Impacts of Climate Changes on Hydrologic Regimes and Water Resource in Chongqing Karst Ecosystem

In this paper,the impacts of climate changes on karst ecosystem were studied from the aspects of hydrologic regimes and water resource,taking karst areas in Chongqing as an example.Integrating hydrology data and weather data,the impacts of temperature and precipitation on elements of water resource were studied using mathematics analysis methods.Some results were obtained:precipitation change had great influence on runoff,showing dramatic positive correlation.With precipitation decreasing,runoff descended.Furthermore,precipitation change brought the result that droughts,floods and normal years occurred by turns,and durative time of droughts and floods was long.In Chongqing karst region,air temperature is an important factor of affecting evaporation.Potential evaporation brought seasonal change and annual change obviously with temperature change.With Temperature ascending,evaporation increased,or else decreased.In space,generally evaporation in the west was higher than in the east,evaporation in the north was higher than in the south.

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