Catena最新文献

{"title":"Landscape evolution of the Torres Trough, Paraná Basin, southern Brazil, based on morphostructural analysis","authors":"Lucas Masnik Kosciuv,&nbsp;Luana Moreira Florisbal,&nbsp;Breno Leitão Waichel","doi":"10.1016/j.catena.2024.108530","DOIUrl":"10.1016/j.catena.2024.108530","url":null,"abstract":"<div><div>The upper Paraná Basin units of the Serra Geral Group comprise the aeolian sandstones of the Botucatu Formation and overlying lava flows. Since distinct altitudes of the boundary between these units are observed (from 0 m up to 1200 m m.s.l), referred to as the Botucatu aeolian sandstones-lava flow boundary (BLB), it is as a key reference surface for identifying and quantifying major vertical faults and relative displacements across these faults. To map and model these displacements, integrated data from stratigraphic wells, fieldwork in key areas and remote sensing image analysis were utilized. Block displacements were observed in SSW-NNE profiles along the Southern escarpment, where the contact surface boundary ranges from sea level in the South to over 1200 m to the Northwest, indicating a progressively increasing elevation of the BLB towards the North. This trend is also evident in the ESE-WNW cross-section on the Serra Geral Plateau, where the BLB varies in stratigraphic well data from −534 m to 691 m from SW to NE. Additionally, the altitudes of the boundary between the Paraná Basin and the basement rocks (Basin-Basement Boundary − BBB) were analyzed, revealing the lowest points in a stratigraphic well in the NW (−3000 m) near the Torres Trough and the highest points in the NE (400 m). The significant altitude variations at both boundaries are constrained by the main lineaments observed in the area defining horst and graben domains. Notably, the Torres Trough, also referred to as the Torres Syncline, is identified as a structural low trending SE-NW. This suggests that the SE borders of the basin form part of the flanks of the Cretaceous rift, while the NE region represents a prominently uplifted block. The integration of lineaments delineates an extensive horst and graben system that developed post-Gondwana breakup, configuring four main domains based on the BLB altitudes: Torres, RS (−120 to 150 m), Timbé do Sul (200 to 500 m), Serra do Rio do Rastro (600 to 900 m), and Urubici, SC (1000–1300 m). Phanerozoic and later Cenozoic tectonic activity significantly altered the configuration of the Paraná Basin, through major block tilting and faulting, particularly along the<!--> <!-->escarpments.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108530"},"PeriodicalIF":5.4,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663060","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 interplay between prehistoric vegetation, climatic fluctuations and anthropogenic activities in Central China","authors":"Panpan Chen ,&nbsp;Peng Lu ,&nbsp;Yan Tian ,&nbsp;Ye Li ,&nbsp;Hui Wang ,&nbsp;Jiaqiang Zhang ,&nbsp;Xiangli Zhao ,&nbsp;Duowen Mo","doi":"10.1016/j.catena.2024.108540","DOIUrl":"10.1016/j.catena.2024.108540","url":null,"abstract":"<div><div>The interaction between climate, hydrological environment, and human activities in prehistoric times has consistently attracted significant interest. However, the process and mechanism of this interaction remain unclear due to a lack of detailed materials that provide information on both human activity and environmental evolution. Here we present a comprehensive dataset of optically stimulated luminescence (OSL) dating and pollen analysis derived from lacustrine facies deposits in the vicinity of the Dongzhao Site in Central China, which is a key region for the origin and development of Chinese civilization. These data have revealed the existence of multiple cycles of environment-human interaction during prehistoric periods. The gradual improvement in the climate and minor fluctuations facilitated the settlement of prehistoric populations in the region, fostering uninterrupted cultural development for millennia since the early Holocene. The increase in population and intensification of human activities significantly affected regional vegetation, resulting in a decrease in the number of trees around 4.0 ka BP. Environmental changes influenced the prehistoric architectural style, resulting in a decrease in houses with “wood bone and mud walls” that were prevalent during the Yangshao periods (7.0–5.0 ka BP) due to a lack of trees. Our research once again highlights the perpetual cycle of interdependence and interaction between natural environments and human activities.