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The northernmost Polish Eemian palaeolake near Łęczyce − Stratigraphic and palaeoecological implications for a MIS 6a − MIS 5d sediment record Łęczyce附近波兰最北端的埃厄米古湖--地层学和古生态学对MIS 6a - MIS 5d沉积记录的影响
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-14 DOI: 10.1016/j.catena.2024.108314
{"title":"The northernmost Polish Eemian palaeolake near Łęczyce − Stratigraphic and palaeoecological implications for a MIS 6a − MIS 5d sediment record","authors":"","doi":"10.1016/j.catena.2024.108314","DOIUrl":"10.1016/j.catena.2024.108314","url":null,"abstract":"<div><p>We report the results of high-resolution multi-proxy studies of a 10 m thick sedimentary profile from Łęczyce, Poland. It reveals a continuous lacustrine succession from the Eemian Interglacial. On this basis, we have distinguished seven sedimentary units (U7a-U7f) and ten local palynological zones (LPAZ Lec 1 − Lec 10), revealing the evolution of the lake from the moment of dead-ice melting, through the continuous filling of the lake basin with organic mud, to the final stage of shallowing and transformation into a peat bog. This northernmost known Eemian site was investigated for the first time, therefore, the reconstructed changes in local conditions were correlated with global changes from the final phase of the penultimate glaciation through the Eemian Interglacial to the beginning of the last glaciation. The results show that the melting of dead ice blocks at this site was delayed compared to central Poland, with lacustrine processes starting as glaciolimnic sedimentation. Furthermore, the delayed start of vegetation development around the lake resulted in the absence of a <em>Pinus-Betula-Ulmus</em> E2 level. During the Eemian, local conditions were generally stable, and sedimentation took place in a relatively deep basin with well-defined epilimnion and hypolimnion zones. Climatic instability at the end of the Eemian resulted in reduced vegetation cover. During the first climatic deterioration in the Weichselian (presumably the Herning Stadial), lacustrine sedimentation was reduced and the deposition of fine-grained mineral material predominated. This was followed by the complete drying out of the lake and the development of soil formation. The subsequent climatic warming (Brørup Interstadial?) recorded in the uppermost part of the profile (U7f) was characterised by the plant community Lec 10 (<em>Carpinus-Corylus-Picea</em>) and was presumably warmer than commonly assumed. Multi-proxy studies show that the development of the lake was more similar to that of southern Scandinavia than to that of Poland.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0341816224005113/pdfft?md5=df0219651b7a2fa3fc86a27672ba699b&pid=1-s2.0-S0341816224005113-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984724","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}
引用次数: 0
Microtopographic response of tilled loess slopes during stages of water erosion development 水蚀发展阶段翻耕黄土斜坡的微地形反应
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-14 DOI: 10.1016/j.catena.2024.108309
{"title":"Microtopographic response of tilled loess slopes during stages of water erosion development","authors":"","doi":"10.1016/j.catena.2024.108309","DOIUrl":"10.1016/j.catena.2024.108309","url":null,"abstract":"<div><p>The tilled slopes in the loess region are characterized by artificial management practices that result in variations in microtopography, which serve as both the site of water erosion and a significant factor contributing to further slope erosion development. However, the response of microtopography during the process of erosion development on tilled loess slopes is unclear. In this study, artificial rainfall simulations were conducted to simulate the development of water erosion (splash erosion (SpE), sheet erosion (ShE), and rill erosion (RE)) under three slope gradients (5°, 10°, and 20°) and three tillage practices (artificial backhoe (AB), artificial digging (AD), and contour tillage (CT)) at a rainfall intensity of 60 mm h<sup>−1</sup>. The spatial correlation and heterogeneity of the microtopography were analysed using semivariogram functions and fractal dimensions. The response characteristics of microtopography during the water erosion development process on tilled loess slopes were analysed from three perspectives: microtopography factors, erosion equilibrium areas, and slope strips M-ΔDEM. The results indicated that the microtopography process data exhibited moderate to high spatial autocorrelation. There is a positive correlation between microtopographic factors and the slope gradient. Tilled slopes exhibit erosion equilibrium effects during the processes of splash erosion, sheet erosion, and rill erosion. These equilibrium effects are located in the longitudinal ranges of 700 to 1200 mm, 700 to 1300 mm, and 800 to 1100 mm, respectively. Soil erosion and deposition primarily occur in the middle and lower parts of the slope, with 70 % of the slope’s elevation changing within 10 mm, while the remaining changes can reach 25 mm. Among the three tillage practices, AB is the most susceptible to slope influences, which can lead to soil loss, and an optimal slope gradient exists for implementing AB measures. In the case of CT at a slope of 20°, ridge breaking is more likely to occur, but considering the combined effects of soil loss suppression and the difficulty in forming rills, it is recommended to prioritize CT as the preferred tillage practice among the three practices. This study can provide a theoretical foundation for understanding the mechanisms through which microtopography influences water erosion. Additionally, it can serve as a theoretical basis for calibrating parameters in soil erosion models for sloping cultivated lands.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984725","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}
