 28 days (93 mg C kg −1 soil). Collectively, these results suggested that the majority of soil derived CO 2 efflux in biochar amended soils originated from recalcitrant components that were mineralized by the persistent organic matter decomposers. This research highlights the significance of biochar responsive taxa in changes of DOM chemodiversity and potential loss of SOC via mineralization. • Bacterial taxa were associated with DOM composition in biochar amended soils. • DOM persistent components were depleted in soil with biochar after 28-day incubation. • Soil with biochar was dominated by A-strategists due to changed resources and stress. • Biochar caused mineralization of DOM persistent components by A-strategists." @default.
- W4285404220 created "2022-07-14" @default.
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- W4285404220 date "2022-09-01" @default.
- W4285404220 modified "2023-10-16" @default.
- W4285404220 title "Biochar induces mineralization of soil recalcitrant components by activation of biochar responsive bacteria groups" @default.
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