Analysis on carbon fixation potentiality of rocky desert land— A case in Guizhou

Five blocks of typical rocky desert in the most serious rocky desertification region in South China, Guizhou Province, are selected as the research object in the paper. The present carbon reserves in the rocky desert land in Guizhou is estimated and the carbon fixation potentialities within 20 years and 60 years are forecast with monitoring data on the spot in 70 typical sample plots.The data show that the total carbon storage in rocky desertification area add up to 126.27～204.18×106 ton in 2006, and the potential and slight rocky desertification land is the main carbon tank, where accounting for more than 80% of the total carbon storage; through comprehensive eco-treatment, about 226.55×106 ton CO2 will be fixed in 20 years, and the amount will double in the following 50 years, reaching 427.08×106 ton CO2. The annual carbon fixation capacity for desertification land is up to （8.55～11.34）×106t in Guizhou Province, which can offset 42% industry carbon emission of the whole province, Thus rocky desertification control is helpful to achieve the goal of carbon zero emission. So it is necessary to reconsider the carbon convergent function of rocky deserts control in the forthcoming comprehensive eco-treatment during “the 12th Five-Year Plan”.