摘要
岩溶洞穴空气CO_2变化影响次生沉积物沉积和溶蚀,它关系到洞穴旅游景观的稳定性及洞穴环境的舒适性,是岩溶作用发生的关键因素。本文以一个水文年监测数据为主,结合洞穴上、中、下垂直监测结果,分析了大风洞洞穴空气CO_2时空变化特征及其影响因素。结果表明:(1)在空间尺度上,越靠近洞口通风效应越强,洞穴空气CO_2浓度越低,越接近大气的CO_2浓度,当上升到一定阀值时,CO_2浓度基本保持稳定状态;(2)在长时间尺度,大风洞洞穴CO_2浓度表现为夏季>秋季>春季>冬季的一个变化趋势,夏季波动幅度较大,而冬季较为平缓;(3)在垂直尺度上,春、夏、秋季洞穴CO_2浓度、相对湿度差异大,且洞底部CO_2浓度和相对湿度大多高于洞顶部。越往洞穴深入,3个环境参数的垂直差异均减小;(4)影响因素上,大风洞CO_2主要受洞道结构及通风效应、洞穴上覆土壤环境、岩溶作用、旅游活动的影响,其中以岩溶作用最为突出。
The change of C〇2concentration afect tlie deposition and disolution of secondary sediments in Karstcaves,which is related to the stability of cave landscape and the comfort of cave environment,which is the keyfactor of Karst effect.Based on the data of whole hydrological year and the vertical monitoring results of cave C〇2,the tempoeal and spatial variation characteristics of cave C〇2and the influencing factors are analyzed.The results show that:①At the spatial scale,the closer to the entrance and exit of cave is the lower C〇2concentration whichafect by the ventilation.When the C〇2concentration rose to a certain threshold,the C〇2concentration is basically stable;②On the long time scale,the C〇2concentration of Dafeng cave show summer>autumn>spring and summer fluctuations more widely,while winter is more mild;③on the vertical scale,the difference of CO2concentration and relative humidity of spring,summer and autumn cave are significanly.And the CO2concentration and relative humidity at the bottom of cave are much higher than that at the top of cave.Further vertical differences of the three environmental parameters of the upper,middle and lower CO2of the cave are reduced;④On the influencing factors,the CO2concentration of Dafeng cave is mainly affected by the tunnel structure,ventilation condition,the overlying soil environment,karstification and tourism activities.And the karstification is the most important prominent.
作者
田衷珲
周忠发
张绍云
曹明达
张结
殷超
潘艳喜
汪炎林
Tian Zhonghui;Zhou Zhongfa;Zhang Shaoyun;Cao Mingda;Zhang Jie;Yin Chao;Pan Yanxi;Wang Yanlin(School of Karst Science, Guizhou NormaL University,Guiyang 550001,P. X China;State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001,P. R. China;School of Geographic and Environmental Sciences,Guizhou Normal University/Karst Research Institute,Guiyang 550001,P. X China)
出处
《科学技术与工程》
北大核心
2017年第33期43-51,共9页
Science Technology and Engineering
基金
国家自然科学基金(41361081)
贵州省重大应用基础研究项目(黔科合JZ字[2014]200201)
贵州省高层次创新型人才培养计划"百"层次人才(黔科合平台人才[2016]5674)
国家遥感中心贵州分布平台建设(黔科合计Z字[2012]4003)资助
