RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (05): 747-754.doi: 10.11870/cjlyzyyhj201705012

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ANALYSIS ON HYDROCHEMICAL VARIATIONS OF EPIKARST SPRING IN SOUTHEAST YUNNAN PEAK FOREST-LAKE BASIN

YIN Ji-qing, FAN Tao, YAN Peng   

  1. College of Tourism and Geography Science, Yunnan Normal University, Kunming 650500, China
  • Received:2016-10-14 Revised:2017-01-03 Online:2017-05-20
  • Supported by:
    National Natural Science Foundation "Study on the Mechanism of Water Exhaustion of Peak Forest-Lake Basin in the East of Yunnan Karst Plateau"(41261007);National Natural Science Foundation "Study on the Restoration Mechanism of Water-Production Function of Pinus Yunnanensis Water-Source Forest In The East Of Yunnan Karst Plateau"(41661004)

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Abstract: In order to explore the hydrochemical change and its influencing factors of epikarst zone under human disturbances in the Southeast Yunnan peak forest-lake basin, we investigated physical and chemical properties of the two spring area in a hydrological year. Results showed that for the Caihuaqing spring, seasonal dynamics of physicochemical indicators had a large amplitude. The water temperature was 4.6 degrees Celsius, the conductivity was 302 μs/cm, pH was 0.66, water turbidity was 255.1. For the Huobadong spring, the seasonal dynamics of the physical and chemical indicators had relatively small variations. The water temperature was 3.3 degrees Celsius, the conductivity was 225μs/cm, pH was 0.5, water turbidity was 9.8. Under normal weather conditions, air temperature and water temperature, conductivity and pH were positively correlated for the Caihuaqing spring. While for the Huobadong spring, air temperature and water temperature were positively correlated, but water temperature was negatively correlated with conductivity and pH. Under the condition of heavy rainfall, the Caihuaqing spring presented peaks of water temperature, conductivity and turbidity while low pH value at the early stage of rainfall. At the late stage of rainfall, the conductivity increased significantly in 6 hours from 189μs/cm to 405 μs/cm, and then maintained a stable upward trend, pH showed a downward trend after the peak. The relationship between water temperature and conductivity, pH was positively correlated with the water temperature in the Huobadong spring, which showed the peak during the period. After 10 hours of rainfall duration, pH and electrical conductivity showed a downward trend. Under the condition of weak rainfall, the Caihuaqing spring and Huobadong spring presented small amplitudes of physicochemical variations. At the early, middle and late stages of rainfall, pH and conductivity of the two springs appeared dilution effect curves.

Key words: epikarst zone, southeast Yunnan peak forest-lake basin, epikarst spring, hydrochemical

CLC Number: 

  • K903
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