again after MSA, methanogens started gradually with
rice soil redox potential declining. However, after a
break in the CH4 production process, CH4 emission
resumed, but did not peak as high as that during the
continuous flooding period. This agreed with the findings
in the above-mentioned previous studies, which
may be due to the fact that strong anaerobic conditions
could not develop under the water management of intermittent
irrigation (Cai et al., 1997). Interestingly,
CH4 emissions occurred continuously and reached the
peak during the early stage of MSA in 2010. A temporal
CH4 flush after drainage was previously attributed
to release of CH4 entrapped in the soil (Yagi et al.,
1996). In this study, CH4 concentration entrapped in
soil pore water in all the treatments reached peaks after
drainage, ranging from 9 to 30 μmol L−1 (data not
shown), which indicated that a significant CH4 pool
existed in the flooded soil.
again after MSA, methanogens started gradually with
rice soil redox potential declining. However, after a
break in the CH4 production process, CH4 emission
resumed, but did not peak as high as that during the
continuous flooding period. This agreed with the findings
in the above-mentioned previous studies, which
may be due to the fact that strong anaerobic conditions
could not develop under the water management of intermittent
irrigation (Cai et al., 1997). Interestingly,
CH4 emissions occurred continuously and reached the
peak during the early stage of MSA in 2010. A temporal
CH4 flush after drainage was previously attributed
to release of CH4 entrapped in the soil (Yagi et al.,
1996). In this study, CH4 concentration entrapped in
soil pore water in all the treatments reached peaks after
drainage, ranging from 9 to 30 μmol L−1 (data not
shown), which indicated that a significant CH4 pool
existed in the flooded soil.
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