Geoderma最新文献

{"title":"Depth-dependent patterns of soil organic carbon fractions in Sphagnum and herbaceous wetlands","authors":"Wen Tian,&nbsp;Changchun Song,&nbsp;Jiantao Xue,&nbsp;Hao Zhang,&nbsp;Yanyu Song,&nbsp;Wenwen Tan,&nbsp;Xing Xiang,&nbsp;Han Liu,&nbsp;Huan Yang","doi":"10.1016/j.geoderma.2026.118069","DOIUrl":"10.1016/j.geoderma.2026.118069","url":null,"abstract":"<div><div>Wetlands are global hotspots for soil organic carbon (SOC) storage, comprising particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) fractions. However, these two SOC fractions are not typically considered along soil depth when assessing SOC persistence in wetland systems. Here, based on soil sampling at two depths (surface: 0–10 cm; subsurface: 20–30 cm) across three representative wetlands spanning subtropical, mid-temperate, and cold temperate regions, including <em>Sphagnum</em>- and herbaceous-dominated wetland systems, the distribution of SOC fractions was delineated, alongside soil properties and microbial characteristics. Results showed that <em>Sphagnum</em> wetlands stored more SOC in the POC fraction, with a higher surface soil POC/MAOC ratio relative to subsurface soils. By contrast, SOC in herbaceous wetlands was dominated by MAOC, with a lower surface soil POC/MAOC ratio than in subsurface soils. The POC/MAOC ratio was positively correlated with the ratio of particulate nitrogen to mineral-associated nitrogen in both two horizons. C/N imbalance destabilized surface SOC, whereas microbial diversity and abundance promoted subsurface SOC stabilization. Bacterial and fungal carbon pump efficacies emerged as dominant controls on POC/MAOC ratios in surface and subsurface soils, respectively. Collectively, these findings illuminated divergences of SOC functionality and potential persistence between surface and subsurface soils in <em>Sphagnum</em>- and herbaceous-dominated wetlands, with implications for SOC dynamics under anthropogenic perturbations and climatic stress.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118069"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149085379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Non-linear soil health trajectories in smectitic Vertisols: Coupling sedimentary inheritance to long-term intensive cultivation in Am-Timan, Southeastern Chad","authors":"Wavel Mouaromba,&nbsp;Abdramane Abgassi Adoum,&nbsp;Elie Fosso Menkem,&nbsp;Bahouro Arka,&nbsp;Rolf Gael Mabicka Obame,&nbsp;Neil-Yohan Musadji,&nbsp;Simon Djakba Basga,&nbsp;Thomas Z. Lerch,&nbsp;Gilbert François Ngon Ngon","doi":"10.1016/j.geoderma.2026.118062","DOIUrl":"10.1016/j.geoderma.2026.118062","url":null,"abstract":"<div><div>Long-term cultivation can substantially reorganize soil physicochemical functioning in semi-arid agroecosystems, particularly in smectitic Vertisols developed from fine-grained alluvial deposits. This study assessed depth-dependent soil quality trajectories and the influence of sedimentary inheritance along a cultivation chronosequence in Southeastern Chad, comprising an uncultivated reference and fields cultivated for approximately 25, 35, and 50 years under continuous flood-recession sorghum production with glyphosate-based weed management. Soil samples were collected at 0–20, 20–40, and 40–60 cm depths and analysed for bulk density, electrical conductivity, particle-size distribution, soil organic matter and total nitrogen, available phosphorus, exchangeable base cations, cation exchange capacity, and derived soil quality indicators. Multivariate analyses, including principal component analysis and hierarchical clustering, revealed non-linear, vertically structured soil quality trajectories rather than a monotonic degradation gradient. The 25-year stage represented an early adjustment phase, characterized by profile-wide compaction, elevated pH, and incomplete structural recovery. The intermediate 35-year stage appeared to correspond to a transient phase exhibiting the strongest coupling between soil structure, base saturation, nutrient redistribution, and organic matter–nitrogen dynamics throughout the profile. In contrast, the 50 years stage showed evidence of long-term alteration, with weaker structure–fertility interactions, progressive, base-cation depletion, potassium limitation, and emerging subsoil constraints despite persistently high inherent cation exchange capacity inherited from the smectitic parent material. These results suggest that soil health in smectitic Vertisol is governed not by clay content or exchange capacity alone, but by the maintenance of effective exchange-site occupancy, aggregation, and nutrient cycling throughout the soil profile<strong>.</strong> Overall, the findings indicate that long-term cultivation reorganizes rather than overrides the inherited sedimentary template, resulting in non-linear and depth-dependent soil quality trajectories. From a management perspective, sustaining these systems requires residue retention, organic inputs, replenishment of base-cations and potassium, controlled traffic on wet clay soils, and regular monitoring of subsoil properties to preserve both surface and subsurface functioning in Sudano–Sahelian agroecosystems.