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2012—2013年重庆雪玉洞洞穴系统碳循环特征
Carbon Cycle Characteristics in Karst Cave System of Xueyu Cave from 2012to 2013

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任坤 1   沈立成 2   袁道先 1   王晓晓 3   徐尚全 2  
文摘 重庆雪玉洞洞内CO_2浓度之高,在国内外皆罕见,但此洞穴系统碳循环特征及控制因素仍不清楚.利用土壤二氧化碳分压(P_(CO_2-soil))、洞内大气二氧化碳分压(P_(CO_2-cave))、地下河水二氧化碳分压(P_(CO_2-eq))、方解石饱和指数(SIc)、地下河水溶解无机碳同位素(δ~(13) CDIC)等指标来研究雪玉洞洞内CO_2浓度变化、控制因素以及地下河对洞内碳循环的影响.结果表明:雪玉洞上覆P_(CO_2-soil)雨季高,旱季低;降雨量是控制上覆P_(CO_2-soil)的重要因子.雪玉洞P_(CO_2-cave)变化规律明显,暖季高,冷季低;温度变化导致洞内外气流频繁交换是P_(CO_2-cave)突变的重要原因,地下河水CO_2脱气能够在短时间内让P_(CO_2-cave)上升到较高值.雨季由于土壤CO_2效应,地下河水具有低SIc、高P_(CO_2-eq)特性,矿化度较高,并且部分月份地下河水具有溶蚀性;旱季由于土壤CO_2效应及降雨较少,地下河水呈现高SIc、低P_(CO_2-eq)特性,矿化度较低,以沉积为主.
其他语种文摘 The high CO_2 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.P_(CO_2-soil),P_(CO_2-cave),P_(CO_2-eq),SIc,and δ~(13) CDIC of subterranean stream were analyzed to investigate the laws of CO_2 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 P_(CO_2) mainly controlled by precipitation in subtropical areas was higher in rainy season than that of dry season.Cave air P_(CO_2) exhibited seasonal variations, high cave air P_(CO_2) typically occurred during warm periods,and low cave air P_(CO_2) 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 P_(CO_2).Meanwhile, cave air P_(CO_2) could rise to high level in a short period of time because of CO_2 degassing from subterranean stream.Due to soil CO_2 effect,groundwater became more mineralized water with low SIc and high water P_(CO_2-eq),and dissolution in some months in rainy season.With the reduction of soil CO_2 and precipitation,groundwater had low degree of mineralization with high SIc and low water P_(CO_2-eq)in dry season.
来源 地球科学 ,2016,41(8):1424-1434 【核心库】
DOI 10.3799/dqkx.2016.113
关键词 岩溶洞穴系统 ; 碳循环 ; 二氧化碳分压 ; 方解石饱和指数 ; 雪玉洞 ; 气候变化
地址

1. 中国地质科学院岩溶地质研究所, 国土资源部广西岩溶动力学重点实验室, 广西, 桂林, 541004  

2. 西南大学地理科学学院, 重庆, 400715  

3. 中国科学院水利部成都山地灾害与环境研究所, 四川, 成都, 610041

语种 中文
文献类型 研究性论文
ISSN 1000-2383
学科 地质学
基金 国家自然科学基金项目 ;  中国地质科学院基本科研业务费专项项目 ;  国土资源部中国地质调查局项目 ;  中央高校基本科研业务费专项资金 ;  重庆市院士专项项目
文献收藏号 CSCD:5778541

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引证文献 11

1 王世杰 中国南方喀斯特地区碳循环研究进展 地球与环境,2017,45(1):2-9
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2 吴泽燕 岩溶关键带及其碳循环研究进展 地球科学进展,2019,34(5):488-498
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