Catena最新文献

{"title":"Mechanisms underlying the impacts of extreme temperatures on carbon and energy fluxes in dryland ecosystems","authors":"Simin Zhang ,&nbsp;Tingxi Liu ,&nbsp;Limin Duan ,&nbsp;Yongzhi Bao ,&nbsp;Lina Hao ,&nbsp;Xin Tong ,&nbsp;V.P. Singh","doi":"10.1016/j.catena.2025.109401","DOIUrl":"10.1016/j.catena.2025.109401","url":null,"abstract":"<div><div>Under global climate change, the increasing frequency and intensity of extreme temperature events have significantly affected carbon and energy fluxes in dryland ecosystems. However, the underlying response mechanisms and the regulatory role of water availability remain insufficiently quantified. Based on long-term growing-season observations (2013–2024) in the Horqin Sandy Land, this study quantitatively characterized the impacts of extreme low-temperature (ELT) and extreme high-temperature (EHT) events on carbon (NEE, Reco, GPP) and energy (Rn, LE, H) fluxes in dune and meadow ecosystems, from the dual perspectives of flux anomalies and change rates, while incorporating soil moisture gradients (VWC ± ). The results showed that during the study period, EHT&amp;VWC + events increased significantly (by 65 % in dunes and 37 % in meadows), while ELT&amp;VWC − events sharply declined (by 89 % in dunes and 63 % in meadows). Carbon fluxes in dunes were highly sensitive to soil moisture conditions, with drought-induced carbon release reversible to a carbon sink upon water supplementation. In contrast, meadows exhibited stronger temperature adaptability, maintaining a stable carbon sink function (−0.20/-0.25 g C m^–2d^–1) under high-temperature drought regardless of soil water variation, likely due to their deeper root systems and higher evaporative cooling capacity, which buffer heat stress and sustain photosynthetic activity. The two ecosystems exhibited distinct energy allocation strategies: dunes dissipated energy primarily by enhancing sensible heat flux (H sensitivity = 0.90), whereas meadows prioritized the regulation of latent heat flux (LE sensitivity = 0.84). This study proposed an “event frequency–water regulation–flux response” framework, which provided methodological support and empirical basis for the resilience assessment of dryland ecosystems to climate extremes and the optimization of management strategies.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109401"},"PeriodicalIF":5.7,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907434","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":"Distribution of arsenic concentrations in soils historically impacted by mining activities: Cross-validation of pXRF methodology and application to the Orbiel valley (France)","authors":"Marie Heydon ,&nbsp;Magali Philippe ,&nbsp;Jean-Marc Antoine ,&nbsp;Jérôme Viers ,&nbsp;Aude Calas ,&nbsp;François Aussaguel ,&nbsp;Rémi Freydier ,&nbsp;Mylène Marie ,&nbsp;Philippe Behra ,&nbsp;Eva Schreck","doi":"10.1016/j.catena.2025.109389","DOIUrl":"10.1016/j.catena.2025.109389","url":null,"abstract":"<div><div>Understanding contaminant distribution in industrial and mining areas is essential for protecting human health and the environment, although traditional mapping methods are costly and time-consuming. This study aims to provide, using portable X-ray fluorescence (pXRF), rigorous maps of soil As concentrations over the Orbiel valley, historically impacted by mining activities since several decades. After a cross-calibration of pXRF with ICP-MS, we mapped As distribution in topsoils, and investigated factors influencing As dispersion. Two field campaigns were conducted: one targeting riverbanks and floodplains, the other on a 1 x 1 km grid over a 10 km radius from pollution sources. Spatial mapping identified three zones with high As concentrations (193–342 mg kg⁻¹), exceeding background levels (44 mg kg⁻¹), with floodplains particularly impacted (178 mg kg⁻¹), likely due to transport processes. Our findings confirm pXRF as a powerful tool for rapid, high-resolution As contamination screening in post-mining contexts. Cross-calibration showed no significant differences between pXRF and ICP-MS (Kruskal-Wallis, p &gt; 0.05) and strong correlations (Pearson R &gt; 0.90). Optimal pXRF modes (Soil, TestAllGeo and Mining modes) ensured accurate measurements of As, Pb, Mn, and Zn. Finally, the maps of As distribution over the valley, as well as Pb isotopic data in the different environmental compartments, suggest both a local origin of this contamination and the influence of rivers but above all atmosphere in As dispersion.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109389"},"PeriodicalIF":5.