Application of carbon isotope for discriminating sources of soil CO_2 in karst area, Guizhou

摘要

Using carbon isotope of soil CO_2 this paper discussed the sources of soil CO_2 in karst area, Province, china. Oxidation-decomposition of organic matter, respiration of plant root and activity of microbe are thought to be the mzjor sources of soil CO_2. However, in karst area, the contribution of dissolution of underlying carbonate rock to soil CO_2 should be considered as in acidic environment.