Biogeochemistry最新文献

{"title":"Minimal thermal adaptation of soil extracellular enzyme activities along a long-term geothermal gradient","authors":"Erica J. Prentice,Vickery L. Arcus,Louis A. Schipper,Charlotte J. Alster","doi":"10.1007/s10533-026-01369-1","DOIUrl":"https://doi.org/10.1007/s10533-026-01369-1","url":null,"abstract":"Abstract Changes in soil nutrient cycling with warming are dependent on differing thermal responses and adaptation strategies of soil microbial communities and the interactions between substrate acquisition through extracellular enzyme activity and utilisation via respiration, metabolism and biomass accumulation. Understanding these processes is complicated by the complexity and variability of soil systems, along with differences in methodologies quantifying adaptation of soil microbial processes. Here we aimed to investigate thermal adaptation for extracellular enzyme activity of three enzyme classes (β-glucosidases, β-N-acetylglucosaminidases and phosphatases) using soils from a field setting with different mean annual temperatures across a long term (> 20 year) geothermal gradient in New Zealand. Extracellular enzyme thermal responses showed increasing rates up to the highest characterised temperature (60 °C) regardless of mean annual soil temperature and minimal adaptation across the gradient for parameters such as activation energy, curvature, and the optimum and minimum temperature of activity. These results are in direct contrast to the previously measured thermal response of respiration and growth rates measured at this site which have an optimum temperature of activity around 30–45 °C and show measurable rates of adaptation across the thermal gradient. This divergence in the thermal response of soil substrate depolymerisation via extracellular enzyme activity compared to respiration and growth rates raises questions around future nutrient bioavailability and utilisation if these two process are decoupled at elevated temperatures under future soil warming.","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"45 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The land and water costs of the “green energy” transition","authors":"Paolo D’Odorico,&nbsp;Maria Cristina Rulli","doi":"10.1007/s10533-026-01358-4","DOIUrl":"10.1007/s10533-026-01358-4","url":null,"abstract":"<div><p>The transition to renewable energy sources is expected to reduce anthropogenic greenhouse gas emissions and the associated impacts on global climate but it entails an increased human pressure on land and water resources. Here we evaluate the associated shift in environmental costs from climate warming to increased human use of land and water. We evaluate the tradeoffs inherent to the different carbon, land, and water footprints of fossil vs renewable energy sources at local and global scales. While with the industrial revolution human reliance on fossil fuels has coupled economic growth to global CO2 emissions, it has greatly decoupled the energy system from land and water use. Conversely, the transition to renewable (or “green”) energy is now recoupling energy production to local land (and water) use.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 4","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-026-01358-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrate and sulfate isotopic compositions reveal patterns of production and loss in stream corridors draining agricultural landscapes","authors":"Caitlin M. Mayernik,&nbsp;Stephanie A. Ewing,&nbsp;Robert A. Payn","doi":"10.1007/s10533-026-01311-5","DOIUrl":"10.1007/s10533-026-01311-5","url":null,"abstract":"<div><p>Stream corridors play a critical role in reducing contaminant export, yet limited understanding of controls on riparian biogeochemical processes hinders effective water quality management. To infer outcomes from riparian biogeochemical processes, we analyzed nitrate and sulfate abundance and isotopic composition in water samples from upland groundwater, riparian groundwater, and stream water across three ca. 0.7-km reaches draining an extensively cultivated terrace landform. Nitrate showed net loss from upland groundwaters to stream water, with stream samples having nitrate-δ¹⁵N and δ¹⁸O values up to ca. <span>(+)</span>12‰ and <span>(+)</span>2‰, respectively, and lower nitrate concentrations (ca. 3 mg L⁻¹) than terrace groundwater inflows (ca. 20 mg N L⁻¹). Riparian groundwater samples had