Janne Salminen , Jari Hyväluoma , Bartosz Adamczyk , Sylwia Adamczyk , Petri Niemi , Sami Kinnunen , Arttu Miettinen
{"title":"Trophic interactions and microbial-derived carbon in porosphere of arable fields","authors":"Janne Salminen , Jari Hyväluoma , Bartosz Adamczyk , Sylwia Adamczyk , Petri Niemi , Sami Kinnunen , Arttu Miettinen","doi":"10.1016/j.soilbio.2025.109924","DOIUrl":"10.1016/j.soilbio.2025.109924","url":null,"abstract":"<div><div>Soil physical properties, such as porosity, are recognized to play an important role in the formation of soil organism communities and may regulate carbon sequestration in the soil ecosystem. However, despite their eminent importance, the relation between the abundance of soil animals, microbial necromass and pore space has been rarely demonstrated empirically. In this study, soil visible macroporosity (measured using X-ray computed tomography), microbial necromass (a pool of soil organic carbon), and densities of nematode groups were measured in the topsoil layer at a depth of 10 cm in four arable fields in southern Finland (clay and loam soils). Bacterial necromass was positively correlated with visible macroporosity smaller than 428 μm in size. Fungal necromass was marginally correlated (p = 0.059) with pores <233 μm in size. The abundance of bacterial feeding nematodes (and unknown juveniles) scaled positively with microbial necromasses, visible macropores smaller than 700 μm and the total visible macroporosity. The abundance of other feeding groups was independent of soil visible macroporosity. However, trophic interactions between feeding groups of nematodes appeared to be weak in this soil layer. Results indicate strong bottom-up regulation between microbes and microbial feeding nematodes. Microbial necromass, as an important organic fraction in soil, was clearly related to small soil macropores (<428 μm).</div><div>These findings provide novel insights into how soil architecture, particularly macroporosity below 700 μm, influences the spatial ecology of soil organisms — an aspect that has received limited attention in boreal agroecosystems.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"210 ","pages":"Article 109924"},"PeriodicalIF":9.8,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Bright , B. Dienes , M. Keiluweit , C. Rixen , M. Aeppli
{"title":"Climate change impacts on organic carbon cycling in European alpine soils","authors":"K. Bright , B. Dienes , M. Keiluweit , C. Rixen , M. Aeppli","doi":"10.1016/j.soilbio.2025.109891","DOIUrl":"10.1016/j.soilbio.2025.109891","url":null,"abstract":"<div><div>This review focuses on impacts of climate change on soil organic carbon (SOC) cycling in alpine soils, with a specific emphasis on input and loss processes. In alpine regions, low temperatures and variable snow cover govern plant productivity and microbial activity, leading to unique SOC dynamics. However, rising temperatures, altered precipitation patterns, and reduced snow cover threaten to disrupt these processes, potentially leading to significant SOC losses. Changes in vegetation, driven by climatic shifts, further complicate the dynamics of SOC by modifying the quantity and chemical composition of organic inputs into the soil. Furthermore, increased temperatures are expected to accelerate microbial activity, potentially decreasing SOC stocks and increasing carbon losses. How changing loss and input rates alter net effects of climatic changes on SOC stocks remains a persistent knowledge gap. Addressing this gap is critical for predicting carbon cycling in alpine ecosystems and formulating strategies to mitigate climate impacts. This review highlights the urgent need for targeted research on alpine SOC dynamics to better anticipate the response of these susceptible environments in the face of a rapidly changing climate.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"210 ","pages":"Article 109891"},"PeriodicalIF":9.8,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144664494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jingxuan Olivia Chen , Antoine Rocaboy , André Junggebauer , Jing-Zhong Lu , Stefan Scheu
