ESTIMATION OF CARBON SINK IN SURFACE CARBONATE ROCKS OF GUANGXI PROVINCE BY USING REMOTE SENSING IMAGES

Abstract. Studies of the imbalance of source sinks in the carbon cycle show that CO₂ absorbed during rock weathering is part of the "miss carbon" of the global carbon cycle. The carbon sink contribution of carbonate rocks obviously plays a very important role in the absorption of atmospheric CO₂. Estimation of carbon sinks in karst dynamic system of Guangxi province has great significance for further understanding of global karst carbon cycle and global climate research. This paper quotes the rock data from Tao Xiaodong's paper, which is obtained using RS and GIS techniques. At the same time, the dissolution rate model studied by Zhou Guoqing and others was used to estimate the dissolution rate of carbonate rocks in Guangxi Province. Finally, the CO₂ content consumed by carbonate karstification in Guangxi Province was 1342910.447 t a^-1. The results obtained are in the same order of magnitude as the CO₂ content consumed by carbonate rock karstification in Guangxi Province calculated by Tao Xiaodong.