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108540"},"PeriodicalIF":5.4,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663057","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":"Key factors influencing the spatial distribution of soil organic carbon and its fractions in Mollisols","authors":"Xiaoguang Niu,&nbsp;Shaoliang Zhang,&nbsp;Chengbo Zhang,&nbsp;Pengke Yan,&nbsp;Hao Wang,&nbsp;Weitao Xu,&nbsp;Mingke Song,&nbsp;Muhammad Aurangzeib","doi":"10.1016/j.catena.2024.108522","DOIUrl":"10.1016/j.catena.2024.108522","url":null,"abstract":"<div><div>Soil organic carbon (SOC) is a key component of the global carbon pool, which is crucial to the fertility and health of soils and deeply influences global carbon cycling. “Mollisols belts” with high SOC storage are considered as the natural breadbasket of the world, and SOC transformation between the sources and sinks profoundly affects global climate change. In this review, based on the newest publications, the effects of both natural and anthropic factors on the decomposition, migration, and transformation of SOC and further influencing the spatial distribution of SOC and its fractions in Mollisols were summarized. Furthermore, we summarized the debates on the spatial changes of SOC and its fractions in Mollisols from publications and analyzed the causes of these debates. Generally, climate change, land use types, fertilization, tillage practices combined with topographic factors, hydrologic process, and soil erosion process significantly influence the spatial distribution of SOC. As well, in the Mollisols, (1) Global warming and elevated CO₂ may increase the content of labile organic carbon fractions and affect the soil-atmosphere carbon cycle. (2) The conversion of abandoned cropland to forest or grassland, and the conversion of dry cropland to paddy field may improve the carbon sequestration capacity of terrestrial ecosystems, while rational fertilization and organic inputs reduce the SOC loss of natural ecosystems converting to cropland. (3) Conservation tillage in cropland improves the SOC storage by increasing the pool of labile organic carbon in soils. (4) A reasonable combination ratio of organic and chemical fertilization is crucial for achieving the stability of the SOC pool and the increase of the SOC storage in soils. At the end of this review, the key issues on the spatial distribution of SOC and the driving mechanisms were prospected in the future.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108522"},"PeriodicalIF":5.4,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662917","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 comprehensive assessment of greenhouse gas emissions research in the Cerrado region, Brazil","authors":"Jorge Luiz Locatelli ,&nbsp;Gustavo Vicentini Popin ,&nbsp;Rafael Silva Santos ,&nbsp;Wanderlei Bieluczyk ,&nbsp;Letícia Thomaz Cipriani ,&nbsp;Maurício Roberto Cherubin ,&nbsp;Carlos Eduardo Pellegrino Cerri","doi":"10.1016/j.catena.2024.108538","DOIUrl":"10.1016/j.catena.2024.108538","url":null,"abstract":"<div><div>The increasing demand for food, fiber, and (bio)energy boosted by population growth has accentuated agricultural expansion, increasing global greenhouse gas (GHG) emissions. This scenario is valid in Brazil, where agriculture accounts for the largest part of the nation’s GHG emissions, primarily associated with the expansion of agriculture over areas of native vegetation, especially in the Cerrado region. However, despite the contribution of this sector to GHG emissions, there is a limited understanding of how different systems affect these emissions, as well as the current state of the art on this topic. Therefore, we performed a comprehensive literature review to synthesize the information about GHG emissions in the region, including cropping systems where GHG was measured, methodological procedures, and the main results achieved. Our review shows that the subject of “GHG” has been poorly investigated, with a huge discrepancy compared to other related topics such as soil organic matter. Most studies (31 % of 236) only mentioned GHG-related terms but did not measure them. The studies that measured GHG (n = 39) were conducted mainly in the south-central part of the region and were mostly limited to short-term experiments (&lt; 5 years) or monitoring periods (&lt; 1 year), using manual static chambers. The analysis of the available GHG data indicated that converting Cerrado into agriculture increases N₂O emissions by ∼ 0.45 kg ha⁻¹ year⁻¹ while decreasing CH₄ influx by ∼ 3 kg ha⁻¹ year⁻¹. Despite that, no-tillage combined with cover crops effectively reduces N₂O emissions (∼-0.3 kg ha⁻¹ year⁻¹). Our findings reveal a significant gap in monitoring GHG fluxes in the Cerrado region, particularly in the northern part where Brazil's new agricultural frontier, the Matopiba region, is located. Efforts should prioritize generating comprehensive GHG data for Cerrado agriculture by employing more robust monitoring protocols. This would help guide producers, researchers, and policymakers to enhance agricultural management practices toward greater sustainability.