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118062"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149085477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Iron-bound organic carbon responses to land-use change vary with soil carbon availability and Fe-pool composition","authors":"Yanping Wu,&nbsp;Jinying Xu,&nbsp;Zhengjun Jian,&nbsp;Hailin You,&nbsp;Zheren Yan,&nbsp;Jiafei Ye,&nbsp;Wenjing Yang,&nbsp;Yong Ge,&nbsp;Bo Yao,&nbsp;Qiwu Hu","doi":"10.1016/j.geoderma.2026.118031","DOIUrl":"10.1016/j.geoderma.2026.118031","url":null,"abstract":"<div><div>Iron-bound organic carbon (Fe-OC) contributes to soil organic carbon (SOC) persistence, but its broad-scale response to land-use change (LUC) remains unclear. We synthesized paired-site observations from 75 publications worldwide. Degradation and restoration were analyzed separately relative to their respective paired reference sites. Degraded soils contained less SOC, Fe-OC, clay, total nitrogen, and total Fe, but had higher topsoil bulk density and pH. They also showed smaller relative contributions of short-range-order and organically complexed Fe forms. Restored soils contained more SOC, Fe-OC, clay, nutrients, and total Fe and showed greater relative contributions of these Fe forms, but had lower pH. However, Fe-OC accounted for a smaller share of SOC in restored soils, while organic carbon loading relative to extractable Fe was higher. Predictor support differed between LUC categories: SOC, pH, and microbial biomass carbon (MBC) received the strongest statistical support under degradation, whereas SOC, C/N, and the Feo/Fed ratio received the strongest support under restoration. Overall, these independent contrasts indicate that Fe-OC responses vary with soil carbon availability and Fe-pool composition. Higher bulk SOC in restoration comparisons therefore does not necessarily indicate a proportionally greater contribution of Fe-associated carbon.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118031"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149085478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Contrasting roles of inherent soil characteristics, climate, and management for soil property states and changes – Long-term observations from arable soil monitoring sites in Switzerland","authors":"Fabien Durand-Maniclas,&nbsp;Olivier Heller,&nbsp;Michael Müller,&nbsp;Ramon Zimmermann,&nbsp;Daniel Suter,&nbsp;Florian Walder,&nbsp;Juliane Hirte","doi":"10.1016/j.geoderma.2026.118066","DOIUrl":"10.1016/j.geoderma.2026.118066","url":null,"abstract":"<div><div>Soil properties such as soil organic carbon (SOC), nitrogen (TN), phosphorus (PTP), and bulk density (BD) underpin soil fertility and ecosystem functioning, yet the relative importance of factors controlling their long-term states and short-term changes remains poorly quantified. Here, we analyse 35 years of data from 26 arable soil monitoring sites in Switzerland to (i) quantify temporal trends in soil properties across crop rotation types and sites; (ii) identify management, soil, and climate predictors of soil property states and annual changes; and (iii) assess the contexts in which different modelling frameworks provide suitable insights into soil dynamics. We combined indicator-based management and pedoclimatic data and applied linear mixed-effects and nonlinear modelling approaches. Across sites, SOC, TN, and PTP show no consistent trends, while BD decreases slightly over time. Soil texture and pH explain most of the variation in soil property states, whereas climate and management play a stronger role in explaining their changes. As a key management indicator, soil cover days are positively related to SOC and TN states and changes. Linear models provide robust rankings of dominant predictors, while nonlinear models identify context-dependent thresholds and climatic constraints on management responses. Soil organic carbon and TN show meaningful responsiveness to management over time periods of several years, whereas PTP remains constrained by soil buffering, and BD varies primarily with climatic conditions. Overall, soil management and policy should prioritize the continuity of protective measures and site-adapted management that reduces soil degradation risks and aligns practices with local soil and climate conditions.