Geoderma Regional最新文献

{"title":"Effects of tree species composition in plantation forest on soil aggregate stability and organic carbon pools in northeastern China","authors":"Changzhun Li,&nbsp;Qingcheng Wang,&nbsp;Huirong Wu,&nbsp;Yong Zhang,&nbsp;Shuangjiao Ma,&nbsp;Liqing Xu","doi":"10.1016/j.geodrs.2024.e00899","DOIUrl":"10.1016/j.geodrs.2024.e00899","url":null,"abstract":"<div><div>Forest tree species composition influences soil aggregate stability (SAS) and labile organic carbon (LOC) components, which may affect soil organic carbon (SOC) sequestration. Despite the general belief that mixed forests enhance SOC storage, evidence suggests that certain monocultures may outperform mixed forests. Therefore, information on the specific impact of tree species mixing on SOC through SAS and LOC remains limited. This study aimed to investigate the effects of tree species composition on SAS and LOC in 49-year-old monoculture (<em>Larix gmelinii</em> (Lg), <em>Pinus koraiensis</em> (Pk)) and mixed conifer-broadleaf (<em>Larix gmelinii - Fraxinus mandshurica</em> (LF), and <em>Pinus koraiensis - Populus ussuriensis</em> (PP)) stands, and its impact on SOC sequestration. We measured SAS indices (including mean weight diameter (MWD), geometric mean diameter (GMD), and &gt; 0.25 mm water stable aggregate proportion (WSA)), SOC storage, and LOC components (easily oxidized organic carbon (EOC), microbial biomass carbon (MBC), and dissolved organic carbon (DOC)) in 0–40 cm soil horizons during the growing season (June, August, and October). Our results showed that tree species composition significantly influenced SAS and SOC components, with the highest SAS found in the 0–20 cm soil horizon in Pk and PP forests (<em>p</em> &lt; 0.05) (Jun.: MWD _Pk: 0.98, GMD _Pk: 1.88, WSA _Pk: 1.79, MWD _PP: 0.98, GMD _PP: 1.90, WSA _PP: 1.81; Aug.: MWD _Pk: 0.99, GMD _Pk: 1.85, WSA _Pk: 1.77, MWD _PP: 0.99, GMD _PP: 1.89, WSA _PP: 1.81; Oct.: MWD _Pk: 0.98, GMD _Pk: 1.86, WSA _Pk: 1.76, MWD _PP: 0.97, GMD _PP: 1.83, WSA _PP: 1.73) and the highest SOC components in the LF stand (<em>p</em> &lt; 0.05) (soil horizon 0–20 cm: Jun.: SOC: 110.23 g/kg, EOC: 92.81 g/kg, MBC: 1418.39 mg/kg, DOC: 1090.01 mg/kg; Aug.: SOC: 108.46 g/kg, EOC: 79.57 g/kg, MBC: 1369.91 mg/kg, DOC: 1316.11 mg/kg; Oct.: SOC: 109.78 g/kg, EOC: 44.37 g/kg, MBC: 1782.6 mg/kg, DOC: 671.05 mg/kg). Correlation analysis revealed significant relationships between SOC and LOC components (<em>p</em> &lt; 0.05, r _EOC = 0.43, r _MBC = 0.46, r _DOC = 0.17) but not associated with SAS (<em>p</em> &gt; 0.05, r _MWD = −0.07, r _GMD = −0.07). Tree species composition in plantation stands significantly affects SAS and SOC pools. In conclusion, the positive effect of mixed coniferous and broad-leaved forests on SAS and SOC pools is also contingent upon the tree species identity. The results suggest that targeted selection of tree species could better enhance SAS and SOC pools in plantation than a mere increase in species richness.</div></div>","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00899"},"PeriodicalIF":3.1,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 “Geochemistry and microbiology of boreal alluvial soil under salinization” [Geoderma Regional 38 (2024) e00842]","authors":"E.A. Khayrulina ,&nbsp;N.V. Mitrakova ,&nbsp;A.Yu. Maksimov ,&nbsp;P.Yu. Maltseva ,&nbsp;A.A. Bogush","doi":"10.1016/j.geodrs.2024.e00883","DOIUrl":"10.1016/j.geodrs.2024.e00883","url":null,"abstract":"","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00883"},"PeriodicalIF":3.1,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transitioning to soil health and carbon sequestration with agroforestry and perennial crop systems","authors":"M. Oelbermann ,&nbsp;S.X. Chang ,&nbsp;M. Pulleman ,&nbsp;J.K. Whalen","doi":"10.1016/j.geodrs.2024.e00895","DOIUrl":"10.1016/j.geodrs.2024.e00895","url":null,"abstract":"","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00895"},"PeriodicalIF":3.1,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predicting soil properties for fertiliser recommendation in South Korea using MIR spectroscopy","authors":"Sang Ho Jeon ,&nbsp;Ho Jun Jang ,&nbsp;Wartini Ng ,&nbsp;Budiman Minasny ,&nbsp;Seong Heon Kim ,&nbsp;Jay Hong Shim ,&nbsp;Ahnsung