引用次数: 0
Predominance of allochthonous and refractory carbon in sediments from two contrasting Mexican mangrove ecosystems 墨西哥两种截然不同的红树林生态系统沉积物中的同源碳和难分解碳的主要成分
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-14 DOI: 10.1016/j.catena.2024.108279
{"title":"Predominance of allochthonous and refractory carbon in sediments from two contrasting Mexican mangrove ecosystems","authors":"","doi":"10.1016/j.catena.2024.108279","DOIUrl":"10.1016/j.catena.2024.108279","url":null,"abstract":"<div><p>Mangroves are one of the most Blue Carbon-rich ecosystems worldwide, as they are highly efficient at storing and sequestering a large amount of organic carbon (C<sub>org</sub>). The degradation of C<sub>org</sub> inventories in mangrove sediments could cause carbon dioxide (CO<sub>2</sub>) emissions, contributing to atmospheric warming. In this study, we used Rock-Eval pyrolysis and palynofacies identification to explore the composition and sources of organic matter (OM) and the quantity and liability of C<sub>org</sub> in four <sup>210</sup>Pb-dated sediment cores from contrasting Mexican mangrove areas. The composition of terrestrial and refractory OM was similar in all cores, with variations attributed to the influence of the local river discharges on OM inputs and preservation. A progressive decrease in C<sub>org</sub> quantity and lability from 2021 to 1990 in some cores was attributed to early diagenesis. Past precipitation and river discharge events appeared to have influenced carbon accumulation and preservation: increased influx and preservation of labile C<sub>org</sub> in the sediments occurred during low river discharge and precipitation, whereas larger inputs and oxidation of refractory C<sub>org</sub> occurred during high river discharge and precipitation. Sedimentary C<sub>org</sub> stocks, assessed for 1921–2021, were primarily composed of refractory organic components, with degradation of allochthonous and autochthonous C<sub>org</sub> mainly occurring before sediment burial. Sediments acted as efficient and long-term sinks for the C<sub>org</sub> supplied to these mangroves, particularly in the context of increasing C<sub>org</sub> inputs caused by an acceleration since the 1950s in continental erosion.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0341816224004764/pdfft?md5=b5357de23469d5b2cddd742b77796949&pid=1-s2.0-S0341816224004764-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141990459","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}
引用次数: 0
Assessing the potential of multi-source remote sensing data for cropland soil organic matter mapping in hilly and mountainous areas 评估多源遥感数据在绘制丘陵和山区耕地土壤有机质图方面的潜力
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-12 DOI: 10.1016/j.catena.2024.108312
{"title":"Assessing the potential of multi-source remote sensing data for cropland soil organic matter mapping in hilly and mountainous areas","authors":"","doi":"10.1016/j.catena.2024.108312","DOIUrl":"10.1016/j.catena.2024.108312","url":null,"abstract":"<div><p>Cropland soil organic matter (SOM) is recognized as a significant carbon reservoir in terrestrial ecosystems. Digital mapping of SOM in croplands is essential for comprehending the global carbon cycle. Accurately mapping cropland SOM using multi-source remote sensing data has been effectively incorporated into prediction models across various scales. However, the impact of multi-source remote sensing data on cropland SOM mapping outcomes in hilly and mountainous regions remains insufficiently understood. In this study, Jiangyou City, located in Sichuan Province, China, was chosen as a representative example of hilly and mountainous regions. Fifteen distinct feature combinations were devised using three remote sensing variables (Sentinel-1, Sentinel-2, and Landsat-8) along with DEM data. Feature selection was conducted using the Boruta algorithm. Subsequently, the RF, SVR, Cubist, and INLA-SPDE models were adopted to create spatially detailed distribution maps of cropland SOM for the region. Additionally, an uncertainty analysis was performed on the cropland SOM mapping results. The results indicate the following: (1) The INLA-SPDE model, which integrates both data information and spatial structure, achieves the highest accuracy and the less uncertainty in cropland SOM mapping, with an R<sup>2</sup> of 0.647 and an RMSE of 4.227 g/kg. (2) Optical imagery is more important than SAR images, but their combination enhances model accuracy. Specifically, Sentinel-2 data has a significant impact cropland SOM prediction in hilly and mountainous areas, followed by Landsat-8 data. (3) The predicted spatial distribution patterns of cropland SOM by the four models show consistency, indicating lower SOM content in the southwest and higher SOM content in the central and northeast regions. This study provides valuable references for future large-scale and high-spatial cropland SOM prediction, highlighting the importance of spatial resolution for precise SOM prediction accuracy in hilly and mountainous regions.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141979956","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}
