Hydrochemical variations of epikarst springs in vertical climate zones: a case study in Jinfo Mountain National Nature Reserve of China |
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| Authors: | Cheng Zhang Jun Yan Jianguo Pei Yongjun Jiang |
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| Institution: | (1) Karst Dynamics Laboratory, MLR, Institute of Karst Geology, CAGS, Guilin, 541004, People’s Republic of China;(2) Department of Geography and Geology, Western Kentucky University, Bowling Green, 42101, USA;(3) School of Geographic Sciences, Southwest China University, 1 Tiansheng Rd., Chongqing, 400715, People’s Republic of China |
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| Abstract: | High temporal resolution (15 min) measurements of stage, pH, electric conductivity, temperature, and other hydrochemical parameters
of groundwater at two sites in the Jinfo Mountain Nature Reserve of China were collected using automatic data loggers. Bitan
Spring (BS 700 m a.s.l.) sits in subtropical climate zone, while Shuifang Spring (SS 2,060 m a.s.l.) is located in plateau
temperate climate. The data show that hydrochemistry of epikarst springs at different altitudes is very sensitive to the changes
of their physical environment, especially two factors: air temperature and soil CO2 concentration. Springs at lower altitude are associated with higher air temperature and soil CO2 concentration, thus more likely leading to more active karst processes than those at higher elevation. Water temperature
and pH of BS showed a noticeable diurnal circle with high values in daytime and low values at night. The data also indicate
that at least there are two effects that could impact the variations of groundwater hydrochemistry during flood pulse: dilution
effect and CO2 effect. |
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