nitrate-δ¹⁵N and δ¹⁸O values up to <span>(+)</span>40‰ and <span>(+)</span>15‰, respectively, with low concentrations near 1 mg N L⁻¹, indicating loss along riparian flow paths. Sulfate showed net gains in concentration, with stream water having low sulfate-δ³⁴S values (ca. <span>(-)</span>18‰) compared with terrace groundwater (ca. <span>(-)</span>10‰), and high sulfate-δ¹⁸O values (up to <span>(+)</span>6‰) compared to ambient riparian groundwater (water-δ¹⁸O: <span>(-)</span>20 to <span>(-)</span>14‰). These results suggest that sulfide oxidation during marine shale weathering is cycled through redox transformations under fluctuating saturation conditions in riparian systems. We use relationships in abundance and isotopic composition from uplands to streams to constrain the potential magnitude of gross gains and losses influencing observed net sulfate gains and nitrate losses. Our findings highlight how losses, gains, and mixing processes influence water quality through solute loss to gaseous phases, solute production in the riparian system, and redox cycling in stream corridors.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 4","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-026-01311-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148552205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Airborne and everywhere: evolving role of the modern dust cycle in the earth system","authors":"Bopaiah A. Biddanda,&nbsp;Juan Manuel González-Olalla","doi":"10.1007/s10533-026-01339-7","DOIUrl":"10.1007/s10533-026-01339-7","url":null,"abstract":"<div><p>Dust has played a critical role throughout Earth’s origin and evolution and continues to do so in the present. The expanding scale and increasing pace of anthropogenic activities over the last few centuries have resulted in a dustier 21st-century world that influences all aspects of planetary life, from personal health to global biogeochemical cycling of elements and climate. In recent years, measurements and models have advanced our understanding of global dust flux. However, uncertainties remain over the quantification and role of low-level emissions and depositions, episodic and extreme dust events, high-latitude dust, bioaerosols, and anthropogenic dust. Furthermore, the ecological consequences of dust loss to source regions, its reactivity in the atmosphere, and dust gain in depositional ecosystems remain underappreciated. Even as dust influences climate and the changing climate impacts dust in a feedback loop, several aspects of the dust life cycle, such as the role of dust in the global carbon cycle and the contribution of anthropogenic dust to Earth’s radiation budget, remain poorly constrained. In a world wherein the continents are measurably losing freshwater and soil moisture (undergoing aridification), and wildland and urban fires are increasing in frequency and intensity, dust is emerging as a major player at local, regional, and global scales. Nevertheless, dust remains an underappreciated and understudied component of global biogeochemical cycles (especially its role in biospheric productivity) and climate models (especially its role in climate feedback). This commentary aims to inform, intrigue, and challenge Earth scientists to pursue research on the fast-evolving modern dust cycle—its sources, sinks, fluxes, size distribution, composition, abundance, reactivity, consequences, and fate in the Earth system<i>.</i></p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 5","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-026-01339-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Iron focusing and sulphur-driven mineral formation regulate phosphorus sequestration in Lake Stechlin (NE Germany)","authors":"Grzegorz Scholtysik,&nbsp;Lena Heinrich,&nbsp;Helge Wolfgang Arz,&nbsp;Matthias Moros,&nbsp;Thomas Gonsiorczyk,&nbsp;Volker Thiel,&nbsp;Michael Hupfer","doi":"10.1007/s10533-026-01347-7","DOIUrl":"10.1007/s10533-026-01347-7","url":null,"abstract":"<div><p>Iron (Fe) plays a key role in lake ecosystems by regulating the availability of phosphorus (P) as a limiting factor for primary production. This study investigates how microbial sulphate reduction in Lake Stechlin, a dimictic and initially oligotrophic lake in northeast Germany (zₘₐₓ = 69.5 m), has altered the mobility of Fe and P over several decades. Using long-term monitoring data combined with sedimentological investigations, the study examines long-term