Soil CO2 and CH4 response to experimental warming under various tree species compositions in a temperate harwood forest

Discover Soil., Journal Year: 2025, Volume and Issue: 2(1)

Published: March 11, 2025

Under climate change, some forest ecosystems appear to be transitioning into net source of carbon dioxide (CO2), raising questions about the future role soil respiration rate (Rs), which depends on hydroclimatic conditions. Conversely, well-drained soils could become more significant sinks methane (CH4) under warming. The main objective this study was assess effects artificial warming Rs and CH4 fluxes in a sugar maple at northern limit Quebec temperate deciduous forests eastern Canada, evaluate effect species composition response We measured during snow-free period 2021 2022 32 plots distributed across three types, half were artificially heated by approximately 2 °C with heating cables. Forest very consistent sink for it did not respond nor sensitive variations moisture, ionic activity solution types. However, we observed an increase plots, but only up threshold 15 °C, beyond started slow down respect control plots. also weakening exponential relationship between temperature threshold. This trend varied hardwood-beech stands being than mixedwoods other hardwoods. greater resulted downshift Rs, starting from colder threshold, around 10–12 °C. highlights potential plateauing despite rising temperature, least Canada's forest, vary one type another.

Language: Английский

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Long-term warming of a forest soil reduces microbial biomass and its carbon and nitrogen use efficiencies

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 184, P. 109109 - 109109

Published: June 24, 2023

Global warming impacts biogeochemical cycles in terrestrial ecosystems, but it is still unclear how the simultaneous cycling of carbon (C) and nitrogen (N) soils could be affected longer-term. Here, we evaluated 14 years soil (+4 °C) C N cycle across different depths seasons a temperate mountain forest. We used H218O incorporation into DNA 15N isotope pool dilution techniques to determine gross rates transformation processes. Our data showed effects on cycling, these were consistent seasons. Warming decreased microbial biomass (−22%), at same time increased biomass-specific growth (+25%) respiration (+39%), potential activity β-glucosidase (+31%), turnover (+14%). reduced protein depolymerization (−19%), stimulated mineralization (+63%) activities N-acetylglucosaminidase (+106%) leucine-aminopeptidase (+46%), had no impact nitrification (+1%). Microbial use efficiencies both lower treatment (−15% −17%, respectively). Overall, our results suggest that long-term drives microbes incorporate less their (and necromass), release more inorganic environment, causing storage this forest, as indicated by total contents. The decreases CUE NUE likely triggered increasing P constraints warmed soils, limiting anabolic processes promoting pervasive losses from soil.

Language: Английский

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Contrasting effects of litter and root removals on soil N2O emissions of an evergreen broadleaved forest in southeastern China

Applied Soil Ecology, Journal Year: 2025, Volume and Issue: 206, P. 105867 - 105867

Published: Jan. 10, 2025

Language: Английский

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Microbial mechanisms of interactive climate-driven changes in soil N2O and CH4 fluxes: A global meta-analysis

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 376, P. 124380 - 124380

Published: Feb. 15, 2025

Language: Английский

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Higher temperature sensitivity of forest soil methane oxidation in colder climates

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 11, 2025

Forest soils, serving as an important sink for atmospheric methane (CH4), modulate the global CH4 budget. However, direction and magnitude of forest soil under warming remain uncertain, partly because temperature response microbial oxidation varies substantially across geographical scales. Here, we reveal spatial variation in to warming, along with driving factors, 84 sites spanning a broad latitudinal gradient eastern China. Our results show that sensitivity significantly declines increasing site mean annual temperature, range 0.03 0.77 μg g–1 d–1 °C–1. Moreover, resources type II methanotrophs play crucial roles shaping oxidation. findings highlight importance incorporating climate, resources, methanotroph groups into biogeochemical models more realistically predict warming. soils are vital regulating budget, but their spatially. The authors assess China, finding higher colder regions, indicating greater potential these areas

Language: Английский

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Field Warming‐Based Observations Reveal Constrained Apparent Temperature Sensitivities of Cropland N₂O Emissions

