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[1]AN Dan,ZHOU Zhongfa,FAN Baoxiang,et al.Air CO2 Concentration and Response of Dripping Water Chemistry to Cave Ventilation in Dafeng Cave of Guizhou Province[J].Research of Soil and Water Conservation,2020,27(06):338-345,352.

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Air CO₂ Concentration and Response of Dripping Water Chemistry to Cave Ventilation in Dafeng Cave of Guizhou Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 27 Number of periods: 2020 06 Page number: 338-345,352 Column: 目次 Public date: 2020-10-20

Title:: Air CO₂ Concentration and Response of Dripping Water Chemistry to Cave Ventilation in Dafeng Cave of Guizhou Province

Author(s):: AN Dan^1,2, ZHOU Zhongfa^1,2, FAN Baoxiang^1,2, XUE Bingqing^1,2, ZHU Cancan^1,2, SHI Liangxing^1,2; (1.College of Geography and Environmental Sciences/School of Karst Science, Guizhou Normal University, Guiyang 550001, China; 2.State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang 550001, China)

Keywords:: karst cave; ventilation effect; virtual temperature difference; CO₂ concentration; drip water chemistry

CLC:: P641.134; X142

DOI:: -

Abstract:: To explore the carbon cycle mechanism in the Karst Key Zone and reveal the response mechanism of the cave ventilation to the charge of environment. During the vacation of National Day of 2018, the 7-day continuous automatic monitoring on air environment index in tunnel(Temperature, Humidity, CO₂ concentration)and chemical index of dripping water(Temperature, pH value, EC, Ca²⁺, HCO^-₃)had been carried out in Dafeng Cave of Suiyang in Guizhou Province. The systemic analysis method was used to do a comprehensive analysis on the factors. The results showed that:(1)affected by the quantity of tourists and tunnel structures, there were obvious diurnal variation characteristics in air CO₂ concentrations of caves; compared with 2^#, 1^# located at the main tunnel of Dafeng Cave, has a large cavity and wide tunnel; the increasing range and changing range of CO₂ concentration in the air of caves decreased in the order: 2^#(shenquanyulu)>1^#(yemingzhu);(2)correlation between the effect of cave ventilation and the chemistry of cave dripping water was significant; the cave ventilation effect was negatively related to lgP_{CO_{_{_2(w)}}}, positively correlated with pH value, SIc and SId; influenced by the tunnel structures of monitoring point, cave ventilation effect and dripping water volume, cave ventilation were positively related to the concentration changes of Ca²⁺ and HCO^-₃ at 1^#, but the correlation in 2^# was not significant;(3)under different ventilation modes, there were differences in water vapor CO₂ partial pressure difference and deposition environment at different monitoring points; when ΔT_v>0, the cave will be positively ventilated and the CO₂ concentration in the air of caves will decline, ΔP_{CO_{_₂}}>0, it will be conducive to the deposition of cave landscape. On the contrary, cave sediments tend to produce dissolution.

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Last Update: 2020-10-20