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118066"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149085380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The conversion of HCO3– in irrigation water into soil inorganic C under winter wheat and summer millet cultivation in a semiarid cropland","authors":"Zhenyu Zhao,&nbsp;Yingwen Zan,&nbsp;Zimu Li,&nbsp;Yuan Huang,&nbsp;Yang Gao,&nbsp;Yongxin Ni,&nbsp;Jiabin Liu","doi":"10.1016/j.geoderma.2026.118065","DOIUrl":"10.1016/j.geoderma.2026.118065","url":null,"abstract":"<div><div>Irrigation water in arid and semi-arid croplands often contains high concentrations of bicarbonate, which may react with soil available cations under alkaline conditions to form pedogenic inorganic carbon, thereby promoting soil inorganic carbon (SIC) accumulation. However, direct evidence and quantitative assessment of the contribution of HCO₃^– in irrigation water into SIC formation remain limited. In this study, a one-year pot experiment was conducted under winter wheat and summer millet cultivation in a temperate region. Crops were irrigated with H¹³CO₃^- labeled water, and the conversion rate of HCO₃^– in irrigation water into SIC was quantified and the underlying mechanisms were analyzed. The results showed that δ¹³C-SIC values significantly increased in all soil layers (0–80) after H¹³CO₃^- irrigation, directly confirming that HCO₃^– in irrigation water can be converted into SIC and retained in soil at a short-term. The conversion rates of HCO₃^– into SIC were 27.98% and 12.44% during the winter wheat and summer millet growing periods, respectively, with an annual average conversion rate of 20.21%, indicating clear seasonal differences in the conversion of HCO₃^– in irrigation water into SIC. The ¹³C stored in SIC decreased with soil depth, was positively correlated with soil water content, and exhibited a quadratic relationship with soil temperature. These results demonstrated that irrigation bicarbonate can contribute to short-term incorporation of carbon into SIC pools, with potential implications for longer-term carbonate formation, and highlighted the important role of hydrothermal conditions in regulating SIC formation.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118065"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149085348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of novel stover valorization pathways on soil organic matter dynamics in a highly weathered soil","authors":"E. Sonntag,&nbsp;A. Parodi,&nbsp;G. Rahmann,&nbsp;J.W. van Groenigen,&nbsp;A. Vidal","doi":"10.1016/j.geoderma.2026.118068","DOIUrl":"10.1016/j.geoderma.2026.118068","url":null,"abstract":"<div><div>Soil organic matter (SOM) is vital for soil health and productivity in the highly weathered soils of Sub-Saharan Africa, where crop residue management is crucial for replenishing SOM. Novel circular stover valorization pathways for stover, including oyster mushroom cultivation and vermiculture, can enhance food security while returning organic amendments to soil. However, from an equivalent amount of maize stover, these pathways generate amendments varying in carbon quantity and quality due to differing conversion efficiencies and losses, and their effects on soil carbon relative to conventional stover management remain unclear. We evaluated five maize stover-derived amendments in a 51-day incubation of a highly weathered soil: stover, burned stover, spent mushroom substrate (SMS), vermicomposted stover (VCstover), and vermicomposted SMS (VCSMS), applied at rates reflecting each pathway’s biophysical potential. Novel pathways produced amendments with roughly one-third to one-half the carbon content of stover and lower C/N ratios (43–63 vs. 94). All amendments except burned stover significantly increased heterotrophic respiration. Despite contrasting carbon inputs, bulk soil carbon after 51 days remained unchanged across all novel amendments relative to the control. However, vermicomposted amendments (VCSMS and VCstover) shifted SOM partitioning toward particulate (POM) and away from mineral-associated organic matter (MAOM), with POM rising from 43 % to 51–53 %. This suggests that the vermicomposting pathway could influence early SOM formation, reflecting the combined effects of amendment processing and lower C inputs rather than either alone. Although observed over 51 days, this effect could carry longer-term implications for carbon persistence given MAOM’s greater stability. In the short-term, novel stover valorization pathways show potential to maintain soil carbon while supporting food security.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118068"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149085378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response of long-term strength and microstructural parameters of frozen loess, kaolin, and bentonite to freeze–thaw cycles","authors":"Chunguang Xu,&nbsp;Ze Zhang,&nbsp;Yaqian Dong,&nbsp;Qi Liu,&nbsp;Yeping Li,&nbsp;Nikolai Torgovkin V,&nbsp;Teng Yu,&nbsp;Andrei Zhang,&nbsp;Xinyu Yuan","doi":"10.1016/j.geoderma.2026.118080","DOIUrl":"10.1016/j.geoderma.2026.118080","url":null,"abstract":"<div><div>Loess, kaolin and bentonite are widely distributed in cold regions, and their geotechnical mechanical properties deteriorate significantly under repeated freeze–thaw cycles (FTCs) and low-temperature weathering, which seriously threatens the long-term stability and service life of infrastructure projects. This study investigates and compares the long-term strength and microstructural evolution of loess, kaolin, and