Pedosphere 4(4): 297--306, 1994
ISSN 1002-0160/CN 32-1315/P
©1994 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Estimate of methane emission from rice paddy fields in Taihu Region, China |
| CAI Zu-Cong1, XU Hua1, ZHANG Han-Hui1 and JIN Ji-Sheng2 |
1 Institute of Soil Science, Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 (China)
2 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 closed chamber method in 1992 and 1993 and CH4 emission from this region (total area of paddy soils was about 1.88 million hectares, of which 0.63 million hectares are distributed in the south of Jiangsu Province) was estimated on the basis of the mean CH4 fluxes observed. The results showed that the mean CH4 flaxes from late rice and single cropping rice field were quite similar under the prevailing cultivation practices in the region, being around 5 mg CH4/m2/h (4.31-5.31 mg CH4/m2/h for various cultivars of the late rice and 3.20-6.22 mg CH4/m2/h for various treatments of the single cropping rice). Total CH4 emission from paddy soils in the region was estimated to be 0.185--0.359 Tg CH4 per year. Continuously flooding the soil with a 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 or soil Eh. |
| Key Words: methane, paddy soils, Taihu region |
| Citation: Cai, Z. C., Xu, H., Zhang, H. H. and Jin, J. S. 1994. Estimate of methane emission from rice paddy fields in Taihu Region, China. Pedosphere. 4(4): 297-306. |
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