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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Seasonal delta C-13(DIC) sourcing and geochemical flux in telogenetic epikarst of south-central Kentucky
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Seasonal delta C-13(DIC) sourcing and geochemical flux in telogenetic epikarst of south-central Kentucky

机译：肯塔基州中部地球素锥形阶段的季节性三角洲C-13（DIC）采购和地球化学助焊剂

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Telogenetic epikarst carbon sourcing and transport processes and their associated hydrogeochemical responses are complex and dynamic. Carbon dioxide (CO2) transport rates in the epikarst zone are often driven by hydrogeochemical responses, which influence carbonate dissolution and conduit formation. This study examines the influence of land use on carbon sourcing and carbonate dissolution kinetics through a comparative analysis of separate, but similar, epikarst systems in south-central Kentucky. The use of high-resolution hydrogeochemical data from multiple data loggers and isotope analysis from collected water samples reflects the processes within these epikarst aquifers, which are estimated to contribute significantly to bedrock dissolution. Results indicate that, in an agricultural setting, long-term variability and dissolution is governed by seasonal production of CO2. In a more urbanized, shallower epikarst system, land cover may affect CO2 transport between the soil and underlying bedrock. This concentration of CO2 potentially contributes to ongoing dissolution and conduit development, irrespective of seasonality. The observed responses in telogenetic epikarst systems seem to be more similar to eogenetic settings, which is suggested to be driven by CO2 transport occurring independent of high matrix porosity. The results of this study indicate site-specific responses with respect to both geochemical and delta C-13(DIC) changes on a seasonal scale, despite regional geologic similarities. The results indicate that further comparative analyses between rural and urban landscapes in other karst settings is needed to delineate the impact of land use and seasonality on dissolution and carbon sourcing during karst formation processes. (c) 2019 John Wiley & Sons, Ltd.
机译：电梭心肌碳采购和运输过程及其相关的水力地理反应是复杂的和动态的。 EPikarst区中的二氧化碳（CO2）运输速率通常由水力地理响应驱动，影响碳酸酯溶解和导管形成。本研究探讨了土地利用对碳源和碳酸盐溶出动力学的影响，通过对肯塔基州中南部的单独进行，但相似的，相似的Epikarst系统进行了比较分析。从收集的水样中使用来自多个数据记录器和同位素分析的高分辨率水力地理数据反映了这些截止含水层内的过程，这些过程估计可以显着贡献到基岩溶解。结果表明，在农业环境中，长期变异性和解散受二氧化碳季节性生产的管辖。在一个更城市化的，较浅的Epikarst系统中，陆地覆盖可能会影响土壤和底层基岩之间的二氧化碳运输。无论季节性如何，这种二氧化碳浓度都可能导致持续的溶解和导管发展。观察到的电离梭菌Epikarst系统的反应似乎与源性环境更类似于，这表明由与高矩阵孔隙率无关的CO 2传输驱动。该研究的结果表明，尽管区域性地质相似度，但是，尽管区域性等级，但是对地球化学和ΔC-13（DIC）变化的现场特异性反应。结果表明，其他喀斯特地区的农村和城市景观之间的进一步比较分析是在喀斯特形成过程中描绘土地利用和季节性对溶解和碳源的影响。 （c）2019 John Wiley＆Sons，Ltd。

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