Roh ,&nbsp;Soon ik Kwon ,&nbsp;Jin-Ju Yun","doi":"10.1016/j.geodrs.2024.e00901","DOIUrl":"10.1016/j.geodrs.2024.e00901","url":null,"abstract":"<div><div>The national fertiliser policies in South Korea aim to provide guidance to farmers for efficient fertiliser application and thus rely on the annual collection and analysis of soil samples. Providing timely soil analysis results remains a challenge, as wet laboratory analysis is time-consuming and expensive. This study represents a pioneering effort in South Korea, by investigating mid-infrared (MIR) spectroscopy for accurate soil properties prediction and its application in developing fertiliser recommendations for several crop types. Additionally, we examined the time efficiency of MIR spectroscopy compared to conventional analytical methods. A total of 567 soil samples from diverse soil and land use types (paddy, upland, orchard, and greenhouse fields) in South Korea (0–20 cm depth) were collected and scanned using an MIR spectrometer. Four machine learning algorithms (partial least squares regression, support vector machine, cubist, and random forest) were trialled and compared for their prediction accuracies using 15-fold cross-validation for eight essential soil properties: organic matter, total nitrogen (N), available phosphorus (P), pH, exchangeable calcium (Ca), potassium (K), magnesium (Mg), and available silica. Results demonstrated robust predictive performance (R² &gt; 0.70) across the selected soil properties, with organic matter and total nitrogen exhibiting excellent accuracy (R² &gt; 0.9). Compared with conventional analysis, the average difference in fertiliser application recommendation for seven crops using MIR prediction was 3.8 % for N, 13.9 % for P and 8.1 % for K. Based on the measurement of 11 soil properties, analysis using MIR spectroscopy was about 12 times faster than conventional methods. The study demonstrates the potential of this approach to revolutionise soil analysis protocols, offering a more efficient and cost-effective solution for sustainable agricultural practices in South Korea.</div></div>","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00901"},"PeriodicalIF":3.1,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Smectite-rich horizons in Inceptisols trigger shallow landslides in tropical granitic terranes","authors":"P.C. Ryan ,&nbsp;D. Mahmud ,&nbsp;K.L. Derenoncourt ,&nbsp;L.F. Nerbonne ,&nbsp;I.L. Pérez-Martín ,&nbsp;J. Reyes Collovati ,&nbsp;M. Junaid ,&nbsp;C. Cerovski-Darriau","doi":"10.1016/j.geodrs.2024.e00897","DOIUrl":"10.1016/j.geodrs.2024.e00897","url":null,"abstract":"<div><div>Puerto Rico was affected by &gt;70,000 landslides in the wake of 2017 Hurricane Maria, and landslide prevalence was especially high in the Utuado region in the Cordillera Central. Landslide density was highest where soil parent material is granodiorite; landslide slip surfaces tended to be shallow (&lt;60 cm), and often were mobilized rapidly and with long runout distances. This study combines field observations with soil mineralogy (bulk and clay fractions), soil geochemistry (bulk fraction), and soil strength as determined by field cone penetrometer testing (CPT) to test the hypothesis that clay-rich subsoil horizons function as slip planes when water-logged. Soil pits were excavated to depths of ∼200 cm in Ultisols on an undulating plateau and to ∼100 cm in Inceptisols on steep slopes (36-43^o) that flank the plateau and cone penetrometer tests (CPT) were done within 2 m of the soil pit. Six pits were located adjacent to scarps from previous landslides, enabling analysis of soil profiles downward through extrapolated slip surfaces. Results from X-ray diffraction (XRD), X-ray fluorescence (XRF) and thermogravimetric analysis (TGA) indicate that soils are heterogeneous, often with subsoil horizons enriched in clay minerals and immobile elements (Al, Fe, Ti). Inceptisols on steep slopes often contain smectite-rich horizons at 30–60 cm depth that appear to function as slip surfaces; in other Inceptisols, such horizons are not present and landslide susceptibility is potentially lower. In Ultisols, soil mineralogy is dominated by kaolinite with minor halloysite, and increased kaolinite content at soil depths ≥80 cm at some sites suggests potential slip surfaces enhancing probability of landslides. The origin of clay-rich horizons appears to be (1) fractures in granodiorite that facilitate water flow and leaching, accelerating mineral dissolution during early weathering stages, and (2) smectite-rich buried soils under permeable colluvium likely deposited by a prior mass wasting event. Where clay-rich layers occur beneath more-permeable horizons, rapid infiltration then absorption of water in clay-rich subsoil horizons causes decreased shear strength and increased landslide susceptibility.