Geoderma Regional

Article	Citations
Comparison of soil exchangeable calcium estimated using five extractants and near-infrared spectroscopy	101
13C evidence for the selective loss of active and inert organic carbon in soil aggregates under rain-induced overland flow erosion	75
How magnetism-based fractional spinels contribute to the bioavailability of geogenic chromium in serpentine soils of Taiwan	58
Corrigendum to “Biochar soil amendment as carbon farming practice in a Mediterranean environment” [Geoderma Regional, 33, 2013, e00634]	46
Quantifying CO2 emissions from Quebec's agricultural peatland and identifying key parameters for guiding soil conservation strategies	44
Soil health indicators in oil palm agroforestry systems in the eastern Amazon, Brazil	40
Based on soil carbon saturation capacity what is the potential for soil carbon improvement in rice-based cropping systems of northwest region of Bangladesh?	40
Early-stage soil organic carbon stabilization in conservation agriculture-based cereal systems	37
Grass cover and shallow tillage inter-row soil cultivation affecting CO2 and N2O emissions in a sloping vineyard in upland Balaton, Hungary	34
Sensitivity and sustainability of soil quality indicators of Epicalcic Chernozem under soil erosion control technologies	34
Soil science research priorities in the United States	32
Ammonia emission and nitrogen use efficiency with application of nitrification inhibitor and plant growth regulator in a calcareous soil (Karaj, Iran)	30
Spatial variability of soil, water, and vegetation in a Patagonian wetland: Implications for sustainable land management planning	28
Soil priorities for the Czech Republic	28
Applying RUSLE for soil erosion estimation in Romania under current and future climate scenarios	26
Polycyclic aromatic hydrocarbons concentration and spatial distribution in the soils of Santiago de Compostela (northwestern Spain)	26
Tracking pedogenic carbonate formation and alkalinity migration in agricultural soils amended with crushed wollastonite ore – Evidence from field trials in Southwestern Ontario	23
Response of soil nutrient losses to erosion-deposition processes and land use managements: A case study in southeastern Tigray of northern Ethiopia	23
Identifying opportunities to improve digital soil mapping in India: A systematic review	23
Corrigendum to ‘Mapping sub-surface distribution of soil organic carbon stocks in South Africa's arid and semi-arid landscapes: Implications for land management and climate change mitigation’ [Geoderm	22
Maintaining favourable carbon balance in boreal clay soil is challenging even under no-till and crop diversification	22
From global trends to local realities: SOC accrual of improved management practices in northwestern Europe	21
Eutrophic soils and weathering levels influence the distribution of seasonally dry forests in Brazil	21
Enhancing agroecosystem sustainability: Integrative soil health strategies in regenerative organic soybean production on Andosol in Japan	21
Genesis, paleoenvironmental history and landscape interplays of Holocene buried soils in Minas Gerais, Southeastern Brazil	20

Copper isotope signatures during red earth weathering and their significance for soil reticulation (Xuancheng, South China)	20
Conventional soil test phosphorus failed to accurately predict dissolved phosphorus release in agricultural hydromorphic soils in Brittany, Western France	19
Microbial and thermal indices of organic matter stability in lowland soils with variable texture	19
Catena of Ultisols from southeastern Brazil: Assessing variation within and among pedons	18
Variations, controls and predictions of soil saturated hydraulic conductivity under different land use types in the alpine region of Tibet, China	18
Tamarugite, NaAl(SO4)2·6H2O, as a valuable indicator of soil degradation in a Spanish coastal wetland receiving acidic leachates from spilled mine waste	18
Vegetation degradation alters soil physicochemical properties and potentially affects ecosystem services in green spaces of a tropical megacity (Lubumbashi, DR Congo)	17
Using proximal sensors to assess pedogenetic development of Inceptisols and Oxisols in Brazil	17
Impact of cover crops on soil physical properties, soil loss and runoff in compacted Oxisol of southern Brazil	16
An analysis of PAH soil contamination in south east England: A case study leading to an evidence-based portfolio and process route map	16
Soil carbon stabilization of mining-degraded, reforested lands in southern Ontario	16
Spectroscopic characteristics of humic acids extracted from soils under different integrated agricultural production systems in tropical regions	16
Mapping sub-surface distribution of soil organic carbon stocks in South Africa's arid and semi-arid landscapes: Implications for land management and climate change mitigation	16
