摘要
利用CTDP300多参数自动记录仪对重庆金佛山国家级自然保护区碧潭泉和水房泉的降雨量、水位、水温、pH值、电导率进行了监测。结果表明,不同海拔高度的表层岩溶泉水化学对环境变化十分敏感,且具不同的表现形式,气温和土壤CO2浓度是引起水化学动态变化的两个重要因子。位于海拔较低的碧潭泉气温,土壤CO2浓度相对较高,岩溶作用也相对强,位于海拔较高的水房泉则相对较弱。受气温控制,前者的水温、pH表现出明显的白天高,夜间低的昼夜变化规律。降雨过程中,至少有两种效应在影响水化学性质:雨水的稀释效应和CO2效应,前者对碧潭泉水化学变化影响较大,降雨可引起泉水电导率、水温及pH的显著下降,降雨强度越大,下降速度与幅度越大,而从泉水电导率下降、pH值略有上升看,两者均对水房泉的水化学变化产生了影响。
Using data loggers recording with 15 minutes resolution, the authors made high resolution measurements of such groundwater parameters as the stage, pH, conductivity, temperature, and hydrochemistry at two locations within the vertical zoned climate region of the Jinfo Mountain Nature Reserve in Chongqing. The Bitan spring 700m a.s.l. represents subtropic climate, while the Shuifang spring 2000m a.s.l. represents plateau temperate climate. The results show that hydrochemical parameters of epikarst springs at different altitudes seem very sensitive to environmental change and are mainly controlled by two factors: air temperature and soil CO2 concentration. Lower altitude means higher air temperature and CO2 concentration, thus more active karst processes. Water temperature and pH of the Bitan spring show a remarkable diurnal variation with high value in the day and low value at night. During flood pulse, there are at least two effects influencing hydrochemistry of groundwater: dilution effect and CO2 effect. As a result, the pH of the Bitan spring drops while the conductivity falls. At the same time, the pH of the Shuifang spring rises, while the conductivity falls. These phenomena may indicate that the Bitan spring represents conduit-fissure flow and the Shuifang spring represents fissure media.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2006年第5期510-514,共5页
Acta Geoscientica Sinica
基金
中国博士后科学基金项目(编号:2005038473)
国家自然科学基金项目(编号:40231008
90202016)
国土资源部岩溶动力学重点实验室及西南大学地理科学学院博士点基金项目联合资助。
关键词
岩溶动力系统
水化学变化
垂直气候分带
重庆金佛山
karst dynamic system hydrochemical variation vertical zoned climate Jinfo Mountain in Chongqing
作者简介
章程,1965年生,男,博士,研究员.现为西南大学地理科学学院博士后,主要从事岩溶生态环境、水文地质与土地利用等方面的研究;电话:0773-5837343;讯地址:541004,广西桂林市七星路50号;E-mail:chzhang@karst.edu.cn.