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903751","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":"Effect of waste-derived synthetic zeolite on soil hydraulic properties and soil water storage parameters in sandy-loam soils","authors":"Antonio Satriani ,&nbsp;Stella Lovelli ,&nbsp;Claudia Belviso ,&nbsp;Alessandro Comegna","doi":"10.1016/j.catena.2025.109395","DOIUrl":"10.1016/j.catena.2025.109395","url":null,"abstract":"<div><div>Zeolites are used in agriculture to amend soil chemical and physical properties. They have complex internal frameworks that enable them to alter soil texture and structure, with a direct influence on the soil’s hydrological behavior, enabling better control of groundwater contamination and more efficient irrigation management practices. This ability provides opportunities to optimize water and solute movement in coarse-textured soils while enhancing nutrient availability due to their high cation exchange capacity and water retention. In this study, a series of laboratory experiments were conducted on sandy-loam soils with different pedological characteristics, mixed with a synthetic zeolite derived from fly ash, a byproduct of coal combustion. Repacked soil samples were amended with three different zeolite concentrations (2 %, 5 %, and 10 % by weight) and subsequently analyzed for their hydraulic properties and soil water storage parameters (SWSPs) of agronomic interest. Consistent with recent research findings, our results indicate that zeolite influences soil pore-size distribution. Specifically, total soil porosity increased, with mesoporosity and microporosity rising by approximately 11% and 13%, respectively. The effects induced by zeolite showed a direct correlation with the selected soil hydraulic properties and SWSPs. Our study shows that in coarse-textured soils, incorporating an appropriate dose of zeolite enhances water retention within the soil profile while preventing excessive saturation in the root zone.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109395"},"PeriodicalIF":5.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907432","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":"Shallow-depth hardpan attributes influence soil surface and subsurface hydraulic properties","authors":"N.R.R.W.S. Rathnayake ,&nbsp;D.A.L. Leelamanie ,&nbsp;Morihiro Maeda","doi":"10.1016/j.catena.2025.109405","DOIUrl":"10.1016/j.catena.2025.109405","url":null,"abstract":"<div><div>Hardpan development is a crucial factor in determining soil hydraulic properties. Information lacks on how shallow-depth thin hardpans of a few centimeters influence soil surface and subsurface hydraulic properties. The present study aimed to assess effects of thickness of hardpan (THP<span><span>¹</span></span>), (1.7 g cm⁻³ bulk density) and depth to the hardpan (DHP<span><span>²</span></span>) on initial infiltration rate (<em>I</em>_i), unsaturated hydraulic conductivity (<em>K</em>), sorptivity (<em>S</em>_W), and steady-state infiltration rate (<em>I</em>_SS). Three THP levels (1 cm: THP_1, 3 cm: THP₃, 5 cm: THP₅) and four DHP levels (0 cm: DHP₀, 1 cm: DHP₁, 3 cm: DHP₃, 5 cm: DHP₅) were tested in the experiment with a control (no hardpan) in prepared soil columns. Soil hydraulic properties were measured using a Mini disk infiltrometer. All soil columns with hardpans showed significantly lower <em>I</em>_i, <em>K</em>_, <em>S</em>_W, and <em>I</em>_SS compared with the control (<em>p</em> &lt; 0.05). Surface hardpan (DHP₀) revealed &gt;90 % decline in <em>I</em>_i, <em>K</em>_, and <em>S</em>_W compared with the control. At DHP₁, <em>I</em>_i, <em>K</em>, <em>S</em>_W, and <em>I</em>_SS showed 19–44 %, 71–95 %, 43–57 %, and 50–70 % reductions, respectively, at the three thickness levels compared with the control. As DHP increased (DHP₃, DHP₅), the percentage declines of these parameters gradually decreased, showing their values closer to control at DHP₅. Hardpans with 1 cm thickness showed an increase in cumulative infiltration after ∼60 s stagnant period, suggesting a potential for water flow to pass through the hardpan. The <em>I</em>_i showed strong positive linear correlations with <em>S</em>_W and <em>K</em> confirming that impeded surface water-entry not only influences surface water absorption, but also influences water movements within the soil. Present study further confirms that both surface and subsurface hydraulic properties can be detrimentally affected as a result of diminished pore geometry due to shallow-depth hardpans. Further experiments are required to explore the effects of shallow-depth hardpans on soil hydraulic properties with different soil types.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109405"},"PeriodicalIF":5.