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It is a key period to study the hydrochemistry of a cave stream during the storm events. In order to study the hydrochemistry variations and carbon sinks, the continuous monitoring of a stream in Xueyu cave was conducted during June 13-15. The hydrochemistry type of the stream was in a type of HCO3-Ca. The geochemistry parameters, such as pH, conductivity, and water temperature, reacted to rainfall quickly. The response time of hydrochemistry to the rainfall was about 4 hours. Even affected by the piston effect, the variations for conductivity, HCO3and Ca2+ were in negligible magnitudes during a prophase rainfall. The parameters of conductivity, HCO3and Ca2+ declined after the rainfall as a result of the dilution effect, and the variation of calcite saturation index was consistent with Ca2+. The water temperature rose from 16.50 °C to 16.58 °C due to the calefacient effect of the rainwater. Accompanied with the rise of the water temperature, the air temperature rose by 0.5°C. The carbon sinks of the studied cave stream were remarkable during the storm even, and the variations of partial pressure for CO2 showed a notable increase after the rainfall. The stock of DIC in the cave stream increased by 15191 kg, and the absorbed CO2 was 5479 kg during the storm event. Therefore, the role of cave stream in the carbon sinks should be paid more

Hydrochemistry Variations and Carbon Sinks of Cave Stream during a Storm Event