geochemical focusing, defined as the net accumulation of redox-mobilised Fe in the deepest basin driven by reductive dissolution, lateral transport, and re-precipitation. Under oligotrophic conditions prior to the 1960s, focusing of Fe toward the deepest site likely involved: (1) reductive dissolution of sedimentary Fe oxides in shallow areas, (2) diffusion of dissolved Fe into overlying water, (3) re-oxidation/complexation and stepwise lateral transport within the water column, and (4) final deposition and burial at the deepest zone. Chemical and mineralogical evidence indicates that Fe burial was facilitated by authigenic formation of stable Fe(II) minerals, most likely ankerite (CaFe[CO₃]₂) and vivianite (Fe₃[PO₄]₂·8H₂O). Fe enrichment at the deepest site has strongly weakened, coinciding with intensified pyrite (FeS₂) formation in anoxic littoral and profundal sediments. This shift was likely driven by sufficient supply of organic matter and elevated sulphate inputs, which stimulated microbial sulphate reduction. Elevated S/Fe ratios indicate that sulphide efficiently competed with P for binding to Fe, potentially increasing susceptibility to external and internal P loading.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-026-01347-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manure application magnifies methane emission from drainage ditch sediments","authors":"Quinten Struik,&nbsp;Madison Cicha,&nbsp;José R. Paranaíba,&nbsp;Sarian Kosten,&nbsp;Annelies J. Veraart","doi":"10.1007/s10533-026-01348-6","DOIUrl":"10.1007/s10533-026-01348-6","url":null,"abstract":"<div><p>Agricultural drainage ditches have been recently identified as hotspots of methane (CH₄), carbon dioxide (CO₂), and nitrous oxide (N₂O) emissions. Ditches often experience inputs of fertilizers from adjacent agricultural fields, which increases the availability of organic carbon and nutrients in ditch sediments, thereby fueling greenhouse gas (GHG) production. Here, we quantify the effects of two types of fertilizers (manure and artificial fertilizer) on GHG dynamics from agricultural drainage ditch sediments subjected to oxic and anoxic conditions. We first measured rates of potential sediment N₂O production, CH₄ production, and aerobic CH₄ oxidation under different fertilizer doses. We observed that manure additions (expressed here as ammonium (NH₄⁺) dose, referring to the resulting NH₄⁺ concentration in a given bottle after addition) strongly stimulated CH₄ and N₂O production. Methane production rates increased approximately threefold as a result of manure additions, ranging from 18.4 to 61.7 µmol CH₄ gDW⁻¹ d⁻¹, whereas N₂O production rates increased approximately 16-fold, and varied from 0.1 to 1.6 µmol N₂O gDW⁻¹ d⁻¹ across manure doses. Aerobic CH₄ oxidation was also stimulated by manure addition, while at resulting NH₄⁺ concentrations above 2 mmol L⁻¹, oxidation rates declined. In contrast, artificial fertilizer caused immediate inhibition of CH₄ and N₂O production and aerobic CH₄ oxidation, even at the lowest NH₄⁺ concentration tested (0.05 mmol L⁻¹). Focusing on the effects of manure on GHG emissions, we observed that under anoxic conditions, sediment cores receiving high manure inputs emitted approximately 3.5 times more GHGs (in CO₂-equivalents) than anoxic controls (no manure) and about 5.5 times more than oxic controls. Methane was the dominant driver of increased emissions at higher manure doses. As fertilizer use continues to rise globally, these results highlight the importance of implementing climate-smart water and nutrient management strategies in ditches and adjacent grasslands to mitigate climate trade-offs.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 4","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13442480/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148683286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Winter and summer phytoplankton peaks in Gwangyang Bay, South Korea: a physical-biogeochemical model study","authors":"Seunghwa Chae,&nbsp;Yang-Ki Cho,&nbsp;Bong-Gwan Kim,&nbsp;Yong-Jin Tak,&nbsp;Myeong-Taek Kwak,&nbsp;Yoonja Kang","doi":"10.1007/s10533-026-01346-8","DOIUrl":"10.1007/s10533-026-01346-8","url":null,"abstract":"<div><p>Phytoplankton in temperate regions typically exhibit spring and fall bloom patterns driven by interactions between physical and biogeochemical factors. In contrast, Gwangyang Bay, located along the southern coast of