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903653","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":"The contributions of climate, permafrost, and snow factors to vegetation change in northern hemisphere permafrost regions","authors":"Xiaoqing Peng ,&nbsp;Yaohua Zhao ,&nbsp;Oliver W. Frauenfeld ,&nbsp;Panpan Wang ,&nbsp;Gubu Qiumo ,&nbsp;Chen Yang ,&nbsp;Hengxing Luo ,&nbsp;Qian Li ,&nbsp;Qinshan Zhao ,&nbsp;Lili Li ,&nbsp;Jia Sui","doi":"10.1016/j.catena.2025.109397","DOIUrl":"10.1016/j.catena.2025.109397","url":null,"abstract":"<div><div>Northern permafrost regions are experiencing a warming trend, leading to permafrost degradation and changes in snow cover. Concurrently, vegetation is generally greening, primarily attributed to climatic factors such as air temperature. However, the contributions of permafrost (active layer thickness, ALT) and snow (earlier snow onset, SOM) to vegetation changes remain unclear. For 2001–2021, we therefore determine the start of the growing season (SOS), the end of the growing season (EOS), and the annual maximum normalized difference vegetation index (MaxNDVI) as indicators of vegetation growth. We also chose representative factors for climate, permafrost, and snow. The results indicate an earlier soil thaw start date (SOT) and a deepening of the ALT promoted the earlier SOS and the increase in MaxNDVI. SOM also facilitated the earlier SOS, while also affecting MaxNDVI. Increased snow depth positively influenced vegetation growth in some areas. From 2001 to 2021, the average contribution of climate, permafrost, and snow factors to vegetation changes ranged 61–72 %, 15–25 %, and 12–14 %, respectively. Climatic factors remained the dominant drivers of vegetation change, followed by permafrost. For SOS, SOT and ALT exhibited positive and negative influences, respectively. For EOS, changes in ALT showed a negative influence, indicating that continued deepening of ALT may hinder the delay of EOS and shorten the growing season. Snow cover had a far smaller influence on vegetation changes compared to climate. This study represents the first attempt to quantify the contributions of climate, permafrost, and snow to vegetation changes in northern permafrost regions, providing new insights and laying the groundwork for future research.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109397"},"PeriodicalIF":5.7,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903654","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":"High-severity fire reduces soil erosion resistance: A study based on 4-year field monitoring data in dry-warm valley in Southwest China","authors":"Xiaosong Qin ,&nbsp;Yi Wang ,&nbsp;Longxi Cao ,&nbsp;Ping Ren ,&nbsp;Wei He ,&nbsp;Yongkang Li ,&nbsp;Dongdong Hou ,&nbsp;Yufan Wang ,&nbsp;Jia Xu","doi":"10.1016/j.catena.2025.109400","DOIUrl":"10.1016/j.catena.2025.109400","url":null,"abstract":"<div><div>Forest fire has occurred frequently in the dry-warm valley of Southwest China in recent years. Fire changes physicochemical properties, which may further affect soil erosion resistance (rill erodibility (<em>K_r</em>) and critical shear stress(<em>τ_c</em>)). However, few studies have examined the effects of high-severity fire on <em>K_r</em> and <em>τ_c</em> and the temporal variation characteristics. To evaluate the temporal variation in <em>K_r</em> and <em>τ_c</em> and the influencing factors after high-severity fire, soil samples were collected from burned areas 0.5, 1, 2 and 3 years after the fire, and from unburned areas. Then, <em>K_r</em> and <em>τ_c</em> were determined via a flume experiment at three slopes (17.6, 36.3 and 57.7 %) and five flow discharges (0.8, 1.6, 2.4, 3.2 and 4.0 L s⁻¹). The results revealed that <em>K_r</em> and <em>τ_c</em> varied in the ranges of 0.0006–0.0013 s m⁻¹ and 0.8144–2.2584 Pa, respectively. Compared with the unburned areas, the burned areas presented an increase in <em>K_r</em> of 20 %–160 % and a decrease in <em>τ_c</em> of 37.29 %–77.39 %. With the prolonging of restoration years, <em>K_r</em> gradually decreased and <em>τ_c</em> gradually increased, but it was still lower than the level in unburned areas. Correlation analysis and structural equation modeling showed that median soil particle size (total effects of 0.49 and −0.27, respectively, <em>p</em> &lt; 0.05) and soil organic matter (total effects of −0.71 and 0.90, respectively, <em>p</em> &lt; 0.05) were the most significant factors affecting <em>K_r</em> and <em>τ_c</em> during the 0.5–3 years experiment post-fire. <em>K_r</em> (<em>R²</em> = 0.613, <em>NSE</em> = 0.582) and <em>τ_c</em> (<em>R²</em> = 0.974, <em>NSE</em> = 0.974) could be well estimated by bulk density, median soil particle size, root mass density, soil shear strength, soil organic matter and recovery time. These results provide new insights into the mechanism of the influence of post-fire on soil erosion resistance in the dry-warm valley.