Geoderma最新文献

{"title":"Forest conversion effect on soil nitrogen transformation and nitrous oxide emissions worldwide","authors":"Zhenggao Xiao ,&nbsp;Shuting Yang ,&nbsp;Xie Wang ,&nbsp;Lei Meng ,&nbsp;Tongbin Zhu ,&nbsp;Christoph Müller ,&nbsp;Ahmed S. Elrys","doi":"10.1016/j.geoderma.2025.117373","DOIUrl":"10.1016/j.geoderma.2025.117373","url":null,"abstract":"<div><div>Understanding soil nitrogen (N) storage and loss following forest conversion is crucial to evaluate land resource utilization and environmental impacts. However, forest conversion altering soil N dynamics and nitrous oxide (N₂O) emissions and their driving factors remain largely unknown. Here, we conducted a global <em>meta</em>-analysis of 97 published papers to evaluate the effect of forest conversion (e.g., conversion of primary forests to secondary forests, managed plantations, grasslands, or croplands) on soil N transformations and N₂O emissions. We found that forest conversion decreased gross N mineralization and ammonium concentration due to reduced soil microbial biomass, total carbon, and total N. Conversely, forest conversion overall increased autotrophic nitrification and N₂O emissions due to the increased ammonia-oxidizing bacteria and archaea abundances. Primary forest converting to croplands and plantations notably increased soil N₂O emissions in temperate and tropical zones. Structural equation model showed that increased ammonium and nitrate levels, and decreased total carbon were the main factors inducing soil N₂O emissions in unfertilized ecosystems, while the increased nitrate was a key factor inducing soil N₂O emissions in fertilized ecosystems. Altogether, our results suggest that forest conversion overall limits soil N storage while stimulating N₂O emissions, highlighting the importance of conserving primary forests to reduce N losses and the negative impacts on the environment.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117373"},"PeriodicalIF":5.6,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144189621","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":"Understanding the effects of organic versus conventional farming on soil organic carbon characteristics – a chronosequence study","authors":"Guusje J. Koorneef ,&nbsp;Mirjam M. Pulleman ,&nbsp;Ron G.M. de Goede ,&nbsp;Pierre Barré ,&nbsp;François Baudin ,&nbsp;Sophie Q. van Rijssel ,&nbsp;Rob N.J. Comans","doi":"10.1016/j.geoderma.2025.117371","DOIUrl":"10.1016/j.geoderma.2025.117371","url":null,"abstract":"<div><div>Organic farming aims at producing high quality, nutritious food while sustaining the health of soils and ecosystems, for which it relies on ecological processes. The amount and quality of soil organic carbon (SOC) influence many soil ecological processes that underlie ecosystem services. However, the effect of organic farming on the amount and especially the quality of SOC is not yet clear. We therefore investigated the long-term influence of organic arable farming on SOC characteristics in topsoil (0–15 cm).</div><div>We sampled a chronosequence of certified organically managed commercial farms (0–34 years of organic farming) on clay-dominated soils, paired with nearby conventional counterparts. A similar chronosequence (0–69 years of organic farming) was established on sand-dominated soils. Alongside soil samples, we collected basic information on soil management such as crop rotation and fertilization. Total SOC content and soil properties that influence SOC were measured (i.e., pH, content of silt, clay, iron oxides and aluminum oxides). Four different techniques were used to characterize SOC quality, i.e., permanganate oxidizable carbon (POXC), Rock-Eval thermal analysis, size fractionation into particulate (POM) and mineral-associated (MAOM) organic matter, and elemental C:N analysis.</div><div>In the clay chronosequence, particularly for soils with a low Fe oxide content, we found that organic farming can increase the total SOC content and labile organic carbon fractions over time, thus resulting in a lower overall SOC stability. We also found indications that the effects of management on SOC quality depend on the total SOC content. In the sand chronosequence, the duration of organic farming did not affect the content nor quality of SOC, potentially because management practices influencing SOC cycling were not distinctive for organic vs. conventional farming in the sand but were in the clay chronosequence.