摘要
ＥｓｔｉｍａｔｅｏｆＭｅｔｈａｎｅＥｍｉｓｓｉｏｎｆｒｏｍＲｉｃｅＰａｄｄｙＦｉｅｌｄｓｉｎＴａｉｈｎＲｅｇｉｏｎ，ＣｈｉｎａＣＡＩＺＵ－ＣＯＮＧ；ＸＵＨＵＡ；ＺＨＡＮＧＨＡＮ－ＨＵＩ；ａｎｄＪＩＮＪＩ－ＳＨＥＮＧ（ＩｎｓｔｉｔｕｔｅｏｆＳｏｉｌＳｃ...
Methane fluxes from late rice and single
cropping rice fields in Taihu region were measured using closedchamber method in 1992 and
1993 and CH_4 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 CH_4 fluxes observed. The results showed that the
mean CH_4 flaxes fromlate rice and single cropping rice field were quite similar under the
prevailing cultivation practices in theregion, being around 5 mg CH_4/m￣2/h (4.31-5.31 mg
CH_4/m￣2/h for various cultivars of the late rice and3.20-6.22 mg CH_4/m￣2/h for various
treatments of the single cropping rice). Total CH_4 emission from paddysoils in the region was
estimated to be 0.185-0.359 Tg CH_4 per year. Continuously flooding the soil witha water layer
till ripening caused higher mean CH_4 flux; and addition of nitrification inhibitor
(thiourea)stimulated CH_4 emission. There was no simple relationship between CH_4 flux and
either soil temperature orsoil Eh.
