Geoderma最新文献

{"title":"Experimental study of rainfall and inflow characteristics effects on gully head erosion on the Loess Plateau","authors":"Chengcheng Jiang ,&nbsp;Zhao Jin ,&nbsp;Wen Fan ,&nbsp;Ningyu Yu ,&nbsp;Enlong Liu","doi":"10.1016/j.geoderma.2026.117682","DOIUrl":"10.1016/j.geoderma.2026.117682","url":null,"abstract":"<div><div>Gully head erosion is considered a major form of soil degradation on the Loess Plateau, where distinctive topographic conditions promote runoff convergence during rainfall events and consequently intensify gully head retreat. However, systematic monitoring approaches and mitigation mechanisms under the combined effects of rainfall and inflow remain insufficiently understood. The objectives of this study are to reveal the synergistic mechanisms of rainfall and inflow driving gully head erosion through field experiments, and to establish hydrodynamic critical thresholds governing gully head erosion, thereby providing new insights for predicting erosion at the gully head by integrating topographic and hydraulic conditions. Through systematic field experiments, it was revealed that soil loss increased proportionally with both the rainfall intensity and the inflow rate. Moreover, catchment characteristics are the dominant factors influencing erosion dynamics at gully heads, with inflow playing a more significant role than rainfall in triggering gully wall expansion and collapse. Specifically, stream power is the optimal hydrodynamic parameter for predicting erosion rates, with a critical threshold of 2.33 N m⁻¹ s⁻¹ to distinguish stable and erosive conditions. Based on these findings, a dimensionless model was developed to predict gully head erosion under combined rainfall and inflow conditions, integrating both topographic and hydraulic parameters, and the model achieved high predictive accuracy (<span><math><mrow><msup><mrow><mi>R</mi></mrow><mn>2</mn></msup><mo>=</mo><mn>0.843</mn></mrow></math></span>, <span><math><mrow><msub><mi>N</mi><mrow><mi>SE</mi></mrow></msub><mo>=</mo><mn>0.788</mn></mrow></math></span>) for erosion initiation of gully head under complex rainfall-inflow interactions. This study establishes a simple and effective method for predicting erosion initiation and progression. These advances provide not only a mechanistic understanding of erosion drivers but also valuable scientific insights for rational engineering and management of the Loess Plateau.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117682"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146001486","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":"Mechanisms of generation and accumulation of geogenic Cr(VI) in serpentinite-weathered soils","authors":"Rouyun Zhou ,&nbsp;Bolang Luo ,&nbsp;Ming Ao ,&nbsp;Taicong Liu ,&nbsp;Ruichun Meng ,&nbsp;Loua-Augustin Bonaventure ,&nbsp;Xiaoli Qian ,&nbsp;Jean-Louis Morel ,&nbsp;Pan Wu ,&nbsp;Shizhong Wang ,&nbsp;Rongliang Qiu","doi":"10.1016/j.geoderma.2026.117675","DOIUrl":"10.1016/j.geoderma.2026.117675","url":null,"abstract":"<div><div>Natural oxidation of geogenic Cr(III) to carcinogenic Cr(VI) is a major source of Cr contamination in soil and water. However, the mechanisms of Cr(VI) generation and occurrence under anoxic conditions remain unclear. Although Mn(III/IV) oxides are considered key oxidants, their interactions with stable Cr(III) minerals and the subsequent fate of Cr(VI) represent critical knowledge gaps. This study combines field profile analysis of serpentinite weathering in southwest China with laboratory experiments to clarify these processes. We introduce a new mechanism termed “in situ oxidation-surface adsorption” mechanism: the stability of secondary Cr(III) minerals governs oxidation sensitivity, Mn(III/IV) oxides drive Cr(VI) generation via direct surface contact, while Fe(III)/Mn(III/IV) oxides act as effective adsorbents retaining Cr(VI) in the solid-phase. Experimental results indicate that sub-stable Cr(OH)₃ formed during serpentinite weathering is the primary contributor to Cr(VI) generation, while Cr₂O₃ is negligible. In conditions with low reductants, more than 99.8% of the Cr(VI) generated is adsorbed onto the surfaces of Fe(III)/Mn(III/IV) oxides, creating a stable “Cr(VI) reservoir” with limited release into the aqueous phase. These findings challenge conventional dissolution-migration-oxidation models and enhance our understanding of Cr(VI) generation and accumulation in anoxic soils, providing crucial insights for assessing and managing geological Cr risks.