Korea, is a prominent bay exhibiting estuarine phenology, characterized by distinct peaks in winter and summer. To investigate the mechanisms underlying these uncommon bloom peaks, we employed a coupled physical–biogeochemical model that integrates the Regional Ocean Modeling System (ROMS) with a low-trophic ecosystem module, incorporating size-structured phytoplankton and zooplankton dynamics. The model simulated the temporal and spatial evolution of phytoplankton biomass and nutrient distributions under forcing averaged over the 2007–2015 period, and a suite of sensitivity experiments was performed to isolate the roles of temperature, light attenuation, shortwave radiation, wind, and riverine nutrient inputs. The model successfully reproduced observed seasonal patterns in temperature, nutrients, dissolved oxygen, and chlorophyll <i>a</i> concentrations. Summer blooms were driven by elevated dissolved inorganic nitrogen (DIN) loading from river discharge and high water temperatures, which collectively stimulated the growth of small-sized phytoplankton. Winter blooms, in contrast, were driven by large-sized phytoplankton growth under moderate nutrient conditions and low grazing of zooplankton due to low temperature. The vertical and horizontal structure of phytoplankton distributions was influenced by stratification patterns, with residence time and light availability playing secondary roles. Sensitivity experiments demonstrated that seasonality of water temperature and riverine DIN supply are critical for reproducing the observed seasonal bloom pattern. The results underscore the importance of size-specific traits and temperature-nutrient interactions in shaping seasonal phytoplankton dynamics in complex estuarine-bay environments.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 4","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-026-01346-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrologic connectivity with peatland soils drives very high carbon fluxes in a tropical, mountain stream","authors":"Keridwen M. Whitmore,&nbsp;Amanda G. DelVecchia,&nbsp;Ricardo Jaramillo,&nbsp;Segundo Chimbolema,&nbsp;Esteban Suárez,&nbsp;Diego A. Riveros-Iregui","doi":"10.1007/s10533-026-01327-x","DOIUrl":"10.1007/s10533-026-01327-x","url":null,"abstract":"<div><p>Inland waters receive large quantities of carbon from the surrounding landscape and are active sites of carbon transport, transformation, and emission. Global carbon emission estimates are limited by sparse and unevenly distributed carbon flux observations, particularly in the tropics. We evaluated hydrological and metabolic controls on carbon export variability from a large peatland in a tropical ecosystem typical of the Northern Andes mountains. We recorded dissolved CO₂ (<i>p</i>CO₂), dissolved oxygen (DO), and discharge at 15-min intervals 5 m downstream of a peatland outlet (Station 1) and at 3 additional locations downstream (Stations 2, 3 and 4) from July 2019 until Jan 2020 and from June 2021 until March 2023. Continuous measurements of DO and discharge were also measured 2 km away in a stream draining an adjoining catchment (Station 5). Discrete measurements of dissolved organic carbon (DOC) and dissolved methane (<i>p</i>CH₄) were collected in June-July of 2021 and 2022. Stream discharge was a primary control on <i>p</i>CO₂ and DOC in the stream network at both seasonal and event scales. DOC concentration increased with discharge and while <i>p</i>CO₂ decreased during higher flows, CO₂ loading increased. Pronounced seasonal changes were observed with lowest <i>p</i>CO₂ recorded at the peatland outlet in wet months (June–August: 5845 ± 2325 ppm, mean ± standard deviation), and the highest in dry months (Nov-Feb, 16,677 ± 3685 ppm). Anoxic or hypoxic conditions persisted for over half of our study and measurements of <i>p</i>CH₄ at the peatland outlet were very high (982 ± 797 ppm), underscoring the importance of anaerobic activity in this system. Aerobic processes also influenced <i>p</i>CO₂ dynamics. Aquatic metabolism at Station 5 (29 July–19 Oct 2021) was net heterotrophic, with ER exceeding GPP and net <i>p</i>CO₂ production (mean ER: − 6.5 g O₂ m⁻² d⁻¹, GPP: 0.44 g O m⁻² d⁻¹). Our study highlights the role of hydrologic connectivity and diverse biogeochemical processes in shaping carbon export and cycling in páramo streams, which results in <i>p</i>CO₂ and <i>p</i>CH₄ levels among the highest reported in streams and rivers worldwide.