Testing the environmental controls of microbial nitrogen-mining induced by semi-continuous labile carbon additions in the subarctic

Soil Biology and Biochemistry, Journal Year: 2022, Volume and Issue: 166, P. 108562 - 108562

Published: Jan. 18, 2022

Climate warming and shrubification will affect soil carbon (C) cycling in arctic ecosystems. Rhizosphere inputs from increased plant productivity by may stimulate the mineralization of old organic matter (SOM), termed "priming effect". However, nitrogen (N) availability due to warming-accelerated mineralization, litter associated with could modulate this response. In study, we investigated how N-availability affects priming SOM subarctic soils adding labile (OM) including 13C-glucose without mineral N, or 13C-alanine, into different N availabilities resulting inorganic and/or addition field-treatments. Rather than as a single pulse addition, OM additions were administered semi-continuously every other day simulate rhizosphere conditions. We found that semi-continuous induced sustained was linked stimulation bacterial fungal growth over time, despite reduced microbial efficiency. The higher C indicating selective N-mining particularly pronounced more N-poor soils. showed declining trend suggesting shift most N-rich compounds less compounds, presumably reservoirs exhausted. effect controlled depending on form OM: Alanine stimulating growth, while glucose lower growth. These results indicate bacteria fungi can both drive Based biomass rates, it be estimated 90% observed changes turnover "old" rather pool (i.e. "real" "apparent" priming). Overall, our findings suggest increase enhanced N-mining, generating positive feedback subarctic. contrast, reduce release through alleviated demand for N.

Language: Английский

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Soil organic matter molecular composition with long‐term detrital alterations is controlled by site‐specific forest properties

Global Change Biology, Journal Year: 2022, Volume and Issue: 29(1), P. 243 - 259

Published: Sept. 28, 2022

Forest ecosystems are important global soil carbon (C) reservoirs, but their capacity to sequester C is susceptible climate change factors that alter the quantity and quality of inputs. To better understand forest responses altered inputs, we integrated three molecular composition published data sets organic matter (SOM) microbial communities for mineral soils after 20 years detrital input removal treatments in two deciduous forests: Bousson (BF), Harvard (HF), a coniferous forest: H.J. Andrews (HJA). Soil turnover times were estimated from radiocarbon measurements compared with molecular-level (based on nuclear magnetic resonance specific analysis plant- microbial-derived compounds) how ecosystem properties control biogeochemistry dynamics. Doubled aboveground litter additions did not increase any forests studied likely due long-term priming. The degree SOM decomposition was higher bacteria-dominated sites nitrogen (N) availability while lower N-poor forest. Litter exclusions significantly decreased C, increased state, led adaptation changes available substrates. Finally, although determined dynamics its (HJA), belowground appeared be more influential broadleaf (BH HF). This synthesis demonstrates inherent regulate manipulations at molecular-level. Across studied, enhance content, whereas reductions negatively impacted concentrations. These results indicate these temperate highly sensitive deposition, which product environmental drivers.

Language: Английский

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Effects of Pb-, Cd-resistant bacterium Pantoea sp. on growth, heavy metal uptake and bacterial communities in oligotrophic growth substrates of Lolium multiflorum Lam

Environmental Science and Pollution Research, Journal Year: 2022, Volume and Issue: 29(33), P. 50742 - 50754

Published: March 3, 2022

Language: Английский

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Rhizosphere influence on microbial functions: consequence for temperature sensitivity of soil organic matter decomposition at early stage of plant growth

Plant and Soil, Journal Year: 2023, Volume and Issue: 494(1-2), P. 95 - 109

Published: Sept. 11, 2023

Language: Английский

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Effects of root litter traits on soil organic matter dynamics depend on decay stage and root branching order

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 180, P. 109008 - 109008

Published: March 16, 2023

Language: Английский

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