{"title":"Depth-dependent dynamics of microarthropods in forest floors along temperature and soil phosphorus gradients","authors":"Jingxuan Olivia Chen , Antoine Rocaboy , André Junggebauer , Jing-Zhong Lu , Stefan Scheu","doi":"10.1016/j.soilbio.2025.109922","DOIUrl":"10.1016/j.soilbio.2025.109922","url":null,"abstract":"<div><div>Forest floors buffer harsh environmental conditions and insulate soil, thereby mitigating the effect of climate extremes on soil fauna. Conversely, the soil fauna is key for shaping the structure of forest floors. We investigated the distribution patterns of two major decomposer microarthropod groups (Collembola and Oribatida) across the different layers of the forest floor (Ol, Of/Oh) and the upper mineral soil (Ah) of 12 forest sites representing temperature and phosphorus gradients. A total of 58 Collembola and 144 Oribatida species were recorded. Phosphorus as main factor neither significantly affected the abundance of Collembola nor that of Oribatida. Oribatida richness significantly increased with increasing temperature but decreased with increasing phosphorus level. The abundance, richness and biomass of both microarthropod groups were at a maximum in the Of/Oh layer followed by the Ah and Ol layer. Collembola and Oribatida community structure also varied with temperature and phosphorus levels but this depended on layer. We identified soil and litter carbon-to-nitrogen ratio, pH, Gram-positive bacterial phospholipid fatty acids (PLFAs) and thickness of Ol and Of/Oh layers as important drivers for Collembola and Oribatida communities. These findings highlight the critical influence of temperature, phosphorus and forest floor stratification on soil microarthropod communities, alongside additional other soil properties. The differential responses of Collembola and Oribatida to temperature and phosphorus gradients underscore functional and ecological differences between these groups, with Oribatida being more sensitive to climatic and nutrient changes. Overall, the results emphasize the importance of maintaining the structural integrity of forest floors to support diverse and resilient soil fauna communities.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"210 ","pages":"Article 109922"},"PeriodicalIF":9.8,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144652104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tvisha Martin , Sarah Evans , Christine D. Sprunger
{"title":"Early successional systems support nematode community resistance to drought stress","authors":"Tvisha Martin , Sarah Evans , Christine D. Sprunger","doi":"10.1016/j.soilbio.2025.109919","DOIUrl":"10.1016/j.soilbio.2025.109919","url":null,"abstract":"<div><div>Variable rainfall is expected to increase with climate change and will lead to more drought stress. The impact of drought on nematode resistance within agricultural systems that vary in management is unknown. Free-living nematodes can serve as bioindicators of climatic stress because they are sensitive to disturbance and span the <em>r-K</em> strategist continuum. Here we aim to 1) understand how management intensity impacts the resistance of nematode communities to drought and 2) assess how the immediate alleviation of drought impacts nematode communities in contrasting agroecosystems. This study utilized the W.K. Kellogg Biological Station Long-Term Ecological Research trial where three rainfall manipulations were induced (drought, variable, and control) in two land uses (an early successional and a no-till annual row-crop). Sampling for nematode communities was conducted prior to drought implementation (pre-drought), six weeks after drought was induced (peak-drought), and one day after re-wetting (post-drought). There was little shift in nematode community structure or distribution along an <em>r-K</em> strategist continuum at peak-drought in the early successional land use. In the no-till land use, fungivore <em>r</em><em>-</em>strategist nematode abundances declined with drought stress, indicating overall less resistance to drought. Similar patterns persisted post-drought, whereby nematodes within the early successional land use remained unchanged, while nematodes within the no-till land use were slower to shift in response to alleviation. This study demonstrates that early successional land uses are valuable for fostering nematode communities that are resistant to drought. Moreover, drought stress impacts nematode community dynamics, which has implications for ecosystem functioning.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"210 ","pages":"Article 109919"},"PeriodicalIF":9.8,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144652167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Life strategies of nematodes determine energy patterns of food webs over 100 Years of primary succession in a salt marsh chronosequence","authors":"Jiyu Jia , Ron de Goede","doi":"10.1016/j.soilbio.2025.109921","DOIUrl":"10.1016/j.soilbio.2025.109921","url":null,"abstract":"<div><div>Understanding nematode community dynamics along succession gradients is critical for predicting ecosystem responses to environmental changes. However, studies on the dynamics of nematode communities and their associated food webs along chronosequences remain limited. We sampled soils along a well-established salt marsh chronosequence that spans more than a century of natural succession, and quantified nematode communities. The result showed that total