引用次数: 0
Carbon stocks in Planosols along a rainfall gradient in Northeast Brazil 巴西东北部降雨梯度上的浮土碳储量
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-12 DOI: 10.1016/j.catena.2024.108295
{"title":"Carbon stocks in Planosols along a rainfall gradient in Northeast Brazil","authors":"","doi":"10.1016/j.catena.2024.108295","DOIUrl":"10.1016/j.catena.2024.108295","url":null,"abstract":"<div><p>Planosols have sandy-textured surface horizons that abruptly cover a dense subsoil with high clay content, which usually limits drainage and influences soil moisture. Here, we investigated changes in C storage through the pedogenic horizons of soil profile, including detailed sampling of A and B horizons along a transect to cover rainfall variation (584–1130 mm year<sup>−1</sup>) and soil cover of Planosols, including dry land areas in Northeast Brazil. The soil profile located under highest precipitation and with the greatest pedogenic development (150 cm) showed the largest C stock (101.91 Mg/ha), surpassing estimates of other soil classes. In addition, our results suggest that soil cover and pedogenesis impact C storage in Planosols. An average of 64 % of C is stored in subsurface horizons that present abundant clay fraction; thus, the dynamics of subsurface soil organic carbon (SOC) appear to be more controlled by soil features than by climate. Values of δ<sup>13</sup>C indicated the predominance of C3 plant, except in area with sugarcane cultivation (C4 plant). Changes in C distribution within the horizon suggest changes in degree of decomposability of soil organic matter (SOM), mainly in A1 and B1 layers, with A horizon richer in labile compounds. δ<sup>15</sup>N values indicated that N dynamics differ in the gradient. The thermal analyses showed that around 70 % or more of humin fraction is composed of structures more resistant to degradation, suggesting that C stock in Planosols has relative stability. However, in driest part of the climate transect, SOM may be more vulnerable to losses due to the large relative quantity of aliphatic groups in soil surface and subsurface. This work provides insights into the mechanisms the determine C storage distribution in tropical Planosols and contributes to appropriate use and management of these soils to ensure the valuable ecosystem service of C storage.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141979957","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}
引用次数: 0
Climate change dominated runoff change in the eastern Tibetan Plateau 气候变化主导青藏高原东部径流变化
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-12 DOI: 10.1016/j.catena.2024.108304
{"title":"Climate change dominated runoff change in the eastern Tibetan Plateau","authors":"","doi":"10.1016/j.catena.2024.108304","DOIUrl":"10.1016/j.catena.2024.108304","url":null,"abstract":"<div><p>Quantitatively identifying the impact of climatic and underlying surface condition changes on runoff is crucial for the efficient utilization of water resources and understanding hydroclimatic variability processes. This study aims to employ both Grid-RCCC-WBM model and Fu’s equation based on Budyko hypothesis to quantitatively analyze the spatial patterns of runoff changes, driving forces, and upstream–downstream relationships in ten typical basins across the eastern Qinghai-Tibet Plateau (<em>QTP</em>) for the first time. Breaks for Additive Season and Trend method was used to detect breakpoints in runoff series and both hydrological model and Budyko equation categorized driving forces of runoff change into change in climatic (including precipitation and potential evaporation) and underlying surface conditions. The results indicated (i) significant abrupt changes in the runoff time series around 1998, with runoff increasing in all basins except for the source region of the Yellow River. (ii) significant upstream–downstream differences in the trend and magnitude of runoff changes between breakpoints in the Yangtze and Lancang Rivers over the past 20 years, and (iii) significant runoff response to climate variability after the breakpoints in the source region of the Yangtze and Yellow river. Our findings revealed that, contrary to the backdrop of decreasing precipitation, the upstream basins maintained increasing runoff relying on permafrost and glacier meltwater, while the downstream basins exhibited decreasing trend. The differences in runoff changes after the detected breakpoints were dominated by changes in underlying surface conditions, with the highest contribution rates observed in the Dajin (494 %), Lanzhou (398%), and Tangnaihai (197%) basins. This study involved both spatial pattern and upstream–downstream relationship of runoff change that can be widely applied to other large-scale regions and especially holds important implications for the scientific and rational utilization of water resources in the <em>QTP</em>.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141979958","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}
