摘要
探明洞穴CO_2变化的影响因素对石漠化地区地下环境研究具有参考意义。在降雨条件下,对贵州石漠化地区石将军洞3个监测点的温度和CO_2浓度进行了每隔4 h一次的昼夜持续监测,分析降雨条件下石将军洞CO_2浓度变化特征及其影响因素。结果表明:受洞外环境变化影响,降雨期间石将军洞洞外与洞内气温变化规律一致,均表现出每日12∶00~18∶00时段气温偏高,0∶00~06∶00时段气温偏低,洞外气温均值高于洞内,洞外CO_2浓度均值低于洞内,气温与CO_2浓度变化幅度均大于洞内。降雨导致洞外CO_2浓度升高,洞内3个监测点CO_2的浓度表现出降雨后迅速降低,后续升高的变化特征。石将军洞上覆的地表石漠化效应促使岩层裂隙强烈发育,导致洞内快速响应洞外的环境变化;在降雨期间,石将军洞CO_2的浓度变化主要受到洞穴呼吸、土壤CO_2效应以及洞穴水脱气作用等因素综合影响。
It has crucial reference to explore the influence factors of cave CO2 variation for studying underground environment in rocky desertification area. The temperature and CO2 concentration of three monitoring sties had been monitored every four hours during rainfall in Shijiangjun cave,which locates in rocky desertification area,Anshun,Guizhou Province. Meanwhile,influence factors of rainfall on CO2 concentration variation were analyzed. The results revealed that： influenced by the environment change outside the cave,the temperature variation outside and inside the cave kept consistent during rainfall,their daily temperature were higher during 12 ∶ 00 18 ∶ 00 and were lower during 0 ∶ 00 06 ∶ 00. The mean value of temperature outside the cave was higher than that inside,the mean value of CO2 concentration was lower than that inside. Moreover,variations of temperature and CO2 concentration were greater than those inside rainfall led to the increase of CO2 concentration outside the cave,CO2 concentration of three sites in the cave showed continuous increase after rapid decrease after rainfall. The study suggests that the surface rocky desertification overlying Shijiangjun cave helps rock fractures for their intense development,result in rapid response of inside cave to the environment change outside the cave. Besides,CO2 concentration variation in cave during rainfall are mainly influenced by factors such as cave respiration,soil CO2 effect and degassing of dripwater.
作者
刘子琦
李开萍
LIU Ziqi;LI Kaiping(School of Karst Science,Guizhou Normal University,Guiyang,Guizhou 550001,China;State Engineering Technology Institute for Karst Desertification Control,Guiyang,Guizhou 550001,China)
出处
《贵州师范大学学报（自然科学版）》
CAS
2018年第4期13-17,共5页
Journal of Guizhou Normal University：Natural Sciences
基金
国家自然科学基金项目(41761104)
贵州师范大学2017年博士科研启动项目
关键词
石漠化
降雨
洞穴
CO2
rocky desertification
rainfall
cave
CO2
