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首页> 外文期刊>Geodinamica Acta >Variations in seepage water geochemistry induced by natural and anthropogenic microclimatic changes: Implications for speleothem growth conditions
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Variations in seepage water geochemistry induced by natural and anthropogenic microclimatic changes: Implications for speleothem growth conditions

机译：自然和人为的小气候变化引起的渗流水地球化学变化：对斑竹生长条件的影响

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摘要

During an annual cycle the affect of microclimatic changes (of natural and anthropogenic origin) on the geochemical characteristics of seepage water and mineral precipitation rates was analyzed for two karstic caves which contrast in environmental stability and energy exchange with exterior. On the one hand, Castafiar cave (Caceres, Spain) is an extremely controlled show cave with limited visitation showing a minimum exchange rate of energy with the external atmosphere and, secondly, Canelobre cave (Alicante, Spain), is a widely visited cave where the anthropogenic impact generates rapid and high-energy environmental changes. Mineral saturation state of seepage water of both caves is controlled by microclimatic variations, such as: 1) natural underground air renewal through the porous system of the upper soil and the network of host-rock fissures, or elso through the cave entrance, 2) cumulative disruptions in the pCO_2 levels of cave air due to the presence of visitors, and 3) forced ventilation of the subterranean atmosphere due to the uncontrolled opening of cave entrances. The obtained results reinforce the significance of the microclimatic fluctuations on short time scales in the dynamics of the subterranean karst systems, in terms of rates of mineral precipitation and growth of speleothems, as well as their key role for cave conservation.
机译：在一个年度周期中，分析了两个岩溶洞穴的微气候变化（自然和人为起源）对渗水的地球化学特征和矿物沉淀速率的影响，这两个洞穴在环境稳定性和与外部的能量交换方面形成对比。一方面，Castafiar洞穴（西班牙卡塞雷斯）是受到严格控制的表演洞穴，参观人数有限，显示出与外界大气的最低能量交换率;其次，Canelobre洞穴（西班牙阿利坎特）是参观人数最多的洞穴人为影响产生了快速而高能量的环境变化。两个洞穴的渗透水的矿物质饱和状态受微气候变化的控制，例如：1）通过上层土壤的多孔系统和基质-岩石裂隙的网络，或通过洞穴入口的Elso，进行天然地下空气更新，2）由于游客的到来，使洞穴空气的pCO_2水平发生累积破坏; 3）由于洞穴入口不受控制的开放，迫使地下大气通风。所获得的结果加强了地下岩溶系统动力学中短期尺度上的微气候波动的重要性，就矿物质的沉积速率和泥炭纪的生长及其在洞穴保护中的关键作用而言。

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