CH_4 Emission Characteristics of Yellow-mud Field under Long-term Fertilization in Southern China and Its Greenhouse Effect

By using the method of static chamber-gas chromatography, CH4 emission from yellow-mud field under long-term fertilization in southern China was observed. The results showed that CH4 emission from paddyfield under different fertilization conditions all represented the same variation trend that increasing at the beginning and declining later on, and the emission peak appeared in the rice tillering stage; the fertilization promoted CH4 emission from paddyfield, in comparison with CK, seasonal CH4 cumulative emission under fertilization treatments increased by 22.3~74.2 kg/hm2 with the increasing range of 17.4%~58.0%, among all of the fertilization treatments, the CH4 emission from paddyfield under treatment of chemical fertilizer + organic fertilizer was significantly higher than single application of N, P and K, but the difference between NPKM treatment and NPKS treatment was not obvious; compared with no fertilization, the contribution of fertilization treatments to greenhouse effect reached 1.18~1.58 times.