Emission Flux and Carbon Isotopic Composition of Methane from Rice Paddies in Guizhou Province

摘要

Methane emission flux from rice paddies in Guizhou Province shows obvious three-stage diurnal variations: it is relatively low from the morning to the noon, then successively in-creases in the afternoon and at night, and finally folows a gradual decrease. Theδ13C values oftrace methane emitted from rice paddies in Guizhou Province range from-64. 5‰. to - 54.1‰ with an average of - 60. 7‰, very close to the reported values from America or Kenya.