Carbon cycle characteristics in karst cave system of Xueyu cave from 2012 to 2013

被引：1
|
作者：
Ren K. [1 ,2 ,3 ]
Shen L. [3 ]
Yuan D. [1 ,2 ,3 ]
Wang X. [4 ]
Xu S. [3 ]
机构：
[1] Institute of Karst Geology, Chinese Academy of Geological Sciences, Karst Dynamics Laboratory of Ministry of Land and Resources & Guangxi, Guilin
[2] International Research Center on Karst under the Auspices of UNESCO, Guilin
[3] School of Geographical Sciences, Southwest University, Chongqing
[4] Institute of Mountain Hazards and Environment, CAS, Chengdu
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2016年 / 41卷 / 08期
关键词：
Calcite saturation index; Carbon cycle; Climate change; CO[!sub]2[!/sub] partial pressure; Karst cave system; Xueyu cave;
D O I：
10.3799/dqkx.2016.113
中图分类号：
学科分类号：
摘要：
The high CO2 concentration in Xueyue cave, Chongqing, is rare at home and abroad. However, the circulation characteristics of carbon and its controlling factors in this cave system remain unknown. PCO2-soil, PCO2-cave, PCO2-eq, SIc, and δ13CDIC of subterranean stream were analyzed to investigate the laws of CO2 concentration variations in Xueyu cave and its contolling factors, as well as the impact on carbon cycle in this cave by subterranean stream. It is found that soil PCO2 mainly controlled by precipitation in subtropical areas was higher in rainy season than that of dry season. Cave air PCO2 exhibited seasonal variations, high cave air PCO2 typically occurred during warm periods, and low cave air PCO2 were typical of cold periods. It was ventilation driven by the temperature difference between cave and outside air that resulted in a sharp transition of cave air PCO2. Meanwhile, cave air PCO2 could rise to high level in a short period of time because of CO2 degassing from subterranean stream. Due to soil CO2 effect, groundwater became more mineralized water with low SIc and high water PCO2-eq, and dissolution in some months in rainy season. With the reduction of soil CO2 and precipitation, groundwater had low degree of mineralization with high SIc and low water PCO2-eq in dry season. © 2016, Editorial Department of Earth Science. All right reserved.
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页码：1424 / 1434
页数：10
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