A category for estimate of CH 4 emission from rice paddy fields in China

摘要: Based on key factors influencing CH4 fluxes from rice paddy fields in China, a category for estimation of total emission was suggested and the constraints were discussed paper. Recently, measured situ have been built up dramatically with efforts both Chinese scientists those abroad. After reviewing published data fields, we found that although there are many other factors, water regime organic manure application two controlling emission; thus, China classified by these to estimate emission. In category, into mid-season aeration at least once during period growth (MSA), continuous flooding but well-drained after harvest (CFD), permanent (PF) even winter, fertilization mineral fertilizers only (MIN), amendment manures rate less than or equal 15 t ha-1 (MU 15), straw fresh plant materials (RS). Combining together, 12 types. The seasonal mean flux each type field calculated available showed lowest MSA-MIN, highest PF-MU > 15. estimated this 8.05 Tg yr-1 standard deviation 3.69 yr-1.