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{"title":"Aridity regulates the vital drivers of soil organic carbon content in the Northeast China","authors":"Huiying Wen ,&nbsp;Zheng Sun ,&nbsp;Fei Yang ,&nbsp;Ganlin Zhang","doi":"10.1016/j.catena.2025.109192","DOIUrl":"10.1016/j.catena.2025.109192","url":null,"abstract":"<div><div>The increasing prevalence of aridity events profoundly influences the terrestrial soil organic carbon (SOC) dynamics. Varying aridity conditions may induce differential effects of changing environments on SOC content. Current knowledge regarding how aridity intervenes with the key drivers of SOC remains limited, especially in complex ecosystems along aridity gradients. Here, we utilized nearly 1,000 soil samples (0–20 cm and 20–100 cm) from the Second National Soil Survey in 1980 s as the foundation. Employing machine learning methods, generalized additive model (GAM), and structural equation model (SEM), we estimated the spatial patterns of SOC in the Northeastern and elucidated the intervention of aridity on the key drivers of SOC. Our findings revealed that SOC content gradually decreased along the aridity gradient from the northeast to the southwest in both soil layers. Aridity and exchangeable Ca²⁺ were identified as the key factors controlling this pattern. Results from nonlinear analysis demonstrated a non-stationary response of SOC content to aridity. As the intensity of aridity increased, SOC content shifted from a slow decline to a rapid decrease, with numerical thresholds identified in the value space (0–20 cm, 0.48; 20–100 cm, 0.45). The range of aridity thresholds in the numerical space delineated the type boundaries of phaeozems and luvisols in geographical space. Results from SEM indicated that aridity and its critical thresholds significantly coordinated the key driving forces of SOC content. In the aridity environment beyond the threshold, with the contraction of other drivers, the controlling role of exchangeable Ca²⁺ was further amplified and consistently mediated SOC content. We emphasized the contribution of aridity to understanding of SOC driving patterns, with other drivers exhibiting different behaviors in their contributions to SOC, accompanied by differences (even thresholds). This provides an important prerequisite for further understanding the response of soil carbon pool to ecosystem environmental changes.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109192"},"PeriodicalIF":5.4,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139307","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":"Patterns and drivers of soil organic carbon fractions and persistence in coastal wetlands of China","authors":"Lele Wu ,&nbsp;Zhaoliang Song ,&nbsp;Xinyu Zhang ,&nbsp;Yuan Guo ,&nbsp;Yidong Wang ,&nbsp;Changxun Yu ,&nbsp;Yunying Fang ,&nbsp;Iain P. Hartley ,&nbsp;Ji Chen ,&nbsp;Shaopan Xia ,&nbsp;Xiaoguang Ouyang ,&nbsp;Wenhai Mi ,&nbsp;Ding He ,&nbsp;Cong-Qiang Liu ,&nbsp;Hailong Wang","doi":"10.1016/j.catena.2025.109186","DOIUrl":"10.1016/j.catena.2025.109186","url":null,"abstract":"<div><div>Coastal wetlands have disproportionately high carbon (C) sequestration rates and long-term sustainable C sequestration capacity, contributing to the mitigation of global climate change. Previous studies have mainly focused on the assessment of bulk soil organic C (SOC) in coastal wetlands, neglecting the form in which C is stored, its stability and driving factors, which hinders our in-depth understanding of C sequestration capacity and underlying mechanisms. In this study, we sampled 157 plots across coastal wetlands in China, covering tropical, subtropical, and temperate climates to gain a detailed understanding of the distribution, stability, and control mechanisms of SOC fractions. Our results showed that the SOC in the topsoil (0–10 cm) was co-dominated by mineral-associated organic C (MAOC) and particulate organic C (POC) in mudflats, temperate and subtropical salt marshes, and subtropical mangroves, but not in tropical mangroves. The content of dissolved organic C (DOC, 0.12 ± 0.08 g kg⁻¹) was only 1.15 ± 0.06 % of bulk SOC. The POC became more dominant relative to MAOC and DOC as SOC content increased. We found that soil properties (total nitrogen, bulk density, and particle size, etc), were the primary explanatory variables for SOC fractions content and persistence, accounting for 58 %, 64 %, 38 %, 53 %, and 34 % of total variation in MAOC, POC, DOC, MAOC/SOC, and C/N, respectively. Although climate and vegetation factors did not directly control C contents in soil matrix and persistence, they interacted strongly with edaphic variables explaining 8 %, 16 %, 11 %, 12 %, and 13 % of the total variation in the above variables, respectively. Our results suggest that the increase in SOC, especially POC, reduced its persistence, so the implementation of C management strategies in coastal wetlands should integrate SOC sequestration and stability to maximize benefits.