nematode abundances exhibited a curved relationship with the stage of succession, peaking at intermediate stages. However, the abundance of different trophic and life strategy groups showed different responses to succession due to their specific responses to soil and plant properties. Bacterivores dominated in the early stage, while fungivores and herbivores dominated in the middle stage. Omnivores-carnivores only showed a significant increase in year-7, with no differences across other stages possibly due to high soil salinity suppressing top-down trophic regulation. K-strategist nematodes were more influenced by the stage of succession than r-strategist, correlating strongly with network stability, while r-strategists were more crucial for enhancing network complexity. Additionally, energy flow uniformity, rather than energy flux, in the nematode food webs was significantly correlated with the stage of succession. r-strategists contributed more to energy flux, whereas K-strategists were more essential for flow uniformity. These findings highlight the value of using nematodes as bioindicators to predict ecosystem stability and functions, emphasize the crucial role of nematode life strategists in shifting energy dynamics within nematode food webs during primary succession, and offer valuable guidance for the conservation and management of ecosystems undergoing natural succession.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"209 ","pages":"Article 109921"},"PeriodicalIF":9.8,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144645289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mika Lemoine , Stephan Hättenchwiler , Alexandru Milcu , Sandra Barantal , Johanne Nahmani , Pierre Ganault
{"title":"Persistent macrodetritivore functional diversity and identity effects on litter mass loss under drought in a Mediterranean forest understory model ecosystem","authors":"Mika Lemoine , Stephan Hättenchwiler , Alexandru Milcu , Sandra Barantal , Johanne Nahmani , Pierre Ganault","doi":"10.1016/j.soilbio.2025.109918","DOIUrl":"10.1016/j.soilbio.2025.109918","url":null,"abstract":"<div><div>Soil macrofauna's role in plant litter decomposition is increasingly recognized, with litterbag experiments in natural and lab settings highlighting its contribution in various pedoclimatic context. Recent findings indicate that macrofauna can counteract drought-induced slowing of decomposition and nutrient cycling, but the underlying mechanisms remain unclear. Characteristics of macrofauna communities, such as functional diversity (FD), community-weighted mean (CWM) traits, and species identity, may drive these effects and modulate decomposition responses to drought. In a controlled experiment simulating a Mediterranean forest understory, we tested how different macrodetritivore assemblages with increasing FD, based on five decomposition-related traits, affect decomposition under drought. We hypothesized that both FD and CWM of consumption rate would increase litter mass loss, with stronger effects under drought. Irrespective of species composition, results showed that higher FD significantly promoted litter mass loss, while consumption rate CWM had a small additional effect, supporting complementarity among species over the mass-ratio hypothesis. Species identity explained more variance than FD and CWM combined, highlighting the influence of specific species in the assemblages. Although drought reduced overall litter mass loss, the positive relationship between FD and mass loss persisted, suggesting that diverse macrodetritivore communities continue to promote decomposition and nutrient cycling under drought. This suggests that more functionally diverse macrodetritivore communities continue to promote litter decomposition and, consequently, nutrient cycling, even during periods of drought. These findings emphasize the importance of macrodetritivore communities in litter decomposition across climatic conditions and highlight the need to consider species identity in future biodiversity-ecosystem function studies.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"209 ","pages":"Article 109918"},"PeriodicalIF":9.8,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144640633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shane M. Franklin , Scott T. Retterer , Amber N. Bible , Jennifer L. Morrell-Falvey