</div></div>","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"40 ","pages":"Article e00897"},"PeriodicalIF":3.1,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143144977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The amendment value of pulp and paper mill sludges in Finnish coarse-textured soil","authors":"Mari Räty ,&nbsp;Maarit Termonen ,&nbsp;Juha Hyvönen ,&nbsp;Jaana Uusi-Kämppä ,&nbsp;Kirsi Järvenranta ,&nbsp;Helena Soinne ,&nbsp;Johanna Nikama ,&nbsp;Kimmo Rasa ,&nbsp;Mikko Järvinen ,&nbsp;Riikka Keskinen","doi":"10.1016/j.geodrs.2024.e00894","DOIUrl":"10.1016/j.geodrs.2024.e00894","url":null,"abstract":"<div><div>As a source of exogenous organic matter, pulp and/or paper mill sludges (PPMS) may have beneficial effects on crop productivity and soil chemical and physical properties. This study's aim was to assess the impacts of two different PPMS materials on crop yields, the quality of percolation water, and soil chemical and hydraulic properties in a three-year field experiment on a silt loam soil in East Central Finland. Fresh (FPMS) and lime-stabilized (LPMS) sludges were applied once at rates of 21–28 fresh-Mg ha⁻¹ in the spring prior to the sowing of grass ley under barley as a cover crop and incorporated into the upper 7 cm soil layer. Supplemental nitrogen (N) was applied at levels of 40 and 80 kg ha⁻¹. A decrease of barley grain yield due to N immobilization was observed at the N level 40 kg ha⁻¹, but the standard N application rate (80 kg ha⁻¹) connected with a moderate C:N ratio (FPMS 27:1, LPMS 24:1) was adequate to avoid significant yield losses. In the second and third year following the PPMS applications, there was a tendency for positive residual effects on the total dry matter yield of grass ley, which could be attributed to slow mineralization of sludge-N. The application of LPMS increased the pH in surface soil by 0.5–0.7-units and Ca concentration by 240–660 mg L⁻¹ of soil relative to the non-amended control over the study period. In the year of PPMS applications, the amendments produced a significant increase (about 2.0 g kg⁻¹) in the total carbon (C) concentrations in the uppermost 10 cm soil layer relative to the non-amended soil. During the following years, the change in soil C was no longer measurable, indicating relatively fast decomposition of sludge-C. Saturated hydraulic conductivity tended to be 1.4 to 2.3 times higher in the PPMS-treated soils than in the non-amended soil. Except for the decline in readily plant-available water, the other common water retention parameters were not significantly affected by the PPMS amendments. There were significant positive treatment effects on the amount of water retained between −13 and − 316 kPa matric potentials, suggesting an increase in medium-sized pores contributing to water storage in the soil. To maintain or enhance the beneficial direct and indirect effects of PPMS on crop yields and soil physico-chemical properties, repeated applications of PPMS are required, possibly combined with the use of organic fertilizers, especially during grass ley years.