| 研究论文 |
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| Comprehensive Research on Development Characteristics of Loess Karst Spring |
| XIAO Jun1， ZHAO Jing-bo1,2 |
| 1.College of Tourism and Environment Science, Shaanxi Normal University, Xi’an 710062, China; 2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China |
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Abstract In order to find out the power of karst process and the law of loess karst spring further, we carried on the observation of loess karst spring twice a month in Yangwan Village of Chang’an County from June 2004 to June 2005. The result showed that: The change of pH value is between 6.89 and 7.38, the annual average number is 7.12, which has alkalescency characteristics. The conductivity change of the karst spring is between 634.36 and 758.27 s\5cm-1, the annual average number is 681.61 s\5cm-1. From June of this year to June next year, the pH value of loess karst spring demonstrated a law of “fall to rise then to fall” on the whole, but conductivity rate appeared the law of “high to low then to high again”. For details, the pH value fluctuated relatively heavily. The pH value and conductivity of karst spring are controlled by precipitation, temperature and CO2content. In summer and autumn, when water temperature, precipitation and the content of CO2 are high, the pH value is small and the conductivity is large. In winter and spring, when water temperature, precipitation and the content of CO2 are low, the pH value is large and the conductivity is small. From the change of pH value and conductivity rate, we learned that karst spring process is stronger in summer and autumn but weaker in winter and spring. Compared with limestone karst spring in Yudonghe, the spring water of loess karst spring flows more stably, its pH value is lower and conductivity rate is higher; besides, their daily changes are remarkable. The differentiation of water replenishment can answer for these diversities between loess karst spring and limestone karst spring: loess karst spring mainly supplied by membrane water, limestone karst spring mainly by gravity water and conduit water.
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Received: 09 August 2005
Published: 20 March 2006
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2006, Vol. 26 