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109186"},"PeriodicalIF":5.4,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139306","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":"Annual variation in sediment connectivity in karst watersheds of southwest China","authors":"Si Cheng ,&nbsp;Xingxiu Yu ,&nbsp;Zhenwei Li ,&nbsp;Liangxia Duan ,&nbsp;Xianli Xu ,&nbsp;Kelin Wang","doi":"10.1016/j.catena.2025.109173","DOIUrl":"10.1016/j.catena.2025.109173","url":null,"abstract":"<div><div>Sediment connectivity reflects the connectivity between sediment sources and sinks and contributes to understanding soil erosion and sediment transport processes. However, the potential effects of climatic factors and vegetation restoration on sediment connectivity have not been fully recognized, especially in the karst area of southwest China, which has a serious rocky desertification and fragile ecological environment. This study aims to quantify the connectivity index (IC), runoff, and sediment yield changes induced by the coupling impacts of climate change and vegetation restoration in six typical karst watersheds. Annual climate, vegetation, land use, soil, runoff, and sediment yield data were collected during 2000 ∼ 2019. The parameters of IC were calculated based on the source-sink landscape index. The Partial least squares structural equation model (PLS-SEM) was used to quantify the impacts of climate change and vegetation restoration on changes in IC, runoff, and sediment yield. The results show that the average IC value ranged from 2.10 to 2.97 during 2000 ∼ 2019, with an insignificant decreasing trend. PLS-SEM analysis shows that climatic and vegetation factors explained 1 ∼ 7 % of the changes in IC values and 53 %∼90 % of the runoff dynamics. Climate factors, vegetation dynamics, runoff, and IC values together explained 21 %∼67 % of the variations in sediment yield. These results can facilitate understanding the temporal variation in IC and are significant for ecological restoration and sediment delivery control in karst areas.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109173"},"PeriodicalIF":5.4,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139467","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":"Influencing mechanism of microtopography on erosion hydrodynamics on bare slopes of pika mounds in alpine meadows in the Yellow River source area, Western China","authors":"Shengchun Tong ,&nbsp;Guorong Li ,&nbsp;Xilai Li ,&nbsp;Jinfang Li ,&nbsp;Yong Li ,&nbsp;Dalin Yue ,&nbsp;Jianyun Zhao ,&nbsp;Haili Zhu ,&nbsp;Yabin Liu ,&nbsp;Wenting Chen ,&nbsp;Xiasong Hu","doi":"10.1016/j.catena.2025.109158","DOIUrl":"10.1016/j.catena.2025.109158","url":null,"abstract":"<div><div>The mound-building behavior of plateau pika is one of the important factors leading to meadow degradation and soil erosion in the Yellow River source area of Western China, but little is known about the influencing mechanism of microtopography on erosion hydrodynamic characteristics of bare slopes of pika mounds. In this study, we analyzed microtopography and erosion hydrodynamic characteristics on bare slopes of pika mounds under subrainfall conditions through simulation of rainfall events at six intensities (all lasting 60 min), and revealed the influencing mechanism of slope microtopographic changes on erosion hydrodynamics by using redundancy analysis (RDA) and structural equation modeling (SEM). The results showed that the maximum average erosion depth was 4.159 cm, and the maximum erosion areas accounted for 93.40 % of the total area of runoff plots; intense erosion took place mainly in the upper half of the pika mounds, while deposition was mainly limited to the lower half of the pika mounds. Surface flow velocity, flow regime parameters, and erosion power parameters all showed an increasing trend with rainfall intensity (P &lt; 0.05), while the resistance parameters showed a decreasing trend with rainfall intensity (P &lt; 0.05); all slope flows were laminar (<em>Re</em> &lt; 500), but transitioned from slow flows to rapid flows at a higher rainfall intensity. The RDA results showed that surface cutting degree was the key factor influencing surface runoff volume and sediment yield and hydrodynamic parameters, and that the Reynolds number could be the best hydrodynamic parameter to characterize runoff volume and sediment yield. SEM analysis showed that microtopography influenced water erosion either directly (with a path coefficient of 0.856) or indirectly through hydrodynamic characteristics (path coefficient = 0.742). This research showed that microtopography of the bare slopes had a significant effect on water erosion, and was linked to hydrodynamic characteristics to build up a highly complex dynamic exchange process.