2012—2013年重庆雪玉洞洞穴系统碳循环特征
发布时间：2019-02-25 19:14
【摘要】：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.
[Abstract]:The high concentration of CO_2 in Xueyu Cave in Chongqing is rare both at home and abroad, but the carbon cycle characteristics and control factors of the cave system are still unclear. Use of soil carbon dioxide partial pressure (P _ (CO_2-soil), hole) atmospheric carbon dioxide partial pressure (P _ (CO_2-cave),) underground river water carbon dioxide partial pressure (P _ (CO_2-eq), calcite saturation index) (SIc),) The dissolved inorganic carbon isotopes (未 ~ (13) CDIC) of underground river water are used to study the change of CO_2 concentration in Xueyu cave, the controlling factors and the influence of underground river on the carbon cycle in the cave. The results show that the overlying PCO_2-soil in Xueyu cave is high in rainy season and low in dry season, and rainfall is an important factor to control the overlying PCO_2-soil. The change rule of P( CO_2-cave) in Xueyudong is obvious, which is high in warm season and low in cold season; The change of temperature leads to the frequent flow exchange between inside and outside of the cave is an important reason for the sudden change of P_ (CO_2-cave). The CO_2 degassing of underground river water can raise the P( CO_2-cave) to a higher value in a short period of time. In rainy season, because of the CO_2 effect of soil, the underground river water has the characteristics of low SIc, and high PCO_2-eq, the mineralization degree is higher, and some of the underground river water has dissolution in some months. Due to the CO_2 effect of soil and less rainfall in dry season, the underground river water has the characteristics of high SIc, and lower P _ (CO_2-eq), the mineralization degree is lower, and the sediment is the main factor.
【作者单位】： 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;联合国教科文组织国际岩溶研究中心;西南大学地理科学学院;中国科学院水利部成都山地灾害与环境研究所;
【基金】：国家自然科学基金项目(No.41103068) 中国地质科学院基本科研业务费专项项目(No.2016005) 中国地质调查局项目(No.DD20160285) 中央高校基本科研业务费专项项目(No.XDJK2015D003) 重庆市院士专项项目(No.CSTC2013jcyjys20001)
【分类号】：P59
本文编号：2430453
[Abstract]:The high concentration of CO_2 in Xueyu Cave in Chongqing is rare both at home and abroad, but the carbon cycle characteristics and control factors of the cave system are still unclear. Use of soil carbon dioxide partial pressure (P _ (CO_2-soil), hole) atmospheric carbon dioxide partial pressure (P _ (CO_2-cave),) underground river water carbon dioxide partial pressure (P _ (CO_2-eq), calcite saturation index) (SIc),) The dissolved inorganic carbon isotopes (未 ~ (13) CDIC) of underground river water are used to study the change of CO_2 concentration in Xueyu cave, the controlling factors and the influence of underground river on the carbon cycle in the cave. The results show that the overlying PCO_2-soil in Xueyu cave is high in rainy season and low in dry season, and rainfall is an important factor to control the overlying PCO_2-soil. The change rule of P( CO_2-cave) in Xueyudong is obvious, which is high in warm season and low in cold season; The change of temperature leads to the frequent flow exchange between inside and outside of the cave is an important reason for the sudden change of P_ (CO_2-cave). The CO_2 degassing of underground river water can raise the P( CO_2-cave) to a higher value in a short period of time. In rainy season, because of the CO_2 effect of soil, the underground river water has the characteristics of low SIc, and high PCO_2-eq, the mineralization degree is higher, and some of the underground river water has dissolution in some months. Due to the CO_2 effect of soil and less rainfall in dry season, the underground river water has the characteristics of high SIc, and lower P _ (CO_2-eq), the mineralization degree is lower, and the sediment is the main factor.
【作者单位】： 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;联合国教科文组织国际岩溶研究中心;西南大学地理科学学院;中国科学院水利部成都山地灾害与环境研究所;
【基金】：国家自然科学基金项目(No.41103068) 中国地质科学院基本科研业务费专项项目(No.2016005) 中国地质调查局项目(No.DD20160285) 中央高校基本科研业务费专项项目(No.XDJK2015D003) 重庆市院士专项项目(No.CSTC2013jcyjys20001)
【分类号】：P59
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