The Dynamic Response of Carbon Sink to Rainfall in Karst Area - A Case Study from Maocun Karst Ecosystem

Abstract

Because of global warming, research on carbon sink is increasingly gaining international attention, there are 1.3 GtC/year unknown sink in the continental biosphere. In this study, we will present the high-resolution data of the DIC(DIC=H2CO3+HCO3−+CO32−), pH, and Pco2(carbon dioxide partial pressure) measured during the storm scale of Maocun subterranean river in Guilin on June 13-17,2010, which shows a high response to the rainfall. Though monitoring the rainfall, water level, water temperature, PH, Ec(electrical conductivity) and calculating of SIc (saturation index) and Pco2, to analyze the dynamic behaviors of DIC and discharge in storm scale. Studies suggest that DIC, pH, SIc and PCO2 are highly sensitive to rainfall, Discharge obviously increases after precipitation and changes with the rainfall intensity. According to the comparision of carbon sink between March 7, 2010 and June 13, 2010 of Maocun subterranean river, the data presents that carbon sink is obviously increased. Furthermore, carbon sink changes with different seasons, the result shows that rainy season 's carbon sink is larger than dry season, the research presents that pecipitation is an important factor in influencing the karst carbon sink potential.