</div></div>","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00894"},"PeriodicalIF":3.1,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Soil organic carbon to clay ratio in different pedoclimatic and agronomic conditions in northeastern North America","authors":"I. Chahal ,&nbsp;J.P. Amsili ,&nbsp;D.D. Saurette ,&nbsp;J.A. Bower ,&nbsp;A.W. Gillespie ,&nbsp;H.M. van Es ,&nbsp;L.L. Van Eerd","doi":"10.1016/j.geodrs.2024.e00893","DOIUrl":"10.1016/j.geodrs.2024.e00893","url":null,"abstract":"<div><div>Soil organic carbon levels are strongly influenced by pedoclimatic and agronomic environments; hence, establishing universal threshold values for SOC to differentiate soils into healthy and degraded classes is nearly impossible. Previously, SOC:clay ratio thresholds were used to classify soils into categories of “degraded”, “moderate”, “good”, and “very good”. Here, by comparing the percentage of soils under these categories, we assessed the applicability of the SOC:clay ratio as an indicator of soil carbon status on 2249 soil samples collected from Ontario (Canada) and New York (USA). Our results confirmed that the classification of soil based on SOC:clay ratio was highly clay biased, inaccurate, and not a true representation of soil degradation status. Fine-textured soils had a high percentage of degraded soils (73 %) whereas coarse textured soils had a large percentage (62 %) of soils with “very good” soil carbon status. Therefore, we do not recommend using SOC:clay ratio as a metric to assess soil carbon or degradation status. Alternatively, as originally proposed by <span><span>Poeplau and Don (2023)</span></span>, we tested a ratio between actual and expected SOC levels (SOC:SOCexp) as an indicator of soil degradation. Linear regression between SOC and clay content for the pasture systems was used to calculate SOCexp. Our results confirmed that classification of soil based on the SOC:SOCexp ratio was less biased, independent of clay content, and had a positive relationship soil health indicators (aggregate stability, permanganate oxidizable carbon (POXC), pH). Furthermore, we found that SOC:SOCexp better differentiated between soil degradation classes for all the tested soil physical, chemical, and biological properties than SOC:clay. While SOC:SOCexp was found to be a better predictor of soil carbon status than SOC:clay, the SOC:SOCexp thresholds were based on our dataset (a small sample size relative to population) and would not be appropriate across pedo-climatic zones. Overall, we conclude that SOC:clay is not an effective indicator of soil carbon status and SOC:SOCexp might be more useful to assess soil condition and derive baseline soil carbon levels at a regional scale.</div></div>","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00893"},"PeriodicalIF":3.1,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Exploring the physical properties of Australian alpine soils to inform ecosystem restoration","authors":"Sarah Treby ,&nbsp;Susanna Venn ,&nbsp;Samantha Grover","doi":"10.1016/j.geodrs.2024.e00896","DOIUrl":"10.1016/j.geodrs.2024.e00896","url":null,"abstract":"<div><div>Alpine soils are globally threatened and are particularly vulnerable to the impacts of climate change. In Australia, development and grazing put further pressure on alpine ecosystems. Consequently, land managers and restoration practitioners are increasingly interested in understanding how to tailor revegetation approaches to enhance their success in mountain environments. Because of the intrinsic role of soils in plant-water relationships, the aim of this study was to quantify and compare the physical and hydraulic properties of soils in the Australian Alps. We investigated four common soils that occur across the Australian Alps bioregion: peat soils (organosols), alpine humus soils, skeletal mountaintop soils, and disturbed soils (anthroposols). We quantified and compared soil bulk density, particle density, porosity, water content, infiltration, hydraulic conductivity, and wilting point between soils. We found significant differences in soil properties both within and among each soil, highlighting the importance of understanding local edaphic conditions to improve revegetation outcomes. We recommend that direct measurements of plant establishment, growth, and survival are linked with soil physical, chemical, and hydraulic properties in future research, to build upon these findings.