Estimate of Methane Emission from Rice Paddy Fieldsin Taihn Region, ChinaEnglish Full Text
CAI ZU-CONG; XU HUA; ZHANG HAN-HUI; and JIN JI-SHENG(Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 ( China)Agricultural Extension Station of Wuxian County, Suzhou 215007 (China))
Abstract: Methane fluxes from late rice and single cropping rice fields in Taihu region were measured using closedchamber method in 1992 and 1993 and CH4 emission from this region （total area of paddy soils was about1.88 million hectares, of which 0.63 million hectares are distributed in the south of Jiangsu Province） wasestimated on the basis of the mean CH4 fluxes observed. The results showed that the mean CH4 flaxes fromlate rice and single cropping rice field were quite similar under the prevailing cultivation practices in theregion, being around 5 mg CH4/m￣2/h （4.31-5.31 mg CH4/m￣2/h for various cultivars of the late rice and3.20-6.22 mg CH4/m￣2/h for various treatments of the single cropping rice）. Total CH4 emission from paddysoils in the region was estimated to be 0.185-0.359 Tg CH4 per year. Continuously flooding the soil witha water layer till ripening caused higher mean CH4 flux; and addition of nitrification inhibitor （thiourea）stimulated CH4 emission. There was no simple relationship between CH4 flux and either soil temperature orsoil Eh.
Keywords：
- Series：
(D) Agriculture
- Subject：
Fundamental Science of Agriculture
- Classification Code：
S19
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