Assessing monthly dynamics of agricultural soil erosion risk in Poland	15
Critical limits for microbiological properties and soil quality in a subtropical Acrisol in southern Brazil	15
The combined impacts of land use change and climate change on soil organic carbon stocks in the Ethiopian highlands	15
Predicting soil organic carbon content using simulated insitu spectra and moisture correction algorithms in southern Xinjiang, China	15
Mapping and monitoring peatlands in the Belgian Hautes Fagnes: Insights from Ground-penetrating radar and Electromagnetic induction characterization	15
Removing the moisture effect on predicting soil organic matter using vis-NIR spectroscopy with external parameter orthogonalization	15
Wind erosion escalation in western Slovakia driven by climate and land use and land cover shifts	14
Challenges in viticulture practices in a changing environment: Can green waste amendment benefit soil properties of vineyards in the Mediterranean?	14
Soil priorities in Israel	13
Enhancing “Campos” grassland productivity by improving soil fertility and overseeding: A meta-analysis	13
Land use and soil types affect macropore network, organic carbon and nutrient retention, Lithuania	13
Pedobiological properties of a lignite spoil heap in the Provence coal mine basin (south-east of France)	13
Soil carbon stocks can be negatively affected by land use and climate change in natural ecosystems of semi-arid environment of Iran	12
Efficacy of three nitrification inhibitors to reduce nitrous oxide emissions from pig slurry and mineral fertilizers applied to spring barley and winter wheat in Denmark	12
Subsurface drainage and nitrogen management affects soil properties in upstate Missouri U.S.	12
Organic carbon stored in soils under different land uses and soil textures in southeast Argentinean Mesopotamia	12
High-resolution mapping of soil carbon stocks in the western Amazon	12
Quantitative relationships between Munsell colour attributes and organic carbon in highly weathered tropical soils	12
The Brazilian soil priorities	12
Spatio-temporal dynamics of land use patterns on soil health in the Central Black Sea Region	12
Impacts of reclaimed water irrigation on mulch decomposition, microbial activity, and soil nutrient availability in the Brazilian semi-arid	12
Evaluating dynamic soil quality by the soil management assessment framework (SMAF) in the watershed scale in a semi-arid Mediterranean ecosystem in Turkey	11
A coupled model of greenhouse gas emissions from erosion and accretion prone zones of mangrove ecosystem, Sundarban, India	11
Mapping soil corrosivity in an Australian arid environment and comparing corrosion rates of exclusion fence netting with different zinc coatings	11
Higher temperature accelerates carbon cycling in a temperate montane forest without decreasing soil carbon stocks	11
Sorghum and cowpea intercropping response to woody residue amendments in Sahelian agro-ecosystems of Burkina Faso	10
Soil research, management, and policy priorities in Chile	10
Interactive effects of soil salinity and nitrogen fertilizer types on nitrous oxide and ammonia fluxes	10
Editorial for Geoderma Regional	10
Proximal sensor data fusion for Brazilian soil properties prediction: Exchangeable/available macronutrients, aluminum, and potential acidity	10
Newly established, multifunctional woody polycultures preserve agroforestry soil health benefits of a widespread U.S. land retirement program	10
Changes in microbial biomass and activity of tropical soil submitted to successive Eucalyptus rotations in the semi-arid region of Brazil	10
Wetting and drainage cycles in two New Zealand soil types: Effects on relative gas diffusivity and N2O emissions	10
Impact of anthropogenic pollution on soil properties in and around a town in Eastern India	10
Nitrogen loss due to nitrate reduction in the soil profile depends on the type of cropland	10
Heavy minerals as indicators of source material in soils on carbonates	10
Rodent burrows in chernozems as a paleoarchive of vegetation dynamics: A case study from the central chernozem region of Russia	9

Distribution and potential of rare earth elements fingerprinting as tracers for carbonate sources in soils developed on contrasting parent materials	9
Bioenergy production effects on SOM with depth of loblolly pine forests on Paleaquults in southeastern USA	9
Exchangeable acidity characteristics of farmland black soil in northeast China	9
Shallow soils in dryland ecosystems: Drivers of C accumulation and land management implications	9
Exploring the physical properties of Australian alpine soils to inform ecosystem restoration	9
Relative and absolute difference in soil organic carbon stocks in grassland soils in Ireland: Impact of rock fragments, bulk density and calculation methods	9