{"title":"Controlling matric potential in microfluidics to examine microbial dynamics in unsaturated porous media","authors":"Shane M. Franklin , Scott T. Retterer , Amber N. Bible , Jennifer L. Morrell-Falvey","doi":"10.1016/j.soilbio.2025.109916","DOIUrl":"10.1016/j.soilbio.2025.109916","url":null,"abstract":"<div><div>The use of microfluidics for the study of soil microbial ecology is an emerging field. Most microfluidic studies of biological systems, however, have been performed under fully saturated conditions that are not representative of natural soil. Therefore, while microfluidics offer many unique capabilities that other methodologies cannot, they are not currently suited to address the effects of matric potential, an important variable defining the microbial moisture niche. Here, a methodology is presented that allows the user to control the aqueous conditions within microfluidic networks by manipulating matric potential using a hanging water column. The method relies on hydrophilic surface treatment of the microfluidic device using polyvinyl alcohol (PVA) and incorporating a bed of small pores at the network boundaries, which serve as a porous ceramic plate analogue (PPA). The method was validated on a simple capillary bundle and then on a more complex pore network. A water retention curve, exhibiting hysteresis, was generated for the pore network over a narrow matric potential range of 0 to – 5 kPa. Both the drainage and wetting curves were reproducible, as were the spatial configuration and the number of fragmented moisture niches in the pore network, particularly on the drainage curve. In contrast, the wetting curve exhibited greater variability in spatial configuration due to the “ink bottle effect,” where capillarity was interrupted by wider pore bodies. Ultimately, the methodology provides realistic pore-scale moisture conditions that can be easily manipulated and maintained, enabling new opportunities to explore soil biophysics and microbial biogeography in unsaturated porous media. As a brief example, images showing the localization of fluorescently tagged <em>Pantoea</em> sp. YR343 at −4.3 kPa are presented, highlighting bacterial distributions in water films and air-water interfaces.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"210 ","pages":"Article 109916"},"PeriodicalIF":9.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144629962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bartosz Adamczyk , Sylwia Adamczyk , Boris Tupek , Qian Li , Tijana Martinovic , Etienne Richy , Aleksi Lehtonen , Petr Baldrian , Raisa Mäkipää
{"title":"Nitrogen fertilisation of boreal forest soil increases soil carbon pool through elevated microbial necromass formation but also modifies tree secondary metabolism","authors":"Bartosz Adamczyk , Sylwia Adamczyk , Boris Tupek , Qian Li , Tijana Martinovic , Etienne Richy , Aleksi Lehtonen , Petr Baldrian , Raisa Mäkipää","doi":"10.1016/j.soilbio.2025.109917","DOIUrl":"10.1016/j.soilbio.2025.109917","url":null,"abstract":"<div><div>Forests contain significant amounts of the global carbon (C) pool with the major fraction stored belowground. Nitrogen (N) fertilisation of forest soils may increase biomass production and soil organic C pools, providing a strategy for climate change mitigation.</div><div>Here we aimed to elucidate the mechanisms behind the increase in soil C due to N addition using a long–term fertilisation experiment on a Scots pine stand with a combination of chemistry, microbiology and greenhouse gas fluxes.</div><div>Our results showed that N fertilisation increased C stocks, microbial biomass, necromass and the activity of extracellular enzymes, with no significant increase in greenhouse gas production. Moreover, N fertilisation decreased the production of a group of plant secondary metabolites, tannins. These profound changes were observed in the organic layer of the soil, and differences in mineral soil were less detectable.</div><div>Mechanistically, N fertilisation increased the C stock via elevated litter input and higher transfer of root C to soil microorganisms increasing fungal biomass and further necromass, which was stabilised in the soil. Our study supports the view that management strategies to increase microbial necromass in persistent C pools could lead to elevated C stabilization, though caution should be taken regarding potential changes in plant metabolism.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"209 ","pages":"Article 109917"},"PeriodicalIF":9.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144629960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Marty Kranabetter , Freya Innes , Charlotte E. Norris , Timothy J. Philpott , Terri Lacourse , Barbara J. Hawkins