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108538"},"PeriodicalIF":5.4,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663058","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":"Feasibility of proximal sensing for predicting soil loss tolerance","authors":"Hasan Mozaffari ,&nbsp;Ali Akbar Moosavi ,&nbsp;Yaser Ostovari","doi":"10.1016/j.catena.2024.108503","DOIUrl":"10.1016/j.catena.2024.108503","url":null,"abstract":"<div><div>Soil loss tolerance (T-value) is a vital parameter in soil conservation programs aiming to reduce erosion. Measuring the T-value is expensive, difficult, and time-consuming. No study was found that investigated the capability of the spectroscopy approach in visible (Vis) and near-infrared (NIR) regions to predict the T-value. Hence, we aimed to predict the T-value by the Vis-NIR spectroscopy. 60 soil profiles were excavated to measure the T-values according to the soil thickness method (STM), along with physico-chemical attributes and Vis-NIR spectra in the calcareous soils of southern Iran. The T-value was predicted using Vis-NIR reflectance spectra via applying different modeling approaches, including partial least square regression (PLSR), principal component regression (PCR), multiple linear and non-linear regressions-based spectrotransfer functions (MLR-STF and MNLR-STF), and support vector regression (SVR). The Vis-NIR reflectance spectroscopy can detect functional groups of organic matter and carbonate components in soil, so if the T-value is significantly correlated with these parameters, it is evidence that the Vis-NIR spectroscopy may be an effective approach in predicting the T-value. Hence, results revealed that the soil organic matter and calcium carbonate equivalent were significantly correlated (<em>p</em> &lt; 0.05) with the T-value by correlation coefficients (r) of 0.77 and 0.32, respectively. Among the applied SVR algorithms to predict the T-value by Vis-NIR spectra, the Epsilon type with linear kernel algorithm (Epsilon-SVR-L) showed the best performance. The T-value was predicted with acceptable accuracy using the Vis-NIR spectroscopy and applying the PLSR, PCR, MLR-STF, MNLR-STF, and Epsilon-SVR-L models with the cross-validation R² values of 0.60, 0.57, 0.61, 0.61, and 0.64, respectively. The reflectance values at wavelengths of 420, 564, 698, 1098, 1407, 1899, 1939, 2139, 2259, 2342, and 2456 nm were recognized as the most effective and predictive bands to predict the T-value and appeared in both developed STFs. Considering accuracy, simplicity, and applicability, the developed MLR-STF is recommended to predict the T-value and recognize eroded regions to conserve the soil resources of calcareous soils.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108503"},"PeriodicalIF":5.4,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663054","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 erosion prediction in multiple scenarios based on climate change and land use regulation policies in context of sustainable agriculture","authors":"Nian Li ,&nbsp;Hongying Zhao ,&nbsp;Zhibang Luo ,&nbsp;Tianwei Wang ,&nbsp;Jiawei Yang ,&nbsp;Lu Li ,&nbsp;Shuxin Que","doi":"10.1016/j.catena.2024.108525","DOIUrl":"10.1016/j.catena.2024.108525","url":null,"abstract":"<div><div>It remains a great challenge to develop feasible land use regulation strategies to control soil erosion under environmental constraints and agricultural demands. This study aims to explore the future outcomes of soil erosion under different land use regulation strategies and the impacts of climate change, while trying to incorporate regional differences in agricultural system development into these strategies. Based on historical data from 2000 to 2020 in 69 cities in South China, this study revealed the reciprocal cross-regulation patterns between soil and water conservation (SWC) and agricultural system development (ASD), highlighting the dynamic and evolving nature of their bidirectional interaction. Taking this historical experience into account, we designed an explorative scenario called discriminatory regulation with regional characteristics (DRC). This scenario assigned different sustainable regulation priorities to regions at different stages of agricultural system development based on the strength of the interaction between SWC and ASD. We also designed two reference scenarios: business as usual (BAU) and ecological and economic balance (EEB), to compare with the exploratory DRC scenario. The DRC scenario involved no additional interventions and continued the land use change trends of the past five years, while the EEB scenario implements uniform sustainable land use regulation across all regions. Ultimately, we used the CSLE model to project soil erosion outcomes under three scenarios and discussed the influencing factors. The SSP2-RCP4.5 scenario from the CMIP6 archive was chosen to provide the climate change background for the soil erosion predictions. The results of the BAU scenario show that the soil erosion modulus is predicted to be 975.75 t·km⁻²·a⁻¹ by the year 2050, exhibiting a significant increase relative to the average value of 729.03 t·km⁻²·a⁻¹ over the period 2000–2020. By 2050, climate change is projected to increase rainfall erosivity by 46.80 %, indicating that climate change will be the major driver of increased soil erosion in the future. In the EEB scenario, soil erosion will be reduced by 11.59 % compared to the BAU scenario when sustainable management is applied region-wide without discrimination. In the DRC scenario, soil erosion will be reduced by 15.68 % compared to the BAU scenario via promoting ecological restoration and encouraging conservation agriculture practices. Comparison of the three scenarios establishes that the DRC scenario is a meaningful attempt to integrate regional disparities in agricultural system development into land use regulation strategies. This study provides valuable references for policy makers to develop a holistic approach to soil resource management and coordinated regional development.