[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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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:
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Air CO2 Concentration and Response of Dripping Water Chemistry to Cave Ventilation in Dafeng Cave of Guizhou Province
- Author(s):
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AN Dan1,2, ZHOU Zhongfa1,2, FAN Baoxiang1,2, XUE Bingqing1,2, ZHU Cancan1,2, SHI Liangxing1,2
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(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)
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- Keywords:
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karst cave; ventilation effect; virtual temperature difference; CO2 concentration; drip water chemistry
- CLC:
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P641.134; X142
- DOI:
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- Abstract:
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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 lgPCO2(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 ΔTv>0, the cave will be positively ventilated and the CO2 concentration in the air of caves will decline, ΔPCO2>0, it will be conducive to the deposition of cave landscape. On the contrary, cave sediments tend to produce dissolution.