</div><div>Despite our strict farm selection criteria, large variations in environmental soil conditions, farm-specific practices, and land use history challenged the identification of individual processes that drive the observed changes in SOC dynamics in response to organic farming. This variation also highlighted the importance of intrinsic soil properties for SOC dynamics, and the need to develop soil-specific farm management recommendations. Despite this complexity, this study has clearly revealed the potential of organic farming to change SOC cycling towards a higher and overall more bioavailable SOC content, thus strengthening associated ecosystem services.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117371"},"PeriodicalIF":5.6,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177724","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":"Characterization of imogolite-type nanoparticles in Podzols: morphology and association with iron","authors":"Tove Florén ,&nbsp;Manuel Bartolomé Díaz ,&nbsp;Geert Cornelis ,&nbsp;Stephen Hillier ,&nbsp;Jon Petter Gustafsson","doi":"10.1016/j.geoderma.2025.117376","DOIUrl":"10.1016/j.geoderma.2025.117376","url":null,"abstract":"<div><div>Imogolite-type nanoparticles (ITN) are among the most extensively studied particles present in the Bs horizons of Podzols, as they are strongly associated with the adsorption processes of different anions in soils, including phosphate. The aim of this study was to assess the properties of ITN in soil, in order to increase the current knowledge of ITN regarding adsorption models. ITN were isolated from the B horizons of three Swedish Podzols and characterised in terms of size distribution, morphology, elemental composition, and association with iron. Appreciable amounts of ITN were found in two of the three soil samples studied, reaching up to 14 % ITN by mass if all oxalate-extractable Si is assigned to ITN. Furthermore, substantial amounts of Fe were also present in the selected soil samples. Proto-imogolite (PIM) was the predominant form of ITN, suggesting that tubular imogolite have a lower contribution for ion adsorption reactions in Podzols. Three types of PIM morphology were identified: structureless amorphous clusters, fragmented nanotubes, and globular aggregates. The studied PIM, which exhibited a particle size around 50 nm, contained up to 19 % Fe, while no detectable amounts of Fe were found in tubular imogolite. Regarding PIM, Fe atoms were evenly distributed in the structure, providing evidence for the presence of a substituted and/or surface-adsorbed Fe phase, rather than large ferrihydrite clusters. The present study provides novel insights into the properties of ITN and its association with Fe, which will aid in the development of models predicting the fate of oxyanions in Podzols and other ITN-containing soils.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117376"},"PeriodicalIF":5.6,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184320","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":"Early pedogenesis of a young Technosol made from organic wastes","authors":"B.J.P. Grard ,&nbsp;A. Barrier-Guillot ,&nbsp;C. Chenu","doi":"10.1016/j.geoderma.2025.117343","DOIUrl":"10.1016/j.geoderma.2025.117343","url":null,"abstract":"<div><div>Constructed soils based on urban waste, i.e. Technosols appear as a promising solution to enhance circular economy while delivering ecosystem services. Their ability to provide such services depend on their constitution as well as on their temporal evolution and pedogenesis, which is poorly known. We studied during three years the changes in an isolatic Technosol made essentially of organic urban wastes.</div><div>The study took place on a Parisian rooftop with an experimental trial of 24 plots. We compared four Technosols with similar upper layers (a mix of biowaste compost and spent mushroom substrate), but with either a mineral (shredded tiles and bricks) or an organic lower layer (shredded wood). Both types were run with and without plants. Technosols were monitored over three years and samples were taken at different times to study pedogenetic processes.</div><div>We observed a rapid and sharp volume loss of the Technosols, responsible for an important mass loss, but not leading to any increase in bulk density. A clear physico-chemical differentiation of treatments from the parent materials appeared after one and three years. The Technosoil organic C stocks decreased over time. During three years, all Technosols were a net source of nitrogen and dissolved organic carbon, released in the drainage waters. Identified pedogenesis processes were the same as in natural soils, but the changes were very fast. The key equilibrium between mineralisation of organic matter and its stabilization that must be ensured when creating such Technosols. They show the necessity for long term research on the development of Technosols.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117343"},"PeriodicalIF":5.