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117675"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956995","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":"Climate-dependent variations in plant and nematode functional traits following shrub encroachment","authors":"Anning Zhang ,&nbsp;Ziyang Liu ,&nbsp;Jingwei Chen ,&nbsp;Hongxian Song ,&nbsp;Jiajia Wang ,&nbsp;Hanwen Cui ,&nbsp;Zi Yang ,&nbsp;Shuyan Chen ,&nbsp;Lizhe An ,&nbsp;Sa Xiao ,&nbsp;Pedro Cardoso","doi":"10.1016/j.geoderma.2026.117694","DOIUrl":"10.1016/j.geoderma.2026.117694","url":null,"abstract":"<div><div>Current climate change and anthropogenic activities are causing shrub encroachment, affecting biodiversity and ecosystem functioning. Shrub and their associated herbaceous plants and soil organisms will asynchronously colonize the new range, shaping different above and belowground relationships along climate gradients. With this work we quantify the functional linkage of plant and nematode communities in functional diversity and traits between shrubs and open spaces at 63 sites spanning broad climatic gradients on the Qinghai-Tibet Plateau. Shrub and climate interaction reshuffles herbaceous plant and nematode diversity and their function. Shrubs increased nematode taxonomic and functional diversity with increasing precipitation and temperature, but such shrub effects on plant diversity were independent of the climatic gradient. Shrub, precipitation, and temperature jointly modulate nematode traits, but have little effects on herbaceous plant traits. Shrubs increased nematodes with longer generation time, larger body mass, and at higher trophic levels, enhancing the metabolic footprint of soil communities; stronger modification on soil food webs and enrichment footprints amplified with increasing precipitation and temperature. Shifts in plant traits were associated with nematode C-P value and trophic structure, while Shrubs reduced the linkage between plants and nematodes in functional traits. Our study demonstrates that climate modulates the facilitative shrub effects on biodiversity and its functions, but points to the functional decoupling of plants and nematodes to environment shifts that may delay nutrient cycle and impact ecosystem functioning.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117694"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033235","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":"Corrigendum to “Optimization of soil hydraulic parameters within a constrained sampling space” [Geoderma 455 (2025) 117210]","authors":"Meijun Li ,&nbsp;Wei Shao ,&nbsp;Wenjun Yu ,&nbsp;Ye Su ,&nbsp;Qinghai Song ,&nbsp;Yiping Zhang ,&nbsp;Hongkai Gao ,&nbsp;Yonggen Zhang ,&nbsp;Jianzhi Dong","doi":"10.1016/j.geoderma.2026.117701","DOIUrl":"10.1016/j.geoderma.2026.117701","url":null,"abstract":"","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117701"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072097","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":"Interactions between soil environmental factors and microbial communities consistently predict plant health","authors":"Hao Su ,&nbsp;Yuanyuan Yan ,&nbsp;Qiqi He ,&nbsp;Ya Li ,&nbsp;Ruimin Li ,&nbsp;Yi Ren ,&nbsp;Xing Zhou ,&nbsp;Liangliang Liu ,&nbsp;Zucong Cai ,&nbsp;Xinqi Huang","doi":"10.1016/j.geoderma.2026.117709","DOIUrl":"10.1016/j.geoderma.2026.117709","url":null,"abstract":"<div><div>Intensive agricultural practices cause dysbiosis in soil nutrient levels and microbial communities, significantly affecting plant health and productivity. However, the mechanisms underlying the interactions between soil environmental factors and microbial communities, and their role in determining and predicting plant health, remain poorly understood. In this study, we collected soils planted with tomato in different health conditions, including healthy and bacterial wilt, <em>Fusarium</em> wilt, and nematode diseases, to identify key abiotic and biotic factors influencing plant health. Additionally, We fitted machine learning models using multidimensional data to classify plant health status. Our results revealed that diseased soils (bacterial wilt, <em>Fusarium</em> wilt, and nematode disease) exhibited significantly higher AP levels compared to healthy soils. Moreover, increased Amplicon Sequence Variants (ASVs) in diseased soils had lower network connectivity and were positively correlated with soil nutrient contents, pathogen abundance, and pathogen-supportive soil microbial functions, while being negatively correlated with plant defense-associated soil microbial functions. Both soil nutrient levels and the increased ASVs in diseased soil were stronger correlates of disease occurrence than other soil indicators. Optimal classification performance was observed when both soil environmental factors and microbial communities were considered, with AP emerging as the most influential indicator. In conclusion, excessive accumulation of AP was associated with disrupted microbial community structures, destabilized microbial networks, enhanced pathogen abundance, and impaired microbial functions, which collectively correlated with higher disease occurrence. These findings highlight the potential importance of optimizing soil nutrient management for supporting plant health.