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109158"},"PeriodicalIF":5.4,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134316","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 coupled model of surface water-groundwater interaction with the effect of riverbed deformation in the alluvial channel","authors":"Linlin Li ,&nbsp;Hang Li ,&nbsp;Genguang Zhang ,&nbsp;Defu Liu ,&nbsp;Yao Xiao ,&nbsp;Ying Liu ,&nbsp;Jiahao Zou","doi":"10.1016/j.catena.2025.109193","DOIUrl":"10.1016/j.catena.2025.109193","url":null,"abstract":"<div><div>Hyporheic exchange process is a common mode of surface water-groundwater interaction, involving the transport of substances, nutrients and energy, which is an important foundation for river ecology. However, the effect of riverbed deformation driven by weir in natural rivers remains unclear. In this study, the effect of local scour pit created by low-head weirs on hyporheic exchange process was studied by the coupled model of surface water-groundwater. While many studies assume static riverbed conditions, this study integrates a dynamic surface water model that accounts for sediment transport and evolving scour pits, while employing a steady-state representation for subsurface flow to reflect the gradual adjustment of hyporheic exchange. The variation of the local scour depth, hyporheic exchange flux, hyporheic zone pressure field and temperature response area were investigated under different weir height and flow discharge. The results showed that: (a) the increasing weir height significantly enhanced hydrodynamic effect, with the morphological changes in scour pits altering the distribution of hyporheic zone pressure field and further intensifying surface water-groundwater exchange; (b) when the weir height increased from 15 cm to 25 cm, the scour pit depth increased from 9 cm to 25 cm, the volume of the local scour pit increased by approximately 3.3 times, and the hyporheic exchange flux increased to a maximum value of 0.011 m²/s; (c) the peak downwelling Darcy velocity in the hyporheic zone increased from 0.0039 m/s to 0.0067 m/s as the flow discharge increased from 0.0621 m³/s to 0.1200 m³/s; (d) the scour pit formation altered the local bed topography, then influencing the hyporheic exchange pathways and rates; the peak downwelling Darcy velocity with the riverbed scouring effect was 2.5 times higher than that of the others, with the hyporheic exchange flux increasing by 1.5 times. This study can provide theoretical insights for optimizing low-head weir designs and water management in river ecological restoration.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109193"},"PeriodicalIF":5.4,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134315","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":"Geomorphic activity and related large wood recruitment during debris flows and debris Floods: Storm Alex in the Vésubie valley (France)","authors":"Marco Martini ,&nbsp;Vincenzo D’Agostino ,&nbsp;Guillaume Piton","doi":"10.1016/j.catena.2025.109180","DOIUrl":"10.1016/j.catena.2025.109180","url":null,"abstract":"<div><div>Extreme floods in forested catchments cause geomorphic changes and large wood recruitment, worsening flood hazards. The study examines the geomorphic response and large wood recruitment in the Vésubie River catchment (392 km², southeast France) during Storm Alex in October 2020. Using high-resolution LiDAR-derived DEM, the research quantifies geomorphic changes in the main branches and 43 active tributaries, estimating sediment mobilization and channel dynamics at (sub-)catchment and 100-meter reach scales. Forest cover changes were analyzed by comparing pre- and post-event canopy height models (CHM), allowing for the estimation of large wood recruitment. The results show significant geomorphic changes, with extreme erosion and deposition rates observed at both the (sub-)catchment and reach scales. A total forest cover loss of 121 ha was estimated, with recruited large wood volumes per unit of catchment surface ranging from 4<!--> <!-->–<!--> <!-->445 m³/km² in the tributaries and 45<!--> <!-->–<!--> <!-->95 m³/km² in the main branches. A positive correlation was identified between forest cover loss and both erosion and deposition rates, suggesting that forest loss resulted from trees being scoured by erosion or buried by deposition. An empirical approach was developed to predict forest cover loss based on total sediment mobilization by implementing different equations for optimistic, intermediate, and catastrophic scenarios. The research highlights the interconnected nature of geomorphic processes and their role in large wood dynamics. The findings provide valuable insights into large wood recruitment and the impact of intense geomorphic activity on channel dynamics, demonstrating complex and tight interactions between sediment transport, forest cover, and flood hazards in mountain catchments.