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166549","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":"Biochar stimulates nitrogen loss in anoxic soil through ammonium oxidation coupled with iron reduction","authors":"Bo Yi ,&nbsp;Qichun Zhang ,&nbsp;Steven J. Hall ,&nbsp;Xiang Zou ,&nbsp;Wenjuan Huang ,&nbsp;Wenjuan Yu ,&nbsp;Qinsi He ,&nbsp;Peiyu Cao ,&nbsp;Jing Hou ,&nbsp;Jiuwei Song ,&nbsp;Hongjie Di ,&nbsp;Chaoqun Lu","doi":"10.1016/j.geoderma.2025.117372","DOIUrl":"10.1016/j.geoderma.2025.117372","url":null,"abstract":"<div><div>Anaerobic ammonium oxidation coupled with iron (Fe) reduction, known as Feammox, is an important nitrogen (N)-cycling pathway in anoxic soils. Biochar, widely employed as a soil amendment, has been reported to influence N dynamics through its redox-active moieties, but the effects on Feammox of biochar produced with different pyrolysis temperatures remain poorly understood. We conducted a slurry incubation in rice-paddy soil with ¹⁵N-isotope tracing to examine the impact of biochar pyrolyzed at 300 °C and 600 °C on Feammox under different Fe availability conditions (addition of ferrihydrite, goethite, or no Fe). Biochar pyrolysis temperature and Fe availability impacted rates of Feammox. Specifically, adding biochar pyrolyzed at 600 °C to soil at a 2 % mass ratio stimulated N loss through Feammox by 0.03 to 0.07 μg N g⁻¹ soil d^-1, likely by facilitating electron transfer via its surface redox-active moieties. Feammox was highly correlated with Fe reduction despite contributing only a small fraction to overall Fe reduction. Feammox rates were greatest with ferrihydrite addition and lowest with no Fe addition, and correlated with the abundance of a known Feammox bacterium (<em>Acidimicrobiaceae</em> bacterium A6). In contrast, biochar pyrolyzed at 300 °C did not stimulate Feammox, likely due to a lack of electron shuttling capacity. Overall, our findings highlight a stimulation effect of biochar pyrolyzed at high temperature on promoting N loss as dinitrogen, underscoring its potential utility for environmentally-friendly removal of excess N from anoxic soil.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117372"},"PeriodicalIF":5.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177723","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":"What is the best way to communicate the uncertainty of a digital soil mapping product? Some lessons from an end-users survey","authors":"Léa Courteille ,&nbsp;Léa Tardieu ,&nbsp;Nadia Boukhelifa ,&nbsp;Evelyne Lutton ,&nbsp;Philippe Lagacherie","doi":"10.1016/j.geoderma.2025.117302","DOIUrl":"10.1016/j.geoderma.2025.117302","url":null,"abstract":"<div><div>Uncertainty in digital soil mapping products is generally quantified and presented alongside the predictions in the form of a second raster map. However, it remains a challenge for end-users to integrate this additional information into their decision-making, and as a result, they tend to ignore uncertainty. The Digital Soil Mapping (DSM) literature has identified two levers for better communicating uncertainty: uncertainty representations that allow users to integrate uncertainty better than with a separate raster map, and spatial aggregation, which consists of representing the spatial information at a coarser resolution to reduce its uncertainty. For the first time in DSM, we involved a large number of end-users (263 people) via a web-based survey to evaluate alternative cartographic representations of soil map uncertainty. Respondents were assigned a decision-making task and asked to select the map that offered the best support, choosing between two maps that displayed the same soil information but differed in how uncertainty was represented and/or in the level of spatial aggregation. The choices made by the respondents as well as the comments they left at the end of the study provided a large dataset from which we could identify factors driving their preferences. We demonstrate that end-users strongly prefer uncertainty to be shown on a separate map, and also favor moderately aggregated maps. Our results question the conventional representation of soil data using high-resolution and high-uncertainty maps. We hope that this work will be valuable to scientists in soil science, as well as in other environmental mapping communities, such as ecosystem services and biodiversity, and help them more effectively communicate uncertainty to their end-users.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117302"},"PeriodicalIF":5.