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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Carbon dioxide concentration in temperate climate caves and parent soils over an altitudinal gradient and its influence on speleothem growth and fabrics
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Carbon dioxide concentration in temperate climate caves and parent soils over an altitudinal gradient and its influence on speleothem growth and fabrics

机译：海拔梯度上温带气候洞穴和母体土壤中的二氧化碳浓度及其对血丝生长和织物的影响

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摘要

Carbon dioxide (CO2) concentrations in caves and parent soils in the Italian Alps have been studied along a 2100m altitudinal range - corresponding to a mean annual temperature (MAT) range of 12 degrees C - in order to investigate the relationship between MAT, soil pCO(2) and cave air pCO(2), and to test the influence of soil pCO(2) on speleothem growth and fabric to ultimately gain insight into their palaeoclimatic significance in temperate climate settings. Our findings indicate that soil CO2 is linearly correlated to MAT and its mean annual concentration is described by the equation: soil CO2 (ppmv)=1112+460 MAT. Soil pCO(2) can also be exponentially correlated to actual evapotranspiration. The pCO(2) in the aquifer is linearly correlated to MAT at the infiltration site and is more influenced by summer soil pCO(2). Cave air CO2 in the innermost part of the caves exhibits a similar seasonal pattern, and commonly reaches concentrations of about 15% to 35%, with respect to the corresponding soil values, and is exponentially correlated to the MAT at the infiltration site. The combination of these parameters (soil pCO(2), dripwater pCO(2) and cave air pCO(2)) results in speleothem growth and controls their fabrics which are typical of four MAT/elevation belts broadly corresponding to the present-day vegetation zones. In the lower montane zone [100-800m above sea level (a.s.l.)] speleothems mostly consist of columnar fabric, in the upper montane zone (800-1600ma.s.l.) both columnar and dendritic fabrics are common, the Subalpine zone (1600-2200ma.s.l.) is characterized mostly by moonmilk deposits, whereas in the Alpine zone (above 2200ma.s.l.) no speleothems are forming today. Therefore, fabric changes in fossil speleothem can potentially be used to reconstruct MAT changes in temperate climate karst areas. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：为了研究MAT与土壤pCO之间的关系，对意大利阿尔卑斯山的洞穴和母体土壤中的二氧化碳（CO2）浓度沿2100m的海拔范围进行了研究-对应于12摄氏度的年平均温度（MAT）范围。 （2）和洞穴空气pCO（2），并测试土壤pCO（2）对斑竹生长和织物的影响，从而最终了解它们在温带气候环境中的古气候意义。我们的发现表明，土壤CO2与MAT线性相关，其平均年浓度由以下公式描述：土壤CO2（ppmv）= 1112 + 460 MAT。土壤pCO（2）也可以与实际蒸散量成指数关系。含水层中的pCO（2）与入渗点的MAT线性相关，并且受夏季土壤pCO（2）的影响更大。洞穴最内部的洞穴空气CO2表现出相似的季节性模式，相对于相应的土壤值，通常达到约15％至35％的浓度，并且与渗透位点的MAT呈指数相关。这些参数（土壤pCO（2），滴水pCO（2）和洞穴空气pCO（2））的组合导致蛇麻草生长并控制它们的织物，这是广泛对应于当今植被的四个MAT /高海拔带的典型特征区域。在较低的山地带[海拔100-800m（asl）]处，鞘脂主要由柱状织物组成，在较高的山地带（800-1600ma.sl）中柱状和树状织物都是常见的，而亚高山带（1600-2200ma） （.sl）的主要特征是月乳沉积物，而在阿尔卑斯地区（2200ma.sl以上），如今没有形成鞘翅目。因此，化石针oth中的织物变化可潜在地用于重建温带气候喀斯特地区的MAT变化。版权所有（c）2015 John Wiley＆Sons，Ltd.

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