引用次数: 0
Formation and degradation of textural pedofeatures in soils of ancient tropical coastal plains in southeastern Brazil 巴西东南部古老热带沿海平原土壤纹理特征的形成与退化
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-12 DOI: 10.1016/j.catena.2024.108313
{"title":"Formation and degradation of textural pedofeatures in soils of ancient tropical coastal plains in southeastern Brazil","authors":"","doi":"10.1016/j.catena.2024.108313","DOIUrl":"10.1016/j.catena.2024.108313","url":null,"abstract":"<div><p>Textural features in soils are defined as having a distinct granulometric composition compared to the surrounding groundmass. Among these, clay coatings are found in various pedo-environments, covering a range of climatic conditions, from wetter regions to semiarid areas. This study aimed to understand how textural features in ancient coastal plain soils can reveal mechanisms of their pedogenetic evolution and how this relates to environmental transformations. Three soil profiles were studied at different points in a toposequence, representing the upper, middle, and lower thirds. The study area is located in the municipality of Seropédica, in the state of Rio de Janeiro, southeastern Brazil. Morphological, physical, chemical, mineralogical, and micromorphological analyses were conducted on the selected profiles. Acrisols, formed in free-draining conditions, were later transformed into Planosols due to base level oscillation and the percolation of brackish solutions through the soils. The pedogenetic model proposed in this study involves the following stages: i) Clay formation by in situ mineral weathering, mainly of phyllosilicates, with pseudomorphization of the structures. ii) Destruction of the pseudomorphized structures by pedoplasmation with proximal migration of clay and genesis of textural features of coating and filling. iii) Partial and episodic saturation of the base of the profile with solutions enriched in sodium of a fluvial-marine nature. iv) Dispersion of the clays, leading to the destruction of the textural features and soil micromass, accompanied by relative sand enrichment and E horizon formation. v) Local lowering of the surface and smoothing of the base of the slopes. This transformation model is unprecedented for the southeastern region of Brazil, increasing the evolutionary complexity of soil genesis in areas of ancient fluvial-marine plains.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946362","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}
引用次数: 0
Mixed Eucalyptus plantations enhance soil organic carbon accumulation and chemical stability through soil microbial community and multifunctionality 桉树混交种植通过土壤微生物群落和多功能性提高土壤有机碳积累和化学稳定性
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-12 DOI: 10.1016/j.catena.2024.108315
{"title":"Mixed Eucalyptus plantations enhance soil organic carbon accumulation and chemical stability through soil microbial community and multifunctionality","authors":"","doi":"10.1016/j.catena.2024.108315","DOIUrl":"10.1016/j.catena.2024.108315","url":null,"abstract":"<div><p>Forest conversion can impact soil organic carbon (SOC) fixation and ecosystem functions. The newly proposed “evenness of SOC chemical components” index can indicate the permanence of stored SOC during environmental disturbances. However, how the mixing of tree species impacts SOC accumulation and persistence and changes in soil microbial communities and multifunctionality remain unknown. Thus, we conducted a field experiment (11 years) of monospecific <em>Eucalyptus urophylla</em> × <em>E</em>. <em>grandis</em> plantation for evaluating the influences of the mixed planting of a non-nitrogen (N)-fixing tree, <em>Castanopsis hystrix</em>, and an N-fixing tree, <em>Dalbergia odorifera</em>, on SOC accumulation and chemical stability. Compared with pure plantations, mixed <em>Eucalyptus</em> plantations (particularly those mixed with D. <em>odorifera</em>) exhibited significantly increased SOC concentrations by 28.60–33.71 % and increased SOC chemical component evenness by 3.96–4.67 % (<em>P</em> &lt; 0.05). We also found that the concentrations and chemical component evenness of SOC were strongly linked with litter quality, soil N, phosphorus and their availability, multifunctionality, microbial activity, carbon use efficiency (CUE), biomass, diversity, and network complexity. Furthermore, tree species mixing increased litter quality, soil nutrient availability, microbial biomass, activity, diversity, CUE, and network complexity. Soil microbial anabolism, community characteristics and multifunctionality influenced the SOC concentrations and SOC chemical components evenness. Specifically, microbial diversity enhanced the concentrations and chemical component evenness of SOC by increasing network complexity and soil multifunctionality. These findings revealed differential responses and mechanistic controls of SOC accumulation and chemical stability in different <em>Eucalyptus</em> planting patterns. Overall, mixed plantations, particularly those in which N-fixing species were introduced, effectively improved SOC accumulation and stabilization by positively altering soil quality and microbial properties, potentially representing a sustainable forestry management strategy to improve soil C benefits and multifunctionality in forest ecosystems.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141979955","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}