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117709"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134164","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":"Temporal and Vertical Variability of Post-Tillage Topsoil Hydraulic Properties at a Local Scale","authors":"Jan-František Kubát,&nbsp;Michal Vrána,&nbsp;Adam Babuljak,&nbsp;David Zumr","doi":"10.1016/j.geoderma.2026.117683","DOIUrl":"10.1016/j.geoderma.2026.117683","url":null,"abstract":"<div><div>Soils exhibit considerable variability in their physical and hydraulic properties, which can change both spatially and temporally. However, studies capturing short-term temporal and internal vertical variability within tilled topsoil remain limited. In this one-year study (May 2023–2024), we investigated seasonal changes in the physical and hydraulic properties of the bare topsoil after tillage in a humid continental climate in Czechia. Monthly sampling was conducted on a 16 m² plot, targeting the upper 12 cm of soil, divided into 0 to 5 cm and 7 to 12 cm layers. A total of 28 disturbed and 107 undisturbed samples were collected, and 40 soil water retention curves (SWRCs) were measured and fitted with the van Genuchten–Mualem model to derive hydraulic parameters (<em>α, n, θ_r, θ_s, K_s</em>). Robust statistical analyses (permutation tests, Kruskal–Wallis, Dunn’s test, LOWESS, and MANOVA) were used to evaluate vertical and temporal variability. The results revealed significant changes in the hydraulic properties of the fitted devices. The depth explained approximately half of the total multivariate variance (η² ≈ 0.5), while time accounted for roughly one-third (η² ≈ 0.3–0.4). The upper layer exhibited greater heterogeneity in the <em>n</em> parameter (1.404 ± 0.126) compared to the deeper layer (1.254 ± 0.103), while <em>α</em> showed comparable variability (0.060 ± 0.019 vs. 0.075 ± 0.024). These moderate-to-large effect sizes indicate that, even within the first 12 cm, hydraulic behavior is neither uniform nor static. The contrasting patterns between the fitted full SWRCs and their derived parameters highlight the importance of evaluating both datasets jointly. Relying solely on parameter statistics or individual retention curve risks overlooking meaningful temporal and vertical dynamics. Our findings demonstrate that post-tillage topsoil evolves structurally and hydraulically even in the absence of vegetation or management, emphasizing the need for depth- and time-resolved parameterization in hydrological and soil-process modeling.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117683"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975323","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":"Dissolved organic matter and high precipitation drive in-situ transition from silandic to aluandic properties","authors":"Antonia Zieger ,&nbsp;Klaus Kaiser ,&nbsp;Martin Kaupenjohann","doi":"10.1016/j.geoderma.2026.117689","DOIUrl":"10.1016/j.geoderma.2026.117689","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Andosols are commonly subdivided according to silandic and aluandic features. Silandic Andosols are characterised by organic matter (OM) strongly bound to short-range ordered aluminosilicates (SROAS), while aluandic Andosols mainly consist of aluminium-OM complexes (Al-OM complexes). Two theories exist concerning their pedogenesis. One theory argues, that silandic and aluandic properties are direct results of the weathering, assuming two separate lines of genesis. The other theory argues that silandic horizons transform into aluandic over time as parts of a continuous soil forming process. The latter could be caused by dissolved organic matter (DOM) entering the silandic subsoil with the percolating soil solution and promoting the dissolution of SROAS phases by complexing Al. Increasing the loading of DOM with Al will finally result in the formation of insoluble Al-OM complexes.&lt;/div&gt;&lt;div&gt;To test the hypothesis of in-situ transition from silandic to aluandic properties in a controlled experiment, we conducted a 20-month percolation experiment with soil material of an Ecuadorian Andosol formed in a homogeneous tephra deposit and now featuring aluandic properties in the top- and silandic properties in the subsoil. Six columns were packed with aluandic material on top of silandic material, water saturated and percolated with litter DOM-solution continuously (percolation rate 8&lt;!