摘要
作为岩溶地下空间特有的窗口,洞穴CO_(2)通常较高且补给过程复杂,研究洞穴CO_(2)不仅有利于探明岩溶系统CO_(2)三相运移过程,对寻找遗漏碳汇也具有积极意义。为了研究不同季节下岩溶洞穴系统各层CO_(2)变化特征,揭示其迁移路径,进一步探究洞穴系统CO_(2)来源,对不同季节麻黄洞上覆土壤、洞穴滴水及洞穴空气CO_(2)进行密集监测,结合数理统计及相关模型对数据进行分析。结果表明:(1)麻黄洞洞穴系统各层CO_(2)存在雨季高旱季低的季节特征,作为主要补给源,土壤CO_(2)在各层CO_(2)变化中发挥重要的作用,通风效应影响洞穴CO_(2)浓度的变化。(2)pCO_(2)计算结果表明,麻黄洞内滴水点存在不同的补给过程,除上覆土壤CO_(2)补给外,还存在表层岩溶带的补给。(3)模型分析表明,麻黄洞洞穴滴水全年均处于脱气状态,使洞内发生沉积,形成洞穴沉积物。分析洞穴系统上各层CO_(2)运移特征,为寻找遗失碳汇以及岩溶地区碳循环研究提供科学参考。
As a unique window of karst underground space, the cave have high CO_(2)concentration which exist complex recharge process. The study of CO_(2)in caves is not only beneficial to the exploration of the three-phase CO_(2)migration process in karst system, but also has positive significance to the search for missing carbon sinks. In order to study the variation characteristics of CO_(2)in each layer of the karst cave system in different seasons, and to reveal its migration path and further explore the source of CO_(2)in the cave system, this study monitored a cave system(Mahuang Cave) involving the overlying soil, drip water, and air CO_(2)in different seasons, and analyzed the data with mathematical statistics and the related model. The results show that:(1)As a major source of replenishment, soil CO_(2)plays an important role in the CO_(2)variation in each layer of the cave system, and the ventilation effect affects the CO_(2)concentration in the cave.(2)The calculation of pCO_(2)show that there are different replenishment processes at the drip water in Mahuang Cave. The CO_(2)replenishment not only come from the overlying soil, but also from the surface karst zone.(3)According to the model, water drips are degassing all the year in Mahuang Cave, which results in the deposition and sediment formations. This study analyzes the CO_(2)transport characteristics in the cave system, which provides the basis for carbon cycle research in karst area and finds “missing carbon sink”.
作者
石亮星
周忠发
丁圣君
董慧
闫利会
张文辉
SHI Liangxing;ZHOU Zhongfa;DING Shengjun;DONG Hui;YAN Lihui;ZHANG Wenhui(College of Karst Institute/Geography and Environmental Science,Guizhou Normal University,Guiyang 550001,China;National Key Laboratory Breeding Base of Karst Mountain Ecological Environment in Guizhou Province,Guiyang 550001,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2021年第6期623-634,共12页
Earth and Environment
基金
贵州师范大学资助博士科研项目(GZNUD[2017]6号)
国家自然科学基金地区项目(41361081)
贵州省高层次创新型人才培养计划—“百”层次人才项目(黔科合平台人才[2016]5674)。
关键词
岩溶洞穴系统
碳迁移
水文地球化学过程
麻黄洞
karst cave system
carbon migration
hydrogeochemical process
Mahuang Cave