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166356","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":"A simple pedotransfer function to estimate fine fraction organic carbon contents of surface horizons in French soils","authors":"Eva Rabot ,&nbsp;Pierre Barré ,&nbsp;Claire Chenu ,&nbsp;Amicie A. Delahaie ,&nbsp;Manuel P. Martin ,&nbsp;José-Luis Munera-Echeverri ,&nbsp;Nicolas P.A. Saby","doi":"10.1016/j.geoderma.2025.117366","DOIUrl":"10.1016/j.geoderma.2025.117366","url":null,"abstract":"<div><div>It has been proposed to separate soil organic carbon (SOC) into two physical fractions, i.e., fine fraction organic carbon (OC_fine) and coarse fraction organic carbon, to improve our ability to understand controlling factors and predict SOC contents and SOC stability. In this study, we aimed at building a simple pedotransfer function to estimate OC_fine content measured using a size fractionation protocol in French soils. We define OC_fine as SOC content measured in the &lt; 50 µm fraction. We used information from the French Soil Quality Monitoring Network (RMQS, 706 observations) and from a literature search (245 observations) to build and validate the pedotransfer function. We used the Random Forest algorithm and partial dependence plots in an exploratory data analysis, to analyze the variables influencing OC_fine contents and to study the shape of their relationship with OC_fine. Using the knowledge gained from the exploratory analysis, we constructed a simple pedotransfer function. A slight inflection in the OC_fine content was detected with increasing SOC content and a good approximation of OC_fine content was reached using a second-degree polynomial relationship, with distinct coefficients depending on the land cover (i.e., croplands and permanent crops, grasslands, natural grasslands, and forests and shrubs). A cross-validation of the pedotransfer function led to an RMSE of 2.2 g kg⁻¹ and an independent validation led to an RMSE of 2.0 g kg⁻¹. The domain of applicability of the pedotransfer function was defined as being restricted to topsoil horizons and a SOC content ≤ 90 g kg⁻¹. The estimated OC_fine is deemed equivalent to a measure after a complete soil dispersion and a size fractionation protocol. The proposed pedotransfer function could be easily used in future soil carbon modeling frameworks. From a land management perspective, the shape of the relationship found between SOC and OC_fine encourages increasing SOC levels to store more carbon in soil, including in the OC_fine fraction.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117366"},"PeriodicalIF":5.6,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166357","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":"Nitrogen and phosphorus fertilizer use efficiency: the interactive effects of fertilization and liming","authors":"Xing Yu ,&nbsp;Claudia Keitel ,&nbsp;Rumainul Islam ,&nbsp;Feike A. Dijkstra","doi":"10.1016/j.geoderma.2025.117362","DOIUrl":"10.1016/j.geoderma.2025.117362","url":null,"abstract":"<div><div>Nitrogen (N) and phosphorus (P) play important roles in increasing agricultural productivity. However, excessive use of N and P fertilization can result in low N and P fertilizer use efficiencies (<em>RE_N</em> and <em>RE_P</em>) and loss of N and P through gaseous emission and leaching, but which also depend on soil pH conditions. In a full factorial glasshouse experiment using pots with 2.5 kg soil and adding N (0 and 100 kg N ha⁻¹), P (0 and 50 kg P ha⁻¹) fertilizer and lime (0, 3.5, 14 t ha⁻¹, 100 % calcium carbonate equivalent) we investigated the main and interactive effects of our treatments on <em>RE_N</em> and <em>RE_P</em> in wheat (<em>Triticum aestivum</em>) grown in a P-poor soil. The <em>RE_N</em> was close to zero without P fertilization regardless of liming, but increased to 46 % with P fertilization (averaged across liming treatment) because of strong P limitation. Likewise, N fertilization increased <em>RE_P</em> from 6 % to 8 % averaged across the liming treatment. However, liming decreased <em>RE_N</em> (only when P fertilizer was added), possibly because of enhanced net N mineralization in the soil making plants less dependent on N fertilizer with liming, and increased <em>RE_P</em>, possibly because of reduced fertilizer P-immobilization in the soil with low pH. Overall, N and P fertilizer and lime addition changed <em>RE_N</em> and <em>RE_P</em> by changing wheat growth along with N and P uptake, thereby affecting soil available nutrients, nitrous oxide emissions and N and P loss through leaching. We highlight the importance of adjusting N and P fertilization with liming to optimize <em>RE_N</em> and <em>RE_P</em> and reduce N and P loss.