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109180"},"PeriodicalIF":5.4,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123605","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":"Pedological features affecting carbon accumulation in submerged-soils sequence assessed with Vis-NIR spectroscopy in a coastal wetland in Albania","authors":"Adri Erebara ,&nbsp;Albert Kopali ,&nbsp;Seit Shallari ,&nbsp;Erika Di Iorio ,&nbsp;Alessio Manzo ,&nbsp;Elettra Longobardi ,&nbsp;Pasquale Napoletano ,&nbsp;Anna De Marco ,&nbsp;Claudio Colombo","doi":"10.1016/j.catena.2025.109187","DOIUrl":"10.1016/j.catena.2025.109187","url":null,"abstract":"<div><div>The sequestration of SOC in submerged soils depends on the anaerobic conditions and vegetation types. In this context, soil spectroscopy is an accurate and reproducible method to estimate SOC in the visible and near infrared region. The aim of this research was to quantify the SOC fraction in wetland soils using soil spectroscopy and, subsequently, to try and establish a relation of different carbon fractions with soil pedological features. A transect of 17 pedons was sampled to analyze pedological features that affect carbon accumulation and decarbonation processes in the Kune Vaini lagoon system in Albania. The organic and inorganic C pools were analyzed using dry combustion, with a CNS analyser to determine total organic carbon (TOC), and with a furnace to determine loss on ignition (LOI) at 350 and 450 °C. Vis-NIR spectra were analysed using two regression models (PLSR and SVMR) that were calibrated and validated to obtain a valuable prediction for soil C fractions. Results indicated that the difference of soil organic matter (SOM), estimated with CNS and LOI, can be considered to represent the SOM that is strongly resistant to mineralisation. The SOM from LOI450 was considered to have more resistant forms of organic C, in spite of the more labile and degradable ones (TOC, LOI350). Models derived from PLSR had slightly higher RPD values compared to the results obtained from the SVM regression modelling for all C fractions and for carbonate, EC, BD, and pH. This study showed that the use of visible near infrared spectroscopy coupled with the PLSR model allowed for the accurate prediction of LOI, TOC, CaCO₃, BD, EC, and pH of submerged soils. The PLSR model can be applied in estimating different carbon contents under submerged conditions to get a deeper understanding of carbon accumulation in wetland soil ecosystems.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109187"},"PeriodicalIF":5.4,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123606","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":"An early warning model for desiccation-induced cracking of clay based on OFDR monitoring","authors":"Huafu Pei ,&nbsp;Yi Zhao ,&nbsp;Siqi Zhang","doi":"10.1016/j.catena.2025.109190","DOIUrl":"10.1016/j.catena.2025.109190","url":null,"abstract":"<div><div>Desiccation-induced cracking is a critical factor contributing to the occurrence of various hydrological, agricultural, geotechnical, and geological hazards. Therefore, monitoring and early warning of volume shrinkage and tensile failure caused by desiccation in cohesive soils are of paramount importance. In this study, an early warning model is proposed for the desiccation-induced cracking of soil based on optical frequency domain reflectometry (OFDR). The early warning model accounts for the impact of evaporation heterogeneity on moisture content and the curling effect caused by boundary constraints. Design of pullout and drying tests to validate the scientific robustness of the model. A strong correlation is found between soil strain and the temporal evolution of cracks. The early warning model predicts potential cracking zones based on the monitored strain and stress fields. The real-time strain field monitoring is conducted using OFDR technology. The early strain field exhibits a saddle-shaped distribution due to the effects of evaporation heterogeneity and boundary conditions. Early warning of potential cracking zones is achieved by identifying regions with abnormal strain increments. The stress field is determined based on the theoretical framework of the early warning model. During the drying process, tensile stress accumulates in the soil. Cracking occurs when this tensile stress reaches the maximum tensile strength of the soil. By analyzing the distribution of the soil stress field, potential cracking zones can be effectively identified. The model provides valuable insights for real-time monitoring and early warning of soil desiccation, with the potential to advance disaster prevention strategies.