Interplay of weathering, formation of secondary mineral soil constituents, and soil organic matter in South German Umbrisols	9
Zoogenic soil horizons – termite ecosystem engineers in different agro-ecological regions of Mozambique	9
Influence of parent material and land use on abiotic N2O production following NH2OH and NO2− addition	9
Fertility status of Chernozems and Phaeozems under different moisture regimes in southwestern Poland	9
Immobilization of potentially toxic elements by grape waste biochar in contaminated soils	9
Chernozems in Czechia: Soil properties, classification and environmental controls	9
Morphology and distribution of biological soil crusts and their potential role in soil-forming processes under dry high-altitude periglacial conditions (Eastern Pamir, Tajikistan)	9
Mid-infrared spectral insights into soil hydraulic, physical, and chemical properties across four Moroccan regions	9
Accounting for the spatial variation of phosphorus available explained by environmental covariates	9
Biochar-fertilizer interaction increases nitrogen retention, uptake and use efficiency of cinnamomum camphora: A 15N tracer study	9
Soil priorities for Hungary	8
Soil mapping and characterization of the Mapou basin, Haiti	8
Mapping soil parent materials in a previously glaciated landscape: Potential for a machine learning approach for detailed nationwide mapping	8
Comparison of long-term field-measured and RUSLE-based modelled soil loss in Switzerland	8
Comparison of methods for determining organic carbon content of urban soils in Central Ohio	8
Magnetic and spectral signature of anthropogenic and non-anthropogenic soils to identify pedogenetic processes in Amazonia, Brazil	8
Landscape and topography effects on phosphorus fractions in Mollisols of the Argentinean Pampas	8
Spatial variability of soil secondary and micronutrients under smallholder maize production system in sub-humid condition of Zimbabwe	8
Land-use change affects carbon storage and lability in tropical soil of India	8
Assessing the impact of soil use and management systems on soil health in Southern Brazil	8
Corrigendum to “Geochemistry and microbiology of boreal alluvial soil under salinization” [Geoderma Regional 38 (2024) e00842]	8
Effects of climate and land-use on physicochemical properties of gneiss-derived soils in tropical drylands: Evidence from northeastern Brazil	8
Changes in land use and buffaloes trampling effects on soil health in environmentally vulnerable areas of an Atlantic Forest biome in southern São Paulo State, Brazil	8
Exploring ethnopedology in the Ecuadorian Andean highlands: A local farmer perspective of soil indicators and management	8
Utilising soil diagnostic features and environmental covariates to estimate nutrient content in Ethiopian soils	8
Provenance of soil parent materials in relation to regional environmental changes in the Songnen Plain, Northeast China	8
Improving the soil physical properties and relationships between soil properties in arable soils of contrasting texture enhancement using biochar substrates: Case study in Slovakia	8
Effects of different tillage and cropping systems on water repellency and hydraulic properties in a tropical Alfisol of southwestern Nigeria	8
Application of mid-infrared spectroscopy for soil analysis in calcareous Argania spinosa forests in Morocco	8
Organic carbon stocks across various land use systems in Sandy Ultisols and Oxisols in Brazil	8
Revegetation is key for soil organic carbon sequestration on abandoned and degraded land in northern Spain	8
The effects of land use change on soil organic carbon stock in China: A meta-analysis with the empirical modeling approach	8
Micronutrients prediction via pXRF spectrometry in Brazil: Influence of weathering degree	8
Soil characteristics within vegetation patches are sensitive indicators of savanna rangeland degradation in central Namibia	7
Differences in soil biological activity and soil organic matter status only in the topsoil of Ferralsols under five land uses (Allada, Benin)	7
Soil priorities around the world - an introduction	7
Soils of the coastal and lower belt of Galápagos Islands – The case of Isla Santa Fé and Isla Santa Cruz	7
The accuracy of soil information influences assessment of soil ecosystem services in Brittany, France	7
Prospects and challenges in the use of models to estimate the influence of crop residue input on soil organic carbon in long-term experiments in Canada	7
Risk of environmental contamination due to the hexazinone application in agricultural soils in northeastern Brazil	7
Relationship of soil moisture characteristic curve and mechanical properties in Entisols and Inceptisols of Iran	7
Crop, livestock, and forestry integration to reconcile soil health, food production, and climate change mitigation in the Brazilian Cerrado: A review	7