bentonite subjected to FTCs. The applicability of existing long-term strength prediction models was evaluated, and microstructural parameters were characterized using mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). Correlation analyses between strength and microstructural parameters were performed, and empirical models describing their relationships were developed. The results show that the long-term strength of loess and kaolin initially increases but then declines sharply with increasing FTCs, whereas the strength of bentonite exhibits continuous deterioration. The Vyalov equation is more suitable for predicting the long-term strength of loess, while the Roman equation performs better for kaolin and bentonite. The time analogy method demonstrates strong predictive capability for all three special soils. SEM imaging indicates a transition from face-to-face to point contacts between soil particles. SEM and MIP results reveal that after FTCs, loess with coarser particles forms an overhead structure dominated by macropores and mesopores. Kaolin presents a dense layered structure with a high proportion of mesopores, whereas bentonite contains considerable amounts of both micropores and macropores, with both structures present. Redundancy analysis (RDA), Pearson correlation analysis, and grey relational analysis reveal that pore morphology exerts the greatest influence on the long-term strength of loess, whereas pore arrangement is the dominant factor for kaolin and bentonite. The grey relational analysis shows that the long-term strength of loess has a higher correlation with macropores, while the long-term strengths of kaolin and bentonite are more closely correlated with mesopores and micropores, respectively. The differences in mechanical behavior among the three soils under FTCs are fundamentally controlled by their mineral-specific structural reorganization mechanisms, including cementation breakdown, particle reorientation, and interlayer delamination. These findings establish a linkage between macroscopic long-term strength and microscopic parameters, providing theoretical support and practical guidance for the long-term performance and hazard mitigation of frozen soil engineering in cold regions.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118080"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nitrogen stoichiometry promotes post-waterlogging soil function recovery through enzymatic bio-indicators and microbiome-associated processes","authors":"Reda M.M. Ahmed,&nbsp;Shancong Wang,&nbsp;Nasr M. Abdou,&nbsp;Mahmoud A. Abdelfattah,&nbsp;Ebtesam E.M. Abdelhadi,&nbsp;Yongchao Wang,&nbsp;Hao Wang,&nbsp;Jiameng Guo,&nbsp;Qinghua Yang,&nbsp;Yulou Tang,&nbsp;Shenjiao Yang,&nbsp;Ruixin Shao","doi":"10.1016/j.geoderma.2026.118078","DOIUrl":"10.1016/j.geoderma.2026.118078","url":null,"abstract":"<div><div>Transient waterlogging fundamentally disrupts soil nitrogen (N) cycling, yet the dominant constraint on post-drainage recovery remains debated: persistent hypoxia or stoichiometric nutrient imbalance. We compared two recovery strategies following a 4-day field waterlogging event: chemical nitrogen rescue (4dFN) and passive physical aeration (4dFO₂). Waterlogging induced pronounced anaerobic conditions, evidenced by elevated dehydrogenase activity and disrupted ammonium-to-nitrogen (NH₄/NO₃) ratios. Passive re-aeration was inferior to N-supplementation in terms of restoring soil–plant functioning when nitrate pools were depleted. Linear mixed-effects models accounting for spatial block heterogeneity revealed that short-term changes in soil organic matter and total N reflected shifts in analytically defined, labile pools rather than net losses of stabilized soil stocks. High-throughput 16S rRNA sequencing indicated a pronounced microbial legacy effect during the recovery phase, where bacterial diversity at 2 weeks post-drainage was strongly associated with final N uptake. Random forest, Principal Component Analysis, and correlation network further showed that recovery trajectories were consistent with inorganic nitrogen balance and enzyme-mediated soil quality dynamics. Collectively, these results suggest that under these experimental conditions, post-waterlogging recovery is more closely associated with nitrogen stoichiometric imbalance than residual hypoxia. Effective remediation therefore requires restoring bioavailable N to re-couple soil biochemical processes and plant uptake, rather than relying on drainage alone.