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109400"},"PeriodicalIF":5.7,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144894987","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":"Soil and geomorphology in central Africa and C.G. Trapnell’s contribution to our understanding","authors":"R. Webster ,&nbsp;L.M. Chabala ,&nbsp;S. Sichinga ,&nbsp;R.M. Lark","doi":"10.1016/j.catena.2025.109386","DOIUrl":"10.1016/j.catena.2025.109386","url":null,"abstract":"<div><div>The Zambian landscape is dominantly one of gently tilted plateaux at 1100 to 1600 m above sea level. It is mantled by soil in the final stages of weathering of the underlying Precambrian rocks, during 1 or more million years. This soil is devoid any further weatherable minerals and poor in cations and other plant nutrients. The plateaux are bevelled at their margins as stream have cut back from the down-faulted Luangwa and Zambesi valleys. This bevelled terrain, designated by C.G. Trapnell as Upper Valley, bears relatively young rich soil and a characteristic vegetation that contrast markedly from those of the plateaux. This physiographic contrast is fundamental. It is geographically and agriculturally significant, and both were recognized by Trapnell in 1930s against the prevailing view that climate was the over-riding factor in soil distribution.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109386"},"PeriodicalIF":5.7,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144894986","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":"Net ecosystem exchange of CO2 and its driving mechanisms in an island forest nature reserve in southern China","authors":"Liangxu Wu ,&nbsp;Shuya Xie ,&nbsp;Xianglan Li ,&nbsp;Pengpeng Tian ,&nbsp;Zhe Xu ,&nbsp;Yuting Huang ,&nbsp;Jingfeng Xiao ,&nbsp;Xintong Chen ,&nbsp;Minghai Xu ,&nbsp;Wei Chen ,&nbsp;Houcai Cai","doi":"10.1016/j.catena.2025.109382","DOIUrl":"10.1016/j.catena.2025.109382","url":null,"abstract":"<div><div>Carbon sequestration in island forests is a significant component of the global carbon sink. Monsoon island forests experience unique land − sea interactions, including seasonal variations in hydrothermal conditions. However, the seasonal changes in their carbon exchange and response mechanisms to environmental changes remain unclear. This study measured the net ecosystem exchange of carbon dioxide (CO₂) (NEE) during 2020–2022 using the eddy covariance technique in an island forest ecosystem in the Nanji Islands National Marine Protected Area. During the study period, the island forest acted as a significant CO₂ sink, with annual NEE, gross primary productivity (GPP), and ecosystem respiration (Re) of −548.6, 1881.5, and 1332.9 g C m⁻², respectively. The NEE, GPP, and Re fluxes exhibited seasonal variations, with the mean GPP and Re in the wet season being significantly higher than in the dry season (<em>p</em> &lt; 0.001). The mean diurnal NEE was −2.0 g C m⁻² day⁻¹ in the wet season and −1.0 g C m⁻² day⁻¹ in the dry season. This disparity was due to the higher sensitivity of GPP to radiation and temperature during the wet season compared to Re, resulting in a significantly greater increase in GPP than Re during the wet season (<em>p</em> &lt; 0.001). The primary driving factors of GPP, Re, and NEE during the wet season were photosynthetically active radiation (PAR) and air temperature (Tair), while soil water content (SWC) impacted most during the dry season. Specifically, there was an exponential decrease in PAR regarding to diurnal CO₂ fluxes, and the low SWC suppressed diurnal carbon sequestration. Tair was linearly and positively correlated with the nocturnal CO₂ fluxes, and a high SWC promoted nocturnal carbon emissions only during the dry season. The results of this study will improve our understanding of the response of monsoon island forests to land − sea interactions and climate change.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109382"},"PeriodicalIF":5.7,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144894983","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":"Cretaceous biological soil crusts: a glimpse of ancient dryland microbial life and soil development","authors":"Diego Luciano Nascimento,&nbsp;Francisco Sérgio Bernardes Ladeira","doi":"10.1016/j.catena.2025.109390","DOIUrl":"10.1016/j.catena.2025.109390","url":null,"abstract":"<div><div>Biological soil crusts (BSCs) are bio-sedimentary structures that play vital ecological roles in modern extreme environments. As microbial communities thriving in disturbed settings under hydrological stress and erosion, they function as both ecosystem engineers and pioneer colonizers of bare soils, particularly in arid and polar regions. Despite their significance