</div></div>","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00896"},"PeriodicalIF":3.1,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Wind erosion escalation in western Slovakia driven by climate and land use and land cover shifts","authors":"Nikseresht Fahime ,&nbsp;Lackoóvá Lenka ,&nbsp;Yousefi Saleh","doi":"10.1016/j.geodrs.2024.e00892","DOIUrl":"10.1016/j.geodrs.2024.e00892","url":null,"abstract":"<div><div>Wind erosion is a major cause of soil degradation and air pollution and is influenced by climate and land use factors. Understanding the mechanisms behind wind erosion dynamics is crucial for mitigating its harmful effects. This study employs an integrated approach, combining the Analytic Hierarchy Process (AHP) methodology and local knowledge, to comprehensively assess wind erosion in the western region of Slovakia from 2001 to 2021. Using GIS-based AHP, the study assessed the spatial distribution of areas at high risk of wind erosion based on six parameters: wind speed, surface dryness, land use, land cover, soil texture, and field slope. A multicollinearity test was conducted to examine the collinearity of the chosen factors, and it was seen that none of the factors were compromised by multicollinearity. The results showed a significant increase in the risk of wind erosion in the study area over the past 20 years, with very high erosion risk in 2007, 2014, and 2021 increasing by 37 %, 86 %, and 128 %, respectively, compared to 2001. Statistical analyses confirm the significant impact of surface dryness, wind speed, land use, and land cover on wind erosion, emphasizing the need for targeted strategies to mitigate erosion risk. The regression analysis underscores the negative relationship between land use and wind erosion, emphasizing the pivotal role of land management in erosion prevention. These findings contribute valuable insights to the discourse on sustainable land use practices and erosion mitigation, particularly in the context of evolving climate dynamics.</div></div>","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00892"},"PeriodicalIF":3.1,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142650975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Content and quality of soil organic matter in topsoils under different tundra vegetation in central Spitsbergen (High Arctic)","authors":"Anna Bartos,&nbsp;Mateusz Stolarczyk,&nbsp;Wojciech Szymański","doi":"10.1016/j.geodrs.2024.e00891","DOIUrl":"10.1016/j.geodrs.2024.e00891","url":null,"abstract":"<div><div>Permafrost-affected soils contain a large amount of soil organic matter (SOM) which may become easily available to microbial decomposition due to climate warming. Despite numerous studies conducted on SOM in permafrost-affected soils, our knowledge about its quantity and chemistry requires further enhancement in the central part of Spitsbergen, due to a lack of detailed studies in this area. Especially, very little is known about the link between soil and vegetation in the High Arctic region. The main aim of this study was to determine the quantity and chemistry of SOM in the topsoil horizons of permafrost-affected soils covered with different tundra vegetation types in the vicinity of Longyearbyen (central Spitsbergen). Four types of tundra (pioneer tundra, arctic meadow, wet moss tundra, and heath tundra) were selected for this study. The obtained results indicate that the highest mean content of total organic carbon (TOC, 24.22 %) and total nitrogen (TN, 0.79 %) occurred in topsoils covered with heath tundra, while clearly lower mean contents of TOC and TN were noted in topsoils under wet moss tundra (5.96 %, 0.37 %, respectively), arctic meadow (3.40 %, 0.19 %, respectively), and pioneer vegetation (2.56 %, 0.21 %, respectively). The obtained FTIR-ATR spectroscopy results indicated significant differences in the chemical composition of SOM under different types of tundra. The highest mean value of the aromatic C/aliphatic C ratio (1632/2928 ratio) was noted for topsoils covered with arctic meadow (2.82). On the other hand, the lowest mean value of aromatic C/aliphatic C ratio for SOM was obtained for topsoils covered with heath tundra (0.81). This indicated that SOM in topsoils under heath tundra vegetation is characterized by a higher content of aliphatic compounds in relation to aromatic compounds. Moreover, both soil texture and soil pH significantly affected the content and quality of SOM in the studied topsoils.</div></div>","PeriodicalId":56001,"journal":{"name":"Geoderma Regional","volume":"39 ","pages":"Article e00891"},"PeriodicalIF":3.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}