引用次数: 0
Topography and drainage effects on loess-derived fragipan horizon morphology, physical and chemical properties in western Kentucky and USA 地形和排水对美国肯塔基州西部黄土衍生脆片地层形态、物理和化学特性的影响
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-11 DOI: 10.1016/j.catena.2024.108274
{"title":"Topography and drainage effects on loess-derived fragipan horizon morphology, physical and chemical properties in western Kentucky and USA","authors":"","doi":"10.1016/j.catena.2024.108274","DOIUrl":"10.1016/j.catena.2024.108274","url":null,"abstract":"<div><p>The fragipan horizon is a common diagnostic soil horizon globally and is found throughout the eastern United States. Fragipans form in a range of transported parent materials and at multiple topographic/landscape positions. Typically, topographic influence on fragipan horizon morphology is related to drainage class, but these relationships remain uncertain. We investigated the influence of topography on fragipan morphology, physical properties, and extractable metals, with a focus on extractable silicon (Si) concentration, in seven loess-derived pedons in western Kentucky. We expanded this local data set with a regional synthesis of available literature to assess the influence of landscape position and USDA drainage class on the soil properties of loess-derived fragipan horizons from the Ohio and lower Mississippi River valleys. In western Kentucky, we found that fragipan prism diameter correlated with site elevation (ρ = -0.7) and slope (ρ = 0.7). We also found that dithionite extractable Si (Si<sub>d</sub>) and ratios of Si<sub>d</sub> to dithionite extractable aluminum (Al<sub>d</sub>) and iron (Fe<sub>d</sub>) positively correlated with loess thickness (ρ = 0.71–0.90). The regional data synthesis indicated that landscape position also has a significant influence on properties of fragipan horizons such as: soil texture, bulk density, pH, oxalate extractable Fe, and dithionite extractable Si molar ratios. We also observed differences in soil texture, Si<sub>d</sub>, and Si<sub>d</sub>/Al<sub>d</sub> and Si<sub>d</sub>/Fe<sub>d</sub> between fragipan horizons of different drainage classes, with moderately well drained fragipans exhibiting greater Si<sub>d</sub>. This was consistent with the hypothesis that fragipan horizons with frequent wet-dry cycles would support greater accumulation of Si. Across landscape positions and drainage classes, Si<sub>d</sub>/Al<sub>d</sub> and Si<sub>d</sub>/(Si + Al<sub>d</sub>) were not consistent which may complicate the use of these ratios as metrics for fragipan horizons. In the loess-derived fragipans of the central US, topography and drainage exerted significant influence on fragipan properties and must be considered when addressing fragipan genesis.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946366","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}
引用次数: 0
A comprehensive approach to soil burn severity mapping for erosion susceptibility assessment 用于侵蚀易发性评估的土壤烧伤严重程度绘图综合方法
IF 5.4 1区 农林科学
Catena Pub Date : 2024-08-11 DOI: 10.1016/j.catena.2024.108302
{"title":"A comprehensive approach to soil burn severity mapping for erosion susceptibility assessment","authors":"","doi":"10.1016/j.catena.2024.108302","DOIUrl":"10.1016/j.catena.2024.108302","url":null,"abstract":"<div><p>Burn severity maps are typically generated using spectral indices and used in classifying the spatial distribution of damage caused by fires. In densely vegetated forests, even when overstory crowns are severely affected by the high-intensity fire, the topsoil may not experience high temperatures which makes spectral indices inadequate for assessing soil burn severity. On the other hand, field observations of soil burn severity can be subjective. For this reason, horizon-based soil sampling and extensive soil testing (physical, hydrological, chemical, mineralogical, and mechanical properties) were conducted in this study. Statistical tests have been employed to identify the most representative soil parameters of soil burn severity in the area. The remote sensing data (differential spectral indices and land surface temperature), field observations, and site-specific burned soil data were combined through weighted overlay analysis in the Geographical Information System (GIS). Accordingly, an improved soil burn severity map for the area affected by a forest fire in Kavaklıdere, Muğla, Türkiye was produced to show the post-fire soil erodibility potential. The findings of this study indicated that the effect of fire on soil properties was limited to the upper 0–4 cm of the soil profile with surface temperatures reaching a maximum of 300 °C for the high burn severity. The liquid limit, shear strength, organic matter, water repellency, and mean grain size were determined to be promising parameters to represent the soil burn severity. The map produced using the novel approach outperformed conventional burn severity maps. In addition, the high soil burn severity class can serve as a parameter to indicate erosion susceptibility after a wildfire.</p></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946360","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}
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