FANG Baoxiang1,2, ZHOU Zhongfa1,2*, XUE Bingqing1,2, TANG Yuntao1,2, ZHU Cancan1,2, WANG Yanlin1,2, AN Dan1,2
(1. School of Karst Science/College of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, 550001, China;
2.The State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang ,550001, China;)
Abstract: Through the continuous monitoring of temperature, CO2 concentration, relative humidity and tourist volume in the first week of October in years 2017 and 2018, this study collected and analyzed above monitoring data systematically. The results showed that: (1) during the monitoring period, due to the ventilation effect of the cave and the amount of tourists, the air environment factors (temperature, humidity, CO2 concentration) of the Dafeng Cave showed the obvious diurnal change of day > night; (2) the cave structure has important influences on the spatial change of air environment factors of the cave, for example, temperature, humidity and CO2 concentration of the Shenquanyulu site were higher than those of the Yemingzhu site since the structure of the Shenquanyulu site is more complicated than that of the Yemingzhu site; (3) the change of air environment outside the cave influence significantly on the ventilation effect of the cave, for example, the airflow in the cave changed from the restrictive ventilation mode to the active ventilation mode during rainfalls, which reduced temperature and humidity outside the cave; (4) as the result of climate and tourist number factors, diurnal variations of temperature and CO2 concentration in the cave were more severe in 2017 than in 2018. When CO2 generated by tourists exceeds the self-purification capacity of the cave, CO2 will be accumulated in the cave and the cave tourism landscape and the comfort of the cave environment will be deteriorated. Therefore, it is recommended that impacts of tourism activities during the peak period should be considered carefully for protecting the karst landscape of the scenic spot.
Key words: Short-time scale; High intensity tourism activities; cave air environment; influencing factors; Dafeng cave
EARTH AND ENVIRONMENT Vol.48, No.1, Tot No.333, 2020, Page 46-57