YU Shi1，WANG Ao-yu1,2，YANG Hui1，YAN Yi-ping3，ZHANG Chun-lai1
（1. Institute of Karst Geology,CAGS, Karst Dynamics Laboratory ,MLR, Guilin541004, China;
2.Department of Earthquake Damage Prevention, Sichuan Provincial Seismological Bureau ,Chengdu610041, China;
3. Life Sciences Institute, Guangxi Normal University , Guilin541004, China）
Abstract: In order to give insight into the reaction between acid rain and carbonate rock surface, and figure out the CO2 carbonate source amount from the processes of acid rain-induced chemical weathering of carbonate rocks, two typical carbonate rock areas Guilin (representing a limestone area) and Liuzhou (representing a 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 CO2 source produced by acid rain was 41.066×108g/a, with 33.349×108g/a for Guilin and 7.717×108g/a for Liuzhou. The carbon sources of unit areas in Guilin and 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 are two reasons to explain why the degassing rate of carbon source in Guilin is lower than that in Liuzhou. One is the representative area of carbonate rock in Guilin , where the degassing rate is 2.77 times that in Liuzhou, and the other one is that the total intensity of acid rain in Guilin is lower than in Liuzhou, so the dissolution rate of the carbonate rocks is lower in Guilin.
Key words: acid rain; carbon source；carbonate rock
EARTH AND ENVIRONMENT Vol. 40, No.1, Tot No.287, 2012, Page 44-49