for soil development and ecological succession and their widespread occurrence in contemporary environments, BSCs remain markedly underrepresented in paleopedological records. This study presents a detailed macro and micromorphological analysis of Cretaceous biological soil crusts preserved in paleosols of Marília Formation (Bauru Basin, Brazil), elucidating their biogenic origin and paleoenvironmental significance. The studied crusts exhibit characteristic microbial sedimentary structures, including wrinkle marks, gas domes, fenestral porosity, and desiccation cracks, alongside well-preserved coccoid microbial filaments, extracellular polymeric substances (EPS), and carbonate spherulites. These features closely resemble modern humipedons, particularly crusto-humus systems characterized by organic (CruO) and organo-mineral (CruOA) AC horizons. Such structures reflect enhanced organic matter accumulation and biological activity during soil development, further supporting their interpretation as cyanobacteria-dominated microbial mats (BSCs) that stabilized floodplain. Micromorphological and SEM analyses confirm bioweathering signatures, calcified root cells, and microbial-induced CaCO₃ precipitation, reinforcing their biogenicity. The association of BSCs with rhizoliths and invertebrate trace fossils indicates periods of landscape stability and incipient ecological succession following sedimentary deposition. Paleoenvironmental reconstruction points to seasonally semi-arid conditions punctuated by intermittent flooding events, with BSCs developing during intervals of subaerial exposure. This study underscores the significance of BSCs for interpreting paleosols and sedimentation dynamics, providing new insights into Cretaceous terrestrial ecosystems.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109390"},"PeriodicalIF":5.7,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144894984","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":"Quantitative analysis of the chromaticity of Holocene aeolian sand–palaeosol sequences and its application to palaeoclimate reconstruction across the Asian summer monsoonal boundary of northern China","authors":"Bing Liu ,&nbsp;Heling Jin ,&nbsp;Jianhui Ge ,&nbsp;Xiaolei Liang ,&nbsp;Aimin Liang ,&nbsp;Jianhui Jin ,&nbsp;Caixia Zhang ,&nbsp;Hui Zhao ,&nbsp;Shuang Zhao","doi":"10.1016/j.catena.2025.109394","DOIUrl":"10.1016/j.catena.2025.109394","url":null,"abstract":"<div><div>Chromaticity is the most visually striking soil attribute, especially in the dunefields of the Asian summer monsoonal boundary (ASMB) region in northern China. Here, dark palaeosol–yellow aeolian sand sequences are regarded as direct evidence of changes in regional earth surface processes and the Asian monsoon, due to the alternation of strong pedogenesis and aeolian activity during the geological past. However, the mechanisms generating the color variations of these palaeosol–aeolian sand sequences are unclear, including how the color variations of such sequences can indicate past climatic and environmental changes. To address this, we conducted qualitative and quantitative analyses of variations in various chromaticity parameters and the potential influencing factors within four typical palaeosol–aeolian sand sequences in the dunefields of the ASMB region. Relatively low values of a* and b and high values of L* occurred in the aeolian sand layers, compared to the palaeosol units. Within individual aeolian sequences, the sedimentary provenance is relatively stable and that the iron oxides content is the main control of variations in color parameters. We attribute this to an enhanced Fe oxides content caused by intensified pedogenesis under increased precipitation/moisture. A palaeoclimate reconstruction using color parameters showed that decreased L* and increased a* values in the palaeosol layers are consistent with increased quantitatively-reconstructed annual precipitation (P_ANN)/moisture recorded by multiple archives across the ASMB region of northern China. These observations confirm that color parameters are robust indicators for tracing past environmental changes in this region. Our approach provides a reliable methodology for quantifying the factors controlling the chromaticity of aeolian sedimentary sequences in the northern Chinese dunefields; and they also show that the Fe oxides content of aeolian sediments is directly related to variations in precipitation/moisture, and that it can be used as a semi-quantitative proxy for climate processes and dynamics.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"259 ","pages":"Article 109394"},"PeriodicalIF":5.7,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144894982","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}