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108525"},"PeriodicalIF":5.4,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663055","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 dynamics of periglacial alluvial fans mapped and quantified using time series of UAV data in Svalbard","authors":"Aleksandra M. Tomczyk ,&nbsp;Marek W. Ewertowski ,&nbsp;Wojciech Ewertowski ,&nbsp;Szymon Śledź","doi":"10.1016/j.catena.2024.108531","DOIUrl":"10.1016/j.catena.2024.108531","url":null,"abstract":"<div><div>The location of alluvial fans at the intersection of the lithosphere, hydrosphere, and atmosphere makes them valuable in recording long-term environmental changes. Short-term (annual) surface morphological changes of fans are also important, as they provide a geomorphological record of high-magnitude, low-frequency processes like debris flows or avalanches, which can pose a risk to human life, infrastructure, and cultural heritage. Our study focused on the annual dynamics of fans in Spitsbergen, Svalbard. This high-Arctic location is essential because it provides insight into the dynamics of fans in an area where climate warming is progressing at one of the highest rates on Earth, which can potentially lead to an increase in the frequency and/or magnitude of geomorphological processes. We quantified the geomorphological changes in surfaces of four debris-flow-dominated alluvial fans non-affected by direct human activity. High-resolution (cm-scale) elevation data were collected using a time series of UAV surveys conducted annually between 2015 and 2019. Our research has shown that most of the area (88–99 %) of individual fans remained stable during the studied period. However, we were still able to identify significant morphological changes using UAV data when high-magnitude, low-frequency processes such as debris flow, avalanche, or ground collapse occurred. The area of the individual fan that experienced elevation changes greater than the minimum level of detection (0.10 m) varied depending on the year, ranging from 0.2 % to approximately 8 %, with significant spatial and temporal variability. The volume of changes ranged from −2200 m³ to +4000 m³ per year, with the highest recorded erosion being 5 m and the highest deposition being 2.1 m per year. The variation in geomorphological response was caused by multiple factors, including fan and catchment morphometry, surface composition, timing of specific events, presence of permafrost, and the diversity of geomorphological processes that transformed fan surfaces.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108531"},"PeriodicalIF":5.4,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663059","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":"Spatiotemporal refinement of hydro-sediment processes in small disturbed permafrost watershed during rainfall and snowmelt events","authors":"Xiaonan Shi ,&nbsp;Ying Zheng ,&nbsp;Jiawei Su ,&nbsp;Fan Zhang ,&nbsp;Jianhang Zhu ,&nbsp;Chen Zeng","doi":"10.1016/j.catena.2024.108511","DOIUrl":"10.1016/j.catena.2024.108511","url":null,"abstract":"<div><div>Under climate change, the hydro-sediment processes in permafrost watersheds have been visibly changed, impacting the function of water conservation and ecological barrier of river source areas. However, the lack of observational data and understanding of underlying mechanisms limits the evaluation of hydro-sediment variation and its environmental response. Here, we selected a small permafrost watershed in the northern Tibetan Plateau and conducted daily and event scale observations at four cross-sections: sunny slope tributary, shady slope tributary, confluence, and watershed outlet. Results indicate that during spring, there is a stronger correlation between runoff and sediment concentration, alongside higher sediment transport efficiency per unit of runoff at the watershed outlet. The sunny slope tributary is characterized by rapid runoff generation, high peak flow and sediment load. It predominantly influences the outlet processes, contributing 83% runoff and 125% sediment load in summer rainfall events and 59% runoff and 52% sediment in spring snowmelt events. Thermokarst trench networks also contribute significantly during spring. Conversely, the shady slope tributary demonstrates a slow, sustained runoff release and low sediment concentrations, contributing minimally to the outlet. The lower mainstream channel functions as a dynamic interchange between sources and sinks of runoff and sediment. The temporal and spatial differences are discussed in relation to climate factors, soil properties, soil freeze–thaw dynamics, and land coverage. This study provides valuable insights into hydrological and sedimentary processes in high-altitude cold region and their responses to environmental changes.