Should soil classification be mandatory for manuscripts aiming to publish in Geoderma and Geoderma Regional?	7
Effect of topography on spatiotemporal patterns of soil moisture in a mountainous region of Northwest China	7
Identification of Köppen climate classification and major land resource area in the United States using a smartphone application	7
Mapping basic properties of Danish sandy soils using on-the-go proximal sensors and terrain attributes	7
Prediction of soil organic matter content by combining data from Nix ProTM color sensor and portable X-ray fluorescence spectrometry in tropical soils	7
Zonal patterns and driving factors of soil organic carbon density in Zhejiang Province, China	7
Landscape history mirrored in colluvial profiles: A multi-proxy approach from a Luvisol region in Central Czechia	7
Spatial disaggregation of a legacy soil map to support digital soil and land evaluation assessments in Scotland	7
Estimating organic carbon stocks of mineral soils in Denmark: Impact of bulk density and content of rock fragments	7
Spatial prediction and uncertainty estimation of crucial GlobalSoilMap properties - A contextual study in the semi-arid area of western Iran	7
Probable causes of hardening of redoximorphic features in Plinthosols of the Araguaia River floodplain, Central region of Brazil	7
Kinetic modeling indicates changes in the soil quality of agroecosystems in the Brazilian Cerrado	7
Comparison of PLS and SVM models for soil organic matter and particle size using vis-NIR spectral libraries	7
Land use change and forest management affect soil carbon stocks in the central hardwoods, U.S.	7
Relationships between soil organic carbon fractions and their thermal stability in forest soils (Bavaria, Germany)	7
Predicting soil carbon stock in remote areas of the Central Amazon region using machine learning techniques	7
Modeling archaeological excavation-induced soil erosion in cultural heritage landscapes: A QGeoWEPP-based assessment at the Resuloğlu Mound, Türkiye	7
Termite constructions as patches of soil fertility in Cambodian paddy fields	7
Development and functional evaluation of pedotransfer functions for estimating soil hydraulic properties in Portuguese soils: Implications for soil water dynamics	6
X-ray microtomography analysis of urban soils of the Rostov region	6
Genesis and preservation of patterned ground in permafrost non-affected soils – Central Apennines, Italy	6
Faster topsoil organic matter transformation accompanies long-term carbon preservation in virgin Chernozems	6
Climatic influences on active layer depth between 2000 and 2018 in the McMurdo Dry Valleys, Ross Sea Region, Antarctica	6
Soil erosion and carbon export: A case study in a steep slope grazing landscape	6
Soil management priorities in Korea	6
Soil respiration response to reductions in maize plant density and increased row spacing (Southeast pampas, Argentina)	6
On the impact of grassland management on soil carbon stocks: a worldwide meta-analysis	6
Wildfire burn severity and post-wildfire time impact mechanical and hydraulic properties of forest soils	6
Leaching and ammonia emissions in rice fields exhibit greater influences by seasons than management	6
Factors governing the formation, distribution and taxonomy of soils with glossic horizons and features in the contiguous USA	6
Environmental magnetism linked to weathering processes: A study on surface soils from an East Antarctic oasis	6
Greening and browning of urban lawns in Geneva (Switzerland) as influenced by soil properties	6

Effects of wood ash on the soil properties and fungal community structure in a beech forest in Poland	6
Water content as a deterministic factor in the assessment of cohesive character in soils of Coastal Tablelands (Northeast, Brazil)	6
Land use conversion, climate change and soil organic carbon: Modeling a citrus garden chronosequence in Northern Iran	6
Cover crop mixtures enhance belowground carbon input and suppression of spontaneous flora under Danish conditions	6
Differences in dissolved organic matter (DOM) composition of soils from native eucalypt forests and exotic pine plantations impacted by wildfire in Southwest Australia	6
Soil fertility characterization in Brazilian pastures through soil chemical and physical analysis	6
Evaluation of site position and tillage effects on global warming potential from furrow-irrigated rice in the mid-southern USA	6
Acidification characteristics and its influencing factors of red paddy soil derived from four parent materials in Southeast of China	6
Optimizing soil texture spatial prediction in the Brazilian Cerrado: Insights from random forest and spectral data	6
Exploring phosphorous dynamics within soil aggregate after 17 years long-term manuring in lateritic Inceptisols in rice paddies	6
