Research on Carbon Source Effect of Guangxi Typical Carbonate Rock Area by Acid Rain

Abstract

In order to have an insight into the reaction between acid rain and carbonate rock surface, and figure out the CO2carbonate source amount from the acid rain chemical weathering process of the carbonate rocks, two typical carbonate rock areas Guilin (represents limestone area) and Liuzhou (represents dolomite area) were chosen as the study areas in Guangxi. According to the dissolution rate calculated by the limestone test piece and GIS analysis, the CO2source produced by the acid rain was 41.066×108g/a, in which Guilin was 33.349×108g/a and Liuzhou was 7.717×108g/a. The carbon sources of unit area in Guilin and in Liuzhou were 66.967×105g/a•km2 and 42.777×105g/a•km2 respectively. Although the carbon sources were still less than their carbon sinks in Guilin and Liuzhou which were 273.891×105g/a•km2 and 43.660×105g/a•km2 respectively, they should not be neglected. There were two reasons that the degassing rate of carbon source in Guilin was slower than that in Liuzhou. One was the representative area of carbonate rock in Guilin were 2.77 times of that in Liuzhou, the other one was that the total intensity of acid rain of Guilin was lower than Liuzhou, so that the dissolution rate of the carbonate rocks was lower in Guilin.