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117362"},"PeriodicalIF":5.6,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166366","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":"Root traits of different wheat cultivars influence soil structure: an X-ray computed tomography and root morphology study","authors":"Bartolo Giuseppe Dimattia ,&nbsp;Angela Righi ,&nbsp;Matteo Bettuzzi ,&nbsp;John Koestel ,&nbsp;Maria Pia Morigi ,&nbsp;Rosa Brancaccio ,&nbsp;Silvio Salvi ,&nbsp;Maria C. Hernandez-Soriano ,&nbsp;Marco Bittelli","doi":"10.1016/j.geoderma.2025.117349","DOIUrl":"10.1016/j.geoderma.2025.117349","url":null,"abstract":"<div><div>Plant roots play a fundamental role in maintaining soil health. Although a broad range of root traits have been reported, few studies have attempted to link root morphology with soil structure. Here, we used shovelomics to characterize the root morphology of a wheat cultivar (Paragon), and two landraces (Senatore-Cappelli, and Watkins238), and advanced soil pore and root network X-ray computed tomography to assess their impact on soil morphology at cylinder and aggregate scales. Bare soil was analyzed as a control. Minkowski functionals and percolation theory parameters were computed to characterize soil pore network morphology. Bioporosity at the cylinder scale was significantly different for all cultivars compared to the bare soil. Bare soil presented the largest structural pore volume and the smallest biopore volume, this suggesting rapid degradation of biopores. At the cylinder scale, biopore characteristics were significantly different between Senatore-Cappelli and Watkins238, with Senatore-Cappelli exhibiting more pores with diameters &gt;1 mm. The parameters from percolation theory revealed notable differences between the rhizospheric and bare soil samples. We found significant differences between genotypes, finding statistically significant correlations among root morphology parameters and pore network geometry.</div><div>Total imaged porosity and total root volume were limited descriptors of the effect of roots on soil structure, which is better quantified by pore network connectivity measurements. Our findings confirm previous studies on the relationship between root traits and soil properties and highlight the potential of our experimental approach to explore how different genotypes may influence soil morphology, paving the way for future applications in plant phenotyping.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117349"},"PeriodicalIF":5.6,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138667","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":"Enhancing Soil Carbon Storage: Developing high-resolution maps of topsoil organic carbon sequestration potential in Taiwan","authors":"Shih-Hao Jien ,&nbsp;Budiman Minasny ,&nbsp;Bo-Jiun Yang ,&nbsp;Yu-Ting Liu ,&nbsp;Chun-Chien Yen ,&nbsp;Mel Adelle Ocba ,&nbsp;Yi-Ting Zhang ,&nbsp;Chien-Hui Syu","doi":"10.1016/j.geoderma.2025.117369","DOIUrl":"10.1016/j.geoderma.2025.117369","url":null,"abstract":"<div><div>Developing methods to estimate Soil Organic Carbon sequestration potential (SOC_sp) at the regional scale is essential for quantifying the additional stable carbon that soils can sequester for climate change mitigation. This study investigates methods to estimate SOC_sp across Taiwan. It evaluates three methods for estimating SOC saturation in fine fraction soils (less than 53 µm) (Hassink, boundary line, and quantile regression) using high-density sampling (more than one site per square km in cultivated areas) and digital soil mapping. Results show that SOC_sp derived from the boundary line approach was about 2.1 times higher than those estimated by the quantile regression (QR) approach. Estimates using the QR approach could be regarded as the technically achievable goal as most of the samples collected from cultivated soils had low SOC content. A moderate spatial model for SOC_sp was achieved using random forest model (R²: 0.54–0.57) on validation samples. Soil type, temperature and elevation were important controlling factors of SOC_sp in topsoil. Regions with high SOC_sp were mainly located in intensively cultivated and clay-rich soils, with paddy soils exhibiting greater sequestration potential compared to other land uses. In contrast, most forest soils in slope and mountainous areas had low SOC_sp, as their SOC levels were near or above estimated saturation in the fine fraction soils. This study offers practical and strategic insights for scientific and policy-oriented efforts to improve soil health, boost carbon sequestration, and address climate change through optimisation of land use.</div></div>","PeriodicalId":12511,"journal":{"name":"Geoderma","volume":"459 ","pages":"Article 117369"},"PeriodicalIF":5.6,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138754","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}