Ancestral roots: Exploring microbial communities in traditional agroecosystems for sustainable agriculture	6
Impact of crop production and eucalyptus forestry on a Ferralsol under native grassland in southern Brazil	6
Preservation of labile organic compounds is the pathway for carbon storage in a 23-year continuous no-till system on a Ferralsol in southern Brazil	6
Sewage sludge and its biochar as organic amendments: Modulating microbial activity, nutrient dynamics, and chemical properties in sandy soil cultivated with sugarcane	6
Proximal sensing approach for characterization of calcareous soils using multiblock data analysis	5
Spatial prediction of soil organic carbon stocks across contrasting Andean basins, Peru	5
Digital morphometrics and genesis of soils with buried horizons and lithological discontinuities in southeastern Brazil	5
Soil priorities in Japan	5
Digital soil mapping of erosion-induced degradation of Chernozems on the East-European Plain	5
Sources of soil organic carbon under Eucalyptus silvopastures and other land-use systems in Brazilian Oxisols	5
Pedotransfer functions for cation exchange capacity estimation in highly weathered soils of the tropical highlands of NW Cameroon	5
Priorities of soil research and soil management in China in the coming decade	5
Examining farmers' perceptions of soil fertility and its use in field practices in Northern Ghana	5
Evaluation of machine learning algorithms in the prediction of hydraulic conductivity and soil moisture at the Brazilian Savannah	5
Transect sampling for soil organic carbon monitoring in temperate alley cropping systems - A review and standardized guideline	5
Land use change detection and quantification of prime agricultural lands in Southern Ontario	5
Long-term effects of barley residue managements on soil hydrophysical properties in north-western Iran	5
Soil organic matter characterisation using alkali and water extraction, and its relation to soil properties	5
From rock to soil: Elemental mobility during pedogenesis in a deep Ultisol profile at the Mantiqueira Mountain Range, Southeastern Brazil	5
Archaeopedological reconstruction of Middle Bronze Age subsistence farming in SW-Germany from sedimentary archives in the Western Allgäu	5
Effect of biochar and hydrochar of pistachio residues on physical quality indicators of a sandy loam soil	5
Quantitative soil mapping in Sudan−a systematic review	5
Cashew residue biochar enhances the pore network of cohesive soil in the Brazilian Coastal Tablelands	5
Controlling factors of soil organic and inorganic carbon in North Adana, Türkiye	5
Upper limit of mineral-associated organic carbon in temperate and sub-tropical soils: How far is it?	5
Improving the accuracy of digital soil mapping using remote sensing and topography covariates in the Central Dry Zone of Myanmar	5
Combined inorganic and organic fertilizers improved soil microbial biomass and nitrogen dynamics in Upper Eastern region of Kenya	5
Pedogenic variables with color indices of rubified Alfisols in the Kakalachinte microwatershed, Karnataka, South India	5
Soil carbon storage in rangeland ecosystems: The role of land management, climate change, and soil chemical transformations	5
Soil organic carbon stocks in the forested regions of Mongolia and its mitigation potential	5
Gross nitrogen transformation rates in shifting cultivation systems in northern Thailand: Controlling factors and implications for inorganic nitrogen availability	5
Modelling of soil depth and hydraulic properties at regional level using environmental covariates- A case study in India	5
Changes in soil organic carbon fractions in abandoned croplands of Nepal	5
Soil total and available C:N:P stoichiometry among different parent material soil profiles in rubber plantations of Hainan Island, China	5
Assessment of short- to medium-term impacts of bench terrace construction on soil water repellency in north-central Portugal	5
Effects of natural and prolonged crude oil pollution on soil enzyme activities	5
Mapping soil organic carbon stocks in Tunisian topsoils	5
Changes in soil organic carbon and phosphorus status under three different land use systems in a tropical Ultisol	5
No detectable upper limit when predicting soil mineral-associated organic carbon stabilization capacity in temperate grassland of Central Argentina mountains	5
Drivers of tree establishment in planted windbreaks and riparian buffers: A case study of farms in southern Quebec, Canada	5
Assessing the effect of arable management practices on carbon storage and fractions after 24 years in boreal conditions of Finland	5
Assessing the occurrence of soil improvement and its relationship to the dominant life form in the high mountains of Central Spain	5