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109190"},"PeriodicalIF":5.4,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131763","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":"Integrating vegetation constraints to reduce parameter uncertainty in watershed modeling of in-stream organic carbon","authors":"Byeongwon Lee ,&nbsp;Hyemin Jeong ,&nbsp;Younghun Lee ,&nbsp;Minchang Kim ,&nbsp;Yoonnoh Lee ,&nbsp;Shinbeom Park ,&nbsp;Min-Gyeong Kim ,&nbsp;Moonil Kim ,&nbsp;Gregory McCarty ,&nbsp;Xuesong Zhang ,&nbsp;Sangchul Lee","doi":"10.1016/j.catena.2025.109181","DOIUrl":"10.1016/j.catena.2025.109181","url":null,"abstract":"<div><div>A newly developed Soil and Water Assessment Tool-Carbon (SWAT-C) model has been widely adopted for watershed-level carbon cycling, but its parameter uncertainty has been rarely explored. This study quantified how additional vegetation constraints (leaf area index [LAI] and crop yield) reduce parameter uncertainty in SWAT-C simulations of in-stream organic carbon within an agricultural watershed. Using a sequential constraint approach, the SWAT-C model was calibrated under various configurations of constraints: standalone streamflow (PAR-F); streamflow and POC/DOC (PAR-FP/ PAR-DP); streamflow with POC/DOC and RS-LAI (PAR-FPL/ PAR-FDL); streamflow with POC/DOC, RS-LAI, and crop yield (PAR-FPLC/ PAR-FDLC). The model performance was assessed using Nash–Sutcliffe efficiency (NSE) and percent bias (P-bias). This study counted the number of behavioral parameter sets for individual constraint configurations to quantify the parameter uncertainty. The results showed that introducing these constraints notably decreased the number of behavioral parameter sets from 17 (PAR-FP) to 2 (PAR-FPLC) and from 63 (PAR-FD) to 4 (PAR-FDLC), reducing parameter uncertainty. The incorporation of vegetation constraints improved the model’s performance in simulating in-stream organic carbon. The NSE of the PAR-FPLC was 0.02 – 0.03 greater than PAR-FP and PAR-FPL, indicating an enhancement in the accuracy of POC predictions. While the validation performance of PAR-FDLC was lower than PAR-FD and PAR-FDL, additionally constraining the model with vegetation dynamics helped identify reliable globally optimal parameters. Overall, our findings suggested that incorporating additional vegetation constraints enhanced the predictive capability of the SWAT-C model, introducing a more reliable way to simulate in-stream organic carbon within an agricultural landscape.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109181"},"PeriodicalIF":5.4,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130807","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":"Paleoenvironmental changes in the northeastern margin of the Tibetan Plateau since MIS 3: Magnetic evidence from the second terrace of the Yellow River","authors":"Jiawen Zhao ,&nbsp;Longsheng Wang ,&nbsp;Yuzhu Zhang ,&nbsp;Yinglu Chen ,&nbsp;Shouyun Hu ,&nbsp;Liwei Meng ,&nbsp;Guiye Zhang ,&nbsp;Yanju Ge ,&nbsp;Chao Zhan ,&nbsp;Qing Wang","doi":"10.1016/j.catena.2025.109161","DOIUrl":"10.1016/j.catena.2025.109161","url":null,"abstract":"<div><div>Environmental magnetic analysis of profile NYQ-A from the second terrace of the Yellow River in Zoige Basin, Tibetan Plateau, provides insights into regional paleoenvironmental evolution. The results indicate that the magnetic minerals in these sediments are primarily composed of Pseudo-Single-Domain (PSD) magnetite and Single-Domain (SD) greigite. The paleo-deep lake deposits (A) represent sedimentation occurring before 51.82 ± 2.34 ka, while paleo-deep lake deposits (B) formed between 39.18 ± 2.03 and 36.77 ± 1.66 ka. Higher values of χ, SIRM, χ_ARM/χ, and χ_ARM/SIRM indicate predominance of fine-grained magnetic minerals due to strong weathering in the watershed, suggesting a warm and humid climate with increased precipitation and meltwater. The paleo-shallow lake deposits (A) formed between 51.01 ± 2.19 and 39.54 ± 1.72 ka. Lower values of χ, χ_ARM, SIRM, χ_ARM/χ, and χ_ARM/SIRM indicating dry and cold conditions that led to coarse-grained sediments with minimal weathering. The paleo-shallow lake deposits (B), formed between 36.73 ± 2.04 ka and 31.44 ± 1.97 ka, show increased hard magnetic minerals, reflecting enhanced Yellow River input of coarse sediments. Under the dual influence of a warm and humid climate and the neotectonics of the East Kunlun Fault, headward erosion of Yellow River has intensified, triggering a decline in paleo-lake water level. High magnetic minerals contents of two overbank flood deposits (OFD) suggest warm-climate weathering, while low χ_ARM/χ and χ_ARM/SIRM values indicate strong hydrodynamic conditions. The intensification of the East Asian Summer Monsoon and glacial melting initiated OFD1, which occurred between 30.43 ± 3.76 ka and 27.47 ± 3.57 ka, corresponding to MIS 3a period. OFD2 occurred between 15.30 ± 1.04 ka and 12.93 ± 1.63 ka, coinciding with the Bølling-Allerød event. At these two periods, the water was mainly derived from the accelerated melting of mountain glaciers surrounding the basin and/or the large-scale precipitation, which led to the overbank floods. The research findings enhance the application of environmental magnetism in the study of river terrace sedimentary sequences.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"257 ","pages":"Article 109161"},"PeriodicalIF":5.4,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130808","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}