The effect of soil oxygen availability on greenhouse gases emission in a double rice field

Xiaobo, 秦晓波 Qin; Yu'e, 李玉娥 Li; Yunfan, 万运帆 Wan; Qingzhu, 高清竹 Gao; Yong, 李勇 Li; Shengwei, 石生伟 Shi; Yulin, 廖育林 Liao; Meirong, 范美蓉 Fan; Chao, 许超 Xu

doi:10.5846/stxb201304110682

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“…The soil in Sanjiang Plain is characterised as black soil (Chernozem) and has a weakly acidic pH value (table 2). The typical redox value of the paddy field was in the range +300 to −200 mV [19]. The tested rice variety was LongJing 31.…”

Section: Site Descriptionmentioning

confidence: 99%

Methane emissions from typical paddy fields in Liaohe Plain and Sanjiang Plain, Northeast China

Jia

Zhou

et al. 2019

Environ. Res. Commun.

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Methane is one of the most important greenhouse gases and is emitted from waterlogged rice regions. Eddy covariance was used to obtain long-term (2017-2018), high-frequency data for the CH 4 flux at typical rice paddy fields in Sanjiang Plain and Liaohe Plain. This study examines the CH 4 emission process, emission characteristics at different time scales and the intensity of different emission sources. The relationships between CH 4 emissions and temperature and photosynthetically active radiation were also analysed. CH 4 emissions from Sanjiang Plain and Liaohe Plain in 2017 were 26.77 and 16.17 g CH 4 m −2 year −1 , respectively. The CH 4 fluxes in 2017 and 2018 were similar; emissions were higher at the Sanjiang site in 2018. Peak CH 4 emissions (daily average: 0.127 μmol CH 4 m −2 s −1 ) corresponded to the tillering stage in Sanjiang Plain. CH 4 emissions peaks corresponding to the jointing-heading and mature stages at Liaohe Plain. Monthly CH 4 emissions were highest in July. The daily averaged flux was 0.065 μmol CH 4 m −2 s −1 during the growing season. The field-transplanting stage exhibited the highest CH 4 emissions. No CH 4 was emitted during the greening-tillering stages. Emissions increased again during the jointing-heading stages to 0.102 μmol CH 4 m −2 s −1 , and then decreased gradually. A significant linear correlation was observed between PAR and the methane flux in Liaohe Plain. CH 4 emissions in Sanjiang Plain were more sensitive to changes in temperature. The temperature coefficient value was highest from the sowing period to the green period. The CH 4 flux at Sanjiang Plain depended on the stage of rice growth, the temperature, the degree of irrigation and drainage, and the soil pH. In November (during the non-growing season) at Liaohe Plain, a slight negative flux (a weak CH 4 sink) was observed. CH 4 emissions were also found to be inhibited in the growing season by increased soil alkalinity.

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Section: Site Descriptionmentioning

confidence: 99%

Methane emissions from typical paddy fields in Liaohe Plain and Sanjiang Plain, Northeast China

Jia

Zhou

et al. 2019

Environ. Res. Commun.

View full text Add to dashboard Cite

show abstract

The effect of soil oxygen availability on greenhouse gases emission in a double rice field

Abstract: The effect of soil oxygen availability on greenhouse gases emission in a double rice field.Acta Ecologica Sinica,2013,33(18) :5546鄄 5555.

Cited by 1 publication

References 0 publications

Methane emissions from typical paddy fields in Liaohe Plain and Sanjiang Plain, Northeast China

Methane emissions from typical paddy fields in Liaohe Plain and Sanjiang Plain, Northeast China

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