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118078"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149092137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pathways of soil organic carbon stabilization driven by long-term straw returning practices in a rainfed agroecosystem","authors":"Gu Fengxue,&nbsp;Wang Hetan,&nbsp;Yang Zhenxing,&nbsp;Zhou Huaiping,&nbsp;Zhang Wenju,&nbsp;Sun Dongbao,&nbsp;Mei Xurong,&nbsp;Li Suhang","doi":"10.1016/j.geoderma.2026.118077","DOIUrl":"10.1016/j.geoderma.2026.118077","url":null,"abstract":"<div><div>Enhancing soil organic carbon (SOC) stability is a central strategy for achieving carbon sequestration, emission reduction, and sustainable soil fertility improvement in rainfed agroecosystems. Straw returning is a widely adopted practice to increase SOC stocks, yet the microbially mediated mechanisms by which different straw return modes regulate SOC stabilization remain poorly constrained, particularly across the Loess Plateau of China. Here, we leveraged a 30-year field experiment in a rainfed maize system to compare three straw return strategies under equivalent carbon input: straw mulching (S1), shredded straw incorporation (S2), and livestock digestion return (S3). We integrated physical aggregate fractionation with multi-biomarker analyses (lignin phenols, amino sugars, and phospholipid fatty acids) and extracellular enzyme assays to elucidate the divergent pathways of SOC stabilization. Our results demonstrated distinct carbon stabilization pathways among the three treatments. S1 followed a physical protection pathway, characterized by the highest fungal-to-bacterial ratio and the preservation of plant-derived lignin within macroaggregates, but resulted in a limited SOC increase (+15.56 %) and low carbon conversion efficiency (+17.45 %). S2 represented an intermediate fungal decomposition pathway; although lignin phenol content increased significantly across all aggregate fractions, high ligninolytic enzyme activities consumed substantial carbon, yielding a moderate SOC gain of + 19.44 %. In contrast, S3 achieved synergistic stabilization via microbial transformation. The low C/N ratio of manure alleviated nutrient limitation, fostering a bacterial- and actinobacterial-dominated community (reaching 84.96 nmol·g⁻¹ PLFA in microaggregates) and upregulating hydrolytic enzyme activities by 73.93 %–193.65 %. This shift promoted the formation of microaggregates (+21.18 %) and silt–clay particles (+40.55 %), with microbial necromass contributing &gt; 40 % to stable SOC pools. Consequently, S3 maximized SOC storage with a 40.00 % increase and achieved the highest carbon conversion efficiency (+29.15 %). These findings highlight that livestock-mediated straw return optimizes the continuum of bacterial proliferation, microaggregate assembly, and microbial necromass accrual, representing an effective strategy for enhancing both the magnitude and long-term stability of SOC in dryland agroecosystems on the Loess Plateau.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118077"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149092138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biobased fertilizers strengthen phosphorus dynamics and reshape soil microbial communities in a Mediterranean wheat-sunflower rotation on a calcareous Vertisol","authors":"Sana Boubehziz,&nbsp;Vidal Barrón,&nbsp;Antonio Delgado,&nbsp;María Carmen del Campillo,&nbsp;Antonio Rafael Sánchez-Rodríguez","doi":"10.1016/j.geoderma.2026.118079","DOIUrl":"10.1016/j.geoderma.2026.118079","url":null,"abstract":"<div><div>Biobased fertilizers could be sustainable alternatives to mineral inputs and restore soil functionality, but their effect in calcareous soils with limited phosphorus (P) phytoavailability remains unclear. This study aimed to evaluate the effect of certain biobased fertilizers on soil functionality. A two-year field experiment in a wheat-sunflower rotation on a calcareous Vertisol was developed involving: Commercial Plant Residue (CPR), Composted Digestate (DIG), Composted Olive Mill Pomace (OMP), Composted Urban Organic Waste (UOW) and Vermicompost (VER), which were compared with Diammonium Phosphate (DAP) and no P addition (CON) for their effect on soil [pH, soil organic matter (SOM), nutrients availability and microbial communities (bacteria and fungi)] and plant growth (biomass, yield, and P uptake). Compared with CON, UOW improved soil P availability by 55% and plant P uptake by 26%, and produced higher apparent P use efficiency (PUE) than DAP, while promoting putative SOM decomposers such as <em>Microascus</em>, and <em>Arachnomyces</em>. OMP increased SOM accumulation by 41%, fungal β diversity, and microbial P biomass by 225%, relative to CON, indicating a shift toward biologically mediated P retention and recycling, which may support their residual effect but limited short-term P availability. VER favored rapid nutrient turnover and enhanced PUE, whereas DIG and CPR showed limited effects on soil variables, likely due to a stoichiometric imbalance affecting the SOM mineralization process. UOW was the most promising biobased fertilizer to replace DAP and restore soil functionality in this calcareous soil. Overall, fertilizer composition and C:N:P stoichiometry drove the agronomic and ecological performance of these biobased fertilizers.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"474 ","pages":"Article 118079"},"PeriodicalIF":7.9,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149150547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}