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108511"},"PeriodicalIF":5.4,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662914","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":"How do trade-offs between ecological construction and urbanization affect regional carbon balance? A case study from China’s Yellow River Basin","authors":"Wenle Yang,&nbsp;Jinghu Pan","doi":"10.1016/j.catena.2024.108534","DOIUrl":"10.1016/j.catena.2024.108534","url":null,"abstract":"<div><div>Anthropogenic activities, including trade-offs between ecological construction and urbanization, alter land use by either adding or subtracting from the carbon balance. Therefore, it is unknown how the trade-offs between ecological construction and urbanization impact the regional carbon balance. We selected the Yellow River Basin for this study to shed light on how human activity affects the carbon balance and promote the advancement of the objective of becoming carbon–neutral. Using panel data, soil respiration data, and GEM-CO₂ models, carbon emissions and sinks in multiple fields were quantified on a raster scale based on multi-source remote sensing data. The trade-offs between urbanization and ecological construction were then spatially illustrated through changes in ground cover. Finally, a raster-scale study was conducted to investigate the ways in which trade-offs between urbanization and ecological construction impact the regional carbon balance. The basin was able to maintain a carbon balance in 2001; however, by 2019, it experienced a severe carbon imbalance. The primary causes of this were rapid growth in energy consumption and direct household waste incineration. By 2019, 84.79% of rasters had a trade-off connection, indicating an increasing trend in the degree of trade-off between ecological construction and urbanization. This affected the pattern of land use in the basin, which in turn affected the carbon balance. Rapid urbanization has exacerbated the carbon imbalance, but ecological construction can reverse this trend. The carbon balance was negatively correlated with the trade-off between ecological construction and urbanization, and the conversion of natural resources by human activity hastened the spread of regional carbon imbalances.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108534"},"PeriodicalIF":5.4,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662915","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":"Holocene Stable Isotope (δ13C and δ15N) record of peatland development in Stavsåkra, southern Sweden","authors":"Supriyo Kumar Das ,&nbsp;Alf Ekblad ,&nbsp;Ksenija Stojanović ,&nbsp;Anna Mikusinska ,&nbsp;Marie-José Gaillard ,&nbsp;Danica Mitrović ,&nbsp;Qiao-Yu Cui","doi":"10.1016/j.catena.2024.108510","DOIUrl":"10.1016/j.catena.2024.108510","url":null,"abstract":"<div><div>Understanding the environmental and climate influence on the Holocene stable isotope record in peat is essential for applying the proxies in the paleoenvironmental reconstruction of lake and bog ecosystems. Here, we report total organic carbon (TOC), TOC to total nitrogen (N) ratio (C/N), and stable isotope ratios of organic carbon (δ¹³C) and nitrogen (δ¹⁵N) of bulk sediment and peat organic matter (OM) from a radiocarbon-dated core collected from Stavsåkra bog in southern Sweden. Changes in the TOC, C/N, δ¹³C and δ¹⁵N between 12 ka and 10.4 ka BP represent shifts in the OM source from aquatic primary producers to terrestrial swamp vegetation and pinpoint the transition of a highly productive water body into a reed swamp. The variation in δ¹³C values and increase in peat accumulation rate (AR) from 10.8 ka BP imply a rapid transition of the aquatic body into a peat-forming swamp and a shift from aquatic to atmospheric CO₂ as the source of carbon (C) to the vegetation at the site. A sharp drop in N and δ¹⁵N in the reed swamp peat may indicate fixed-N in the soil as the source of N to the growing vegetation. Heavier δ¹³C and higher C/N ratio at the bottom of wood carr peat may reflect fire events. The rapid increase in peat AR between 7 ka and 6.5 ka BP suggests increased peat deposition under warmer and drier conditions. Lighter δ¹⁵N and δ¹³C, lower N, and TOC concentrations between 1.1 ka and 0.8 ka BP likely suggest warmer conditions related to the ‘Medieval Climate Anomaly’. The research demonstrates the successful application of stable C and N isotope ratios of bulk peat in palaeoenvironment and palaeoecological interpretations.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":"247 ","pages":"Article 108510"},"PeriodicalIF":5.4,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662916","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}