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-026-01327-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrating field, mesocosms, and laboratory approaches to characterise denitrification-driven nitrous oxide hot moments in European wetlands","authors":"Thomas Crestey-Chury,&nbsp;Romain Darnajoux,&nbsp;Sabine Sauvage,&nbsp;Mika Aurela,&nbsp;Thierry Camboulive,&nbsp;Noémie Carles,&nbsp;Tom De Dobbelaer,&nbsp;Laura Escarmena,&nbsp;Laure Gandois,&nbsp;Jyrki Jauhiainen,&nbsp;Sari Juutinen,&nbsp;Tuula Larmola,&nbsp;Ülo Mander,&nbsp;Sílvia Poblador,&nbsp;Maud Raman,&nbsp;Francesc Sabater,&nbsp;Thomas Schindler,&nbsp;Kaido Soosaar,&nbsp;Liisa Ukonmaanaho,&nbsp;José-Miguel Sánchez-Pérez","doi":"10.1007/s10533-026-01343-x","DOIUrl":"10.1007/s10533-026-01343-x","url":null,"abstract":"<div><p>A substantial part of terrestrial nitrous oxide (N₂O) emissions originates from denitrification in wetlands, and this contribution is expected to rise with ongoing land-use changes, such as wetland drainage, agricultural conversion, and peatland degradation, as well as under global warming. Capturing the spatial and temporal dynamics of N₂O emissions through measurements and numerical modelling remains challenging, as extreme N₂O peaks occur during short-lived transient events (hot moments). In this study, we combined three experimental approaches (in situ field monitoring, mesocosm experiments, and slurry soil incubations in the laboratory) to characterise N₂O hot moments of denitrification across 21 diverse European wetlands. Each approach captured different aspects of N₂O emission dynamics, and their combination revealed additional features, including the timing and magnitude of N₂O fluxes, denitrification efficiency (ratio of N₂O to N₂O + N₂ emitted), and an estimate of the proportion of soil actively undergoing denitrification. We encourage the use of these key determinants to improve and parametrise future denitrification models that aim to quantify transient N₂O hot moments.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 4","pages":""},"PeriodicalIF":4.3,"publicationDate":"2026-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-026-01343-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wildfire and post-fire management reshape soil microbial guilds and carbon dynamics at a boreal forest site in Sweden","authors":"Margarida Soares,&nbsp;Julia Kelly,&nbsp;Johannes Rousk,&nbsp;Natascha Kljun","doi":"10.1007/s10533-026-01344-w","DOIUrl":"10.1007/s10533-026-01344-w","url":null,"abstract":"<div><p>Wildfires are a natural disturbance shaping boreal forests, but their effects on soil microbial communities and biogeochemical cycling remain unclear, particularly in Fennoscandia. We investigated the impact of fire severity and post-fire management on the soil microbial community two years after a boreal wildfire in Sweden. We quantified growth rates of bacteria, saprotrophic fungi (SF), ectomycorrhizal fungi (EMF), microbial respiration and carbon use efficiency (CUE) in an unburnt control site and areas affected by low- and high-severity fires, where trees were either left standing or salvage-logged. Wildfire and salvage-logging were associated with reduced microbial respiration and shifts in microbial guild structure from ectomycorrhizal to saprotroph dominated soils. Bacterial growth declined after fire and tree removal, and EMF growth was reduced by 20% and 59% following low- and high-severity fires, respectively. Salvage-logging live trees after a low-severity fire more than tripled the activity of SF groups in comparison to EMF. Although SF activity increased post-fire, there was no corresponding rise in soil organic matter (SOM) decomposition. Seasonal variation in CUE was linked to SOM content, with lower CUE in SOM-depleted soils. Despite the disturbance by fire and logging, the cumulative CUE remained unchanged in all treatments over the study period. These findings suggest that reduced carbon emissions and a shift in microbial guilds from mycorrhizal to saprotroph-dominated - may influence the long-term microbial contributions to soil carbon storage and forest recovery.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"169 3","pages":""},"PeriodicalIF":3.7,"publicationDate":"2026-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-026-01344-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148009384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}