--&gt; &lt;!--&gt;mm&lt;span&gt;&lt;math&gt;&lt;mi&gt;⋅&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;h&lt;sup&gt;−1&lt;/sup&gt;, except for a 9-week flow stop at the beginning of the experiment). In addition, three columns were packed only with aluandic material to gain additional information on the solution entering the silandic material. Among others, silicon (Si) and Al, pH, and dissolved organic carbon (DOC) in the feed and eluate solutions were monitored over a period of 20 months. We modelled the percolation experiment with the convection–dispersion equation as implemented in HYDRUS-1D to estimate the amount of retained DOC in the silandic material. Changes in OC concentration and mineral phases were tracked by analysing the column materials after 0, 8, and 20 months for OC concentrations, oxalate-extractable Al, Si, and iron (Fe) concentrations, and by X-ray diffraction.&lt;/div&gt;&lt;div&gt;Our results show that percolation had little to no effect on the aluandic material. However, for the silandic eluate the molar Al:Si ratio was well below the oxalate-extractable Alox:Siox molar ratio of the silandic material itself. This hints at desilification, while Al and OC are retained relative to Si and hence supporting the hypothesis of SROAS dissolution and neo-formation of Al-OM complexes. The latter explained up to 70&lt;!--&gt; &lt;!--&gt;% of the massive OC accumulation of 14&lt;!--&gt; &lt;!--&gt;mg&lt;span&gt;&lt;math&gt;&lt;mi&gt;⋅&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;g&lt;sup&gt;−1&lt;/sup&gt; in the silandic material, while vertical Al-OM transport and sorption played a minor role. This was supported by the HYDRUS-1D modelling, suggesting that sorption of DOM to the silandic material only dominates in ","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117689"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072101","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":"How strongly do management practices and scales influence soil erosion rates in olive orchards? Empirical evidence from Alentejo (Portugal)","authors":"V. Daimonakos ,&nbsp;A.Van Zinderen ,&nbsp;J. Muñoz-Rojas ,&nbsp;D. Costa ,&nbsp;J.P. Nunes ,&nbsp;S.A. Prats","doi":"10.1016/j.geoderma.2026.117673","DOIUrl":"10.1016/j.geoderma.2026.117673","url":null,"abstract":"<div><div>The use of vegetation suppression, such as herbicide application and mechanical plowing in olive orchards can exacerbate soil erosion. Maintaining understory vegetation can mitigate erosion and enhance soil fertility. Although prior research has assessed the soil management impact on erosion, knowledge gaps persist regarding dominant erosion processes across spatial scales and management effects on soil microenvironments (tree canopy, wheel ruts, vegetation strips). This study systematically evaluates how soil management (herbicides, plowing, no intervention) and spatial scales (microplots, hillslope plots) affect erosion dynamics, soil properties and their interactions with rainfall, ground cover, and orchard characteristics in Alentejo, Portugal. Over two years, seven orchards with varying management practices were monitored for erosion rates, ground cover, and soil properties. Soil management strongly influenced erosion, with herbicides inducing the highest hillslope-scale erosion (average 11.3 t ha⁻¹ yr⁻¹) and plowing dominating microplot erosion, while untreated plots exhibited minimal erosion (up to 99 % lower than the herbicide treatments). Wheel rut areas increased hillslope erosion through runoff concentration and bare soil, while vegetation strips suppressed it completely. Tree canopy areas varied: plowing mobilized new sediments, whereas untreated/herbicide microplots showed no erosion due to vegetation cover or stone‑lag armoring. Hillslope erosion stemmed from cumulative runoff, while microplots were influenced by soil properties like roughness or bulk density. Our findings highlight the need to consider scale effects in erosion modelling and policy. Future research should explore longer-term trends, expand underlying conditions (e.g. soil types, climatic zones or management practices), and refine soil erosion models to support sustainable soil conservation.