2012—2013年重慶雪玉洞洞穴系統(tǒng)碳循環(huán)特征
[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.
【作者單位】: 中國地質(zhì)科學(xué)院巖溶地質(zhì)研究所國土資源部廣西巖溶動力學(xué)重點實驗室;聯(lián)合國教科文組織國際巖溶研究中心;西南大學(xué)地理科學(xué)學(xué)院;中國科學(xué)院水利部成都山地災(zāi)害與環(huán)境研究所;
【基金】:國家自然科學(xué)基金項目(No.41103068) 中國地質(zhì)科學(xué)院基本科研業(yè)務(wù)費專項項目(No.2016005) 中國地質(zhì)調(diào)查局項目(No.DD20160285) 中央高校基本科研業(yè)務(wù)費專項項目(No.XDJK2015D003) 重慶市院士專項項目(No.CSTC2013jcyjys20001)
【分類號】:P59
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