桂林峰丛洼地岩溶动力系统CO_2特征及变化规律  

Features of CO_2 Epi-Karst Dynamic System and Seasonal Change in Peak-Cluster Depression Area,Guilin

作　　者：夏青[1] 姜光辉[1] 李科[1] 申宏岗[1] 

机构地区：[1]中国地质科学院岩溶地质研究所

出　　处：《地质科技情报》2007年第5期79-82,共4页Geological Science and Technology Information

基　　金：新一轮国土资源大调查项目(1212010634805)

摘　　要：桂林岩溶水文地质试验场属于典型的峰丛洼地地区。峰丛洼地表层岩溶动力系统与土壤CO2密切相关,土壤CO2体积分数以及表层岩溶带土壤CO2溶蚀量的变化受气温和降雨影响。对不同部位不同深度的土壤CO2体积分数进行了野外监测,并利用多参数自动记录仪监测了泉水的水化学,揭示了CO2体积分数的变化规律。其变化特征表现为:①土壤CO2体积分数的季节变化在泉水水化学上和土壤CO2溶蚀量上均能反映出来;②土壤CO2体积分数的变化具有季节性;③50 cm处的CO2体积分数较20 cm处大;④土壤层对泉水水化学起到重要调蓄作用。A fixed position observation has been carried out in Guilin experimental site. It has been found that epi-karst dynamic system is related closely with CO2 content in soil and that temperature and rainfall dominate the seasonal change of CO2 content in soil. The observation of the CO2 concentration and hydrogeological temporal change in different sites and depths indicates： ①The seasonal change in soil CO2 concentration can be reflected from the hydrochemistry of spring and soil water;② The intensity of corrosion changes with soil CO2 concentration;③ Soil CO2 is larger in 50cm than in 20 cm;④ The karst dynamic processes in the epi-karst zone are sensitive to environmental changes, and hence can provide environmental information in a short time scale.

关 键 词：土壤CO2体积分数 岩溶作用 峰丛洼地 表层岩溶动力系统 

分 类 号：P641[天文地球—地质矿产勘探]