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(8)

Published: April 11, 2025

Abstract The response of nitrous oxide (N 2 O) emissions to warming is critical for accurately projecting nitrogen‐climate feedback. Compelling evidences have shown that N O are temperature dependent, offering insights into their intrinsic sensitivity. However, when extrapolating from laboratory‐controlled field‐ambient conditions, it remains unclear how this sensitivity varied across cropland fields subject diverse environmental and anthropogenic constraints. We performed a comprehensive meta‐analysis 144 field‐warming observations worldwide, aiming address the magnitude, heterogeneity, drivers such apparent results showed mean growing‐season field‐scale were not strongly dependent with low averaged activation energy (0.32 eV) compared laboratory‐scale (0.62 eV). At site levels, spatial variation in was primarily driven by interactions nitrogen fertilization, edaphic, climatic variables. This analysis also identified crucial yet frequently overlooked role soil pH nonlinearly modulating Our findings provide evidence understanding climate feedback capturing soil‐climate‐management constrained highlight importance incorporating these constraints models improve prediction accuracy.

Language: Английский

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Impacts of Permafrost Degradation on N₂O Emissions From Natural Terrestrial Ecosystems in Northern High Latitudes: A Process‐Based Biogeochemistry Model Analysis

Global Biogeochemical Cycles, Journal Year: 2025, Volume and Issue: 39(4)

Published: April 1, 2025

Abstract Nitrous oxide (N 2 O) is a potent greenhouse gas with its radiative forcing 265–298 times stronger than that of carbon dioxide (CO ). Recent field studies show N O emissions from northern high latitude (north 45°N) ecosystems have increased due to warming. However, spatiotemporal quantification remains inadequate in this region. Here we revise the Terrestrial Ecosystem Model incorporate more detailed processes soil nitrogen (N) biogeochemical cycling, permafrost thawing effects, and atmospheric deposition. then used analyze natural terrestrial Our study reveals regional production net 1969 2019. Production rose 1.12 (0.82–1.46) 1.18 (0.84–1.51) Tg yr −1 , while 0.98 (0.7–1.34) 1.05 (0.72–1.39) considering thawing. Emissions regions grew 0.37 (0.2–0.57) 0.41 (0.21–0.6) . Soil uptake atmosphere remained relatively stable at 0.12 (0.1–0.15) Atmospheric deposition significantly emission by 37.2 ± 2.9%. Spatially, act as sources or sinks −12 900 mg m −2 depending on changing temperature, precipitation, characteristics, vegetation types. findings underscore critical need for observational reduce uncertainty budget.

Language: Английский

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Soil warming-induced reduction in water content enhanced methane uptake at different soil depths in a subtropical forest

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 927, P. 171994 - 171994

Published: March 30, 2024

Language: Английский

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Effects of whole‐soil warming on CH₄ and N₂O fluxes in an alpine grassland

Global Change Biology, Journal Year: 2023, Volume and Issue: 30(1)

Published: Dec. 8, 2023

Global climate warming could affect the methane (CH

Language: Английский

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Global latitudinal patterns in forest ecosystem nitrous oxide emissions are related to hydroclimate

npj Climate and Atmospheric Science, Journal Year: 2024, Volume and Issue: 7(1)

Published: Aug. 15, 2024

Nitrous oxide (N2O) emissions are a serious global issue, with substantial evidence indicating that hydroclimate processes significantly contribute to these emissions. Forests, covering one-third of land, key in the water cycle and influence processes, which vary climate, latitude, forest types. The role regulating N2O emission remains largely unknown. Our analysis shows factors dominate latitudinal gradient fluxes, decrease latitude. fluxes highest tropical forests, followed by temperate boreal forests. Hydroclimate 78.2% while soil 21.8%. results urgently call for future studies investigate relationship between flux like radiation, evapotranspiration, vapor pressure deficits. Collectively, findings highlight significant impact on suggest incorporating into predictive models greater accuracy.

Language: Английский

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