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117673"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145915418","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":"Comparative adsorption mechanism and transport behaviors of 2,4-D and 4-CPA in soil column with addition of Mg-Al layered double hydroxides","authors":"Sitong Pan ,&nbsp;Wenqing Wang ,&nbsp;Miaoyue Zhang ,&nbsp;Ying Li ,&nbsp;Ning Wang ,&nbsp;Jingna Liu ,&nbsp;Xiaoqian Jiang","doi":"10.1016/j.geoderma.2026.117691","DOIUrl":"10.1016/j.geoderma.2026.117691","url":null,"abstract":"<div><div>2,4-Dichlorophenoxyacetic acid (2,4-D) and 4-chlorophenoxyacetic acid (4-CPA) exhibit high water solubility and mobility, leading to low utilization efficiency and environmental contamination. Research into controlling the migration and leaching of multiple pesticides in complex soil environments remains relatively limited. This study employed Mg-Al layered double hydroxides (LDHs) to control the loss of 2,4-D and 4-CPA simultaneously. Here, adsorption kinetics experiments, density functional theory (DFT) calculations, column experiments and numerical models were conducted to investigate the adsorption mechanisms of the two herbicides onto LDHs, the co-/transport and co-/release behaviors of the herbicides in soil with the addition of LDHs. Outer-sphere complexation was the predominant adsorption mechanism for 4-CPA with LDHs, while outer-sphere and inner-sphere complexation occurred between 2,4-D and LDHs. DFT calculations indicated lower adsorption energy and greater adsorption strength between LDHs and 2,4-D compared to that between LDHs and 4-CPA. The retention of two herbicides in the soil increased by 8.99–22.46 % with 0.5 wt% LDHs and increased with the decrease of pH values and ionic strength (IS) of soil solution. The release amounts of 4-CPA and 2,4-D from LDHs in soil columns increased by 9.06 % and 12.05 % when the IS of K⁺ decreased from 100 to 0 mM, and increased by 11.12 % and 15.49 % in the presence of 25 mM carbonate. LDHs exerted a greater loss control effect on the simultaneous application of both herbicides. Either 2,4-D or 4-CPA would lead to the release of each other with the addition of LDHs. Pot experiment results further verified that the addition of LDHs in soil could reduce the loss of the herbicides by up to 77.29 %, which brought greater germination control of <em>Abutilon theophrasti</em>. This study provides novel mechanistic insights into the differential adsorption and transport of coexisting herbicides controlled by LDH_S under complex environmental conditions, offering promising strategies for enhancing herbicide efficacy and mitigating environmental risks in sustainable agriculture.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117691"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014530","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":"Dissolved organic matter dynamics and chemistry under fungal activity: A microcosm incubation with litter differentially 13C-labelled","authors":"Thanh Thuy Nguyen Tu ,&nbsp;Marion Texier ,&nbsp;Rania Krimou ,&nbsp;Philippe Biron ,&nbsp;Sylvie Collin ,&nbsp;Emmanuel Aubry ,&nbsp;Mercedes Mendez-Millan ,&nbsp;Christelle Anquetil ,&nbsp;Caroline Kunz ,&nbsp;Frédéric Delarue ,&nbsp;Marie A. Alexis ,&nbsp;Joëlle Dupont","doi":"10.1016/j.geoderma.2025.117670","DOIUrl":"10.1016/j.geoderma.2025.117670","url":null,"abstract":"<div><div>This work aimed at better documenting the effects of fungal activity on dissolved organic matter (OM) in soils. Dynamics of water-extractable OM (as surrogate for dissolved OM) quantity and chemical quality was monitored during a ca. 6 month microcosm incubation of plant residues in the presence of fungi. Differential ¹³C-labelling of metabolites vs structural compounds of the incubated residues further allowed clarifying the balance between fungal mineralisation and production of soluble compounds (through biosynthesis and/or decomposition). The fungus <em>Trichoderma harzianum</em> was mainly active during the first weeks of incubation, substantially mineralizing WEOM, preferentially consuming carbohydrates. The fungus induced chemical modification of WEOM, notably selective preservation of lipids and oxidation of lignin moieties. While <em>T. harzianum</em> probably degraded some insoluble structural molecules and produced biomass, these contributions to bulk WEOM appeared minor (when compared with leaching and mineralization), either because non-significant or entering non-extractable carbon pool. Additionally, characterization of control fungus-free microcosms, highlighted the potential role of abiotic processes on WEOM production, including leaching and depolymerisation by extracellular enzymes, notably of carbohydrate rich (insoluble) macromolecules.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"466 ","pages":"Article 117670"},"PeriodicalIF":6.6,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014535","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}