Kolmogorovʼ entropy to investigate variation of forest soil properties in the Czech Republic	4
Microbial communities of urban and industrial polluted soils in the Russian Arctic	4
High-performance soil class delineation via UMAP coupled with machine learning in Kurdistan Province, Iran	4
Australian priorities for soil research and land manager engagement to improve sustainable soil management	4
Spatial prediction of soil aggregate stability and soil organic carbon in aggregate fractions using machine learning algorithms and environmental variables	4
Predicting soil organic carbon stocks in different layers of forest soils in the Czech Republic	4
Whether canal command irrigation through pressurized irrigation system deteriorates soil properties in hot arid ecosystem of India?	4
Variability of soil organic carbon and nutrient content across land uses and agriculturally induced land use changes in the forest-savanna transition zone of Cameroon	4
Improving digital soil mapping in Bogor, Indonesia using parent material information	4
Research priorities for sandy soils in Central Africa	4
Rapid characterization of soil horizons for different soil series utilizing Vis-NIR spectral information	4
Multivariate regional deep learning prediction of soil properties from near-infrared, mid-infrared and their combined spectra	4
Contour furrowing reduces erosion and enhances soil moisture on semiarid hillslopes	4
Soil carbon sequestration under N fertilized or mixed legume-grass pastures depends on soil type and prior land-use	4
Influence of biochar and compost and their interaction on carbon and nitrogen mineralization in a Saharan sandy soil	4
Substantial amounts of soil organic carbon and macronutrients are stored in deep soil layers under bamboo plantations	4
Seasonal variation-dependent biochar impacts on coastal acid-sulfate soil in paddy fields and the consequences on rice growth and yield	4
Incorporating spatial uncertainty maps into soil sampling improves digital soil mapping classification accuracy in Ontario, Canada	4
Content and quality of soil organic matter in topsoils under different tundra vegetation in central Spitsbergen (High Arctic)	4
Simulating soil organic carbon stock as affected by land use and climate change on volcanic soils in Indonesia	4
Effects of tree species composition in plantation forest on soil aggregate stability and organic carbon pools in northeastern China	4
Digital soil mapping of Italy to map derived soil profiles with neural networks	4
Evaluation of simple and multivariate linear regression models for exchangeable base cation conversion between seven measurement techniques on South African soils	4
Soil priorities in the European Union	4
Soil organic carbon dynamics (2008–2020) across different cultivated land use types in a subtropical region	4
Effects of green onion (Allium fistulosum) cropping on topsoil nitrogen species contents in a Páramo ecosystem	4
Reuse of Tunisian excavated material into composite soil for rainwater infiltration within urban green infrastructure	4
Assessment of zones prone to sinkhole using ground penetrating radar and soil properties in Central Iran	4
The soil-water cost of heavy machinery traffic on a Queensland Vertisol, Australia	4
Smectite-rich horizons in Inceptisols trigger shallow landslides in tropical granitic terranes	4
Dynamics of soil organic carbon pools following conversion of savannah to cocoa agroforestry systems in the Centre region of Cameroon	4
Soil aggregates stability as indicator of soil crust susceptibility in southern Mali using different methodological approaches	4
Using the pedogenic oxide ratio in distinguishing volcanic soil weathering intensity in subtropical region	4
Stakeholders' point of view on access to soil knowledge in France. What are the opportunities for further improvement?	4
Assessing soil corrosivity along feral-proof fencing in the Australian Arid Zone and the development of a new soil corrosivity index	4
A comparison of country-scale subsoil predictions between a numeric and a taxonomic soil classification system	4
Mineralogical controls on the resilience of ferruginous duricrusts in coastal landscapes along Brazil's Atlantic margin: Implications for climate change adaptation	4
Interpreting the spatial distribution of soil properties with a physically-based distributed hydrological model	4
Understanding carbon sequestration, allocation, and ecosystem storage in a grassed vineyard	4
Acid sulfate soils decrease surface water quality in coastal area of West Malaysia: Quo Vadis?	3
The hidden depths of forest soil organic carbon chemistry in a pumice soil	3
Possible policies and actions to protect the soil cultural and natural heritage of Europe	3
Tillage-residues affect mineral-associated organic matter on Vertisols in northern Mexico	3