{"title":"Diverging soil peroxidase activity under ectomycorrhizal versus arbuscular mycorrhizal conifers with increasing C:N and exchangeable manganese","authors":"J. Marty Kranabetter , Freya Innes , Charlotte E. Norris , Timothy J. Philpott , Terri Lacourse , Barbara J. Hawkins","doi":"10.1016/j.soilbio.2025.109913","DOIUrl":"10.1016/j.soilbio.2025.109913","url":null,"abstract":"<div><div>Ectomycorrhizal (EM) fungi purportedly contribute to the enzymatic decay of soil organic matter (SOM), in contrast to arbuscular mycorrhizal (AM) stands where SOM turnover may be more fully governed by free-living saprotrophic fungi. We tested this distinction in a 30-year-old mixedwood conifer trial by comparing total peroxidase activity (including manganese-peroxidase [MnP]), fungal communities and mass of the humus layer between <em>Pseudotsuga menziesii</em> (EM host), <em>Thuja plicata</em> (AM host), and a 50:50 mixture across a natural productivity gradient. Total peroxidase and MnP activity diverged between hosts as humus C:N ratio increased, culminating in 3- to 4-fold greater enzyme activity under <em>P. menziesii</em> on low fertility soils. This soil effect also correlated positively with exchangeable Mn, highlighting a possible further restriction on SOM turnover under EM stands. Peroxidase activity was well aligned with a subset of abundant EM fungal species, notably <em>Piloderma olivaceum</em> and <em>Piloderma sphaerosporum</em>, suggesting a much greater enzymatic contribution by these symbiotic fungi in comparison to saprotrophic fungi under <em>T. plicata</em>. After three decades, mass of the humus layer averaged 2.15 kg OM m<sup>−2</sup> and did not yet differ among stand types. However, a 3-fold range in humus mass in correlation with declining soil fertility under <em>P</em>. <em>menziesii</em> suggests that select EM fungal taxa engaged in organic N liberation can limit SOM accumulation. This research highlights the adaptive ligninolytic enzymatic capacity of EM fungal communities and underscores how dual soil properties (low N or high Mn availability) may enhance peroxidase production and SOM turnover in EM forests.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"209 ","pages":"Article 109913"},"PeriodicalIF":9.8,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Huijie Zheng , Ye Li , Deyan Liu , Junji Yuan , Zengming Chen , Junjie Li , Weixin Ding
{"title":"Wetland restoration following agricultural abandonment supports diversity and reduces stochasticity in soil fungal communities due to anaerobic-induced interspecific associations","authors":"Huijie Zheng , Ye Li , Deyan Liu , Junji Yuan , Zengming Chen , Junjie Li , Weixin Ding","doi":"10.1016/j.soilbio.2025.109909","DOIUrl":"10.1016/j.soilbio.2025.109909","url":null,"abstract":"<div><div>Soil fungi play a pivotal role in regulating various functions within terrestrial ecosystems. Understanding the progression of soil fungal communities during wetland restoration following agricultural abandonment is essential for assessing the sustainability of rehabilitated ecosystems. Soils along a chronosequence of paddy fields and wetlands restored for 1, 3, and 4 years were studied to investigate the dynamics of fungal diversity and assembly processes, focusing on how these changes relate to species associations and soil environmental factors, particularly redox condition and carbon (C) supply, which predominantly regulate a range of ecological services. Wetland restoration increased both soil fungal taxonomic and phylogenetic diversity. The relative contribution of nestedness increased with restoration duration, emphasising the importance of richness increases in soil fungal community succession during wetland restoration. Concurrently, stochastic assembly processes of soil fungal communities decreased with restoration duration, as indicated by a decline in the phylogenetic normalised stochasticity ratio. However, soil fungal community assembly was decoupled from anaerobic condition (indicated by ferrous iron/ferric iron ratio) and labile C supply (indicated by organic C content and the relative abundance of the di-O-alkyl C functional group). In contrast, the decrease in stochasticity was associated with enhanced species associations, reflected by increases in node number, edge number, and average degree, particularly positive associations, as shown by the rise in the positive-to-negative edge ratio during wetland restoration. This pattern might be because that despite stronger soil anaerobic condition, enriched anaerobic species (e.g., Mortierellales) could provide nutrients to aerobic species (e.g., Helotiales) through positive associations, thereby broadening fungal niche breadth. This, in turn, might cascade into more diversified and less stochastic fungal communities during wetland restoration. Overall, our results suggest that anaerobic-induced interspecific associations reduce stochasticity in soil fungal communities and provide a mechanistic perspective on the protection of soil fungal diversity during wetland restoration following agricultural abandonment.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"209 ","pages":"Article 109909"},"PeriodicalIF":9.8,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144612976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}