Effects of water regime during rice-growing season on annual direct N2O emission in a paddy rice–winter wheat rotation system in southeast China

Liu, Shuwei; Qin, Yan; Liu, Qiaohui

doi:10.1016/j.scitotenv.2009.11.002

Cited by 147 publications

(70 citation statements)

References 30 publications

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“…Previous studies demonstrated that soils with coarse texture and high pH tended to have low soil N 2 O emissions (Bouwman et al, 2002;Stehfest and Bouwman, 2006). Thus, the lower EF d values in our study can be explained by the higher soil pH values (8.5 vs. 6.5-6.7), which likely favors that denitrification ends with N 2 rather than with N 2 O as the end-product (Groffman et al, 2009), and lower soil clay contents (13.4% vs.51-54%) than the experimental sites of Zou et al (2005a) and Liu et al (2010).…”

Section: N 2 O Emissionmentioning

confidence: 49%

Nitrous oxide and methane emissions from a subtropical rice–rapeseed rotation system in China: A 3-year field case study

Zhou

Zhu

Brüggemann

et al. 2015

Agriculture, Ecosystems & Environment

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Section: N 2 O Emissionmentioning

confidence: 49%

Nitrous oxide and methane emissions from a subtropical rice–rapeseed rotation system in China: A 3-year field case study

Zhou

Zhu

Brüggemann

et al. 2015

Agriculture, Ecosystems & Environment

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“…However, the seedling stage N 2 O emissions were comparable to those (0.50-0.62 kg N ha −1 ) of the rice-growing season with midseason drainage Zhao et al 2009) and those (0.12 kg N ha −1 ) under continuous waterlogging . The average annual cumulative N 2 O emissions with similar management practices were calculated to be 3.2 kg N ha − 1 and ranged from 0.50 to 11.29 kg N ha −1 Cao et al 1999;Chen et al 2005Chen et al , 2007Li et al 2009;Liu et al 2010;Ma et al 2009;Xu et al 1997;Zhang et al 2010;Zhao et al 2009;Zou et al 2005a, b;Zou et al 2009). The cumulative N 2 O emissions ranged from 0.07 to 0.62 kg N ha −1 over the rice seedling stage in this study and these values were significantly (P<0.05) lower than the cumulative average emission for the entire rice-growing season ( Table 2).…”

Section: Results and Analysismentioning

confidence: 99%

Greenhouse gas emissions during the seedling stage of rice agriculture as affected by cultivar type and crop density

Wang

Zhou

et al. 2012

Biol Fertil Soils

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Methane (CH 4 ) and nitrous oxide (N 2 O) emissions from a paddy nursery at the rice seedling stage were measured on a daily basis by using the conventional rice cultivar Nangeng 56 under both conventional (NG-C) and reduced (NG-R) sowing density, and the hybrid rice Changyou 3 under both conventional (CY-C) and reduced (CY-R) sowing density. High N 2 O and CH 4 emissions were observed during the first and last 2 weeks, respectively. Cumulative CH 4 emissions were significantly (P < 0.001) affected by sowing density rather than by the rice cultivar. Cumulative CH 4 emissions reached 68.2 kg C ha −1 in the CY-C treatment and 121.6 kg C ha −1 in the NG-C treatment, which were significantly (P<0.001) higher than the emissions at reduced sowing densities (15.9 kg C ha −1 in the CY-R treatment and 20.9 kg C ha −1 in the NG-R treatment). Under the conventional sowing density, cumulative CH 4 emissions during the seedling stage were comparable to data of ricegrowing season. Both the rice cultivar and the sowing density significantly (P<0.05-0.01) affected cumulative N 2 O emissions. Relative to the CY cultivar, the NG cultivar increased global warming potential (GWP) over a 100-year horizon by 62.1% and 70.7% under the reduced and conventional sowing densities, respectively. The GWP of N 2 O and CH 4 during the seedling stage was equivalent to the GWP of the entire ricegrowing season in this region, indicating that the seedling stage is an important greenhouse gas emission source of rice agriculture.

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“…Nevertheless, the assumption that TI fields are more environment-friendly than CI fields is misleading. The (Akiyama et al 2005;Liu et al 2010;Yan et al 2003;Zheng et al 2004), especially in the rice-winter wheat rotation system (Liu et al 2010). The water status of paddy fields during the rice growth period affects the N 2 O emissions during the subsequent non-rice season.…”

Section: Research Prospectsmentioning

confidence: 99%

“…N 2 O emissions from paddy fields are negligible in continuously flooded rice paddies (Cai et al 1997;Smith and Patrick 1983;Zou et al 2005a). Midseason drainage, also called sun-baking or sun-drying in China (Mao 1996), as well as alternate wetting and drying in paddy fields result in substantial N 2 O emissions (Cai et al 2001;Johnson-Beebout et al 2009;Liu et al 2010;Smith and Patrick 1983;Zou et al 2005b). However, few studies have been dedicated to quantifying N 2 O emissions from CI paddy fields.…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide emissions from paddy fields under different water managements in southeast China

Peng

Hou

et al. 2011

Paddy Water Environ

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Water management is recognized as one of the most important factors in regulating nitrous oxide (N 2 O) emissions from paddy fields. In China, controlled irrigation (CI) is widely applied because it has been proved highly effective in saving water. During the rice-growing season, the soil in CI paddy fields remains dry 60-80% of the time compared with soil irrigated by traditional methods. This study aims to assess N 2 O emissions from paddy fields under CI, with traditional irrigation (TI) as the control. The cumulative N 2 O emission from CI paddy fields was 2.5 kg N ha -1 , which was significantly greater than that from TI paddy fields (1.0 kg N ha -1 ) (P \ 0.05). Soil drying caused substantial N 2 O emissions. The majority (73.9%) of the cumulative N 2 O emission from CI paddy fields was observed during the drying phase, whereas no substantial N 2 O emissions were observed when the soil was re-wetted after the drying phase. More and significantly higher peaks of N 2 O emissions from CI paddy fields (P \ 0.05) were also detected. These peaks were observed *8 days after fertilizer application at water-filled pore spaces (WFPS) ranging from 78.0 to 83.5%, soil temperature ranging from 29.1 to 29.4°C, and soil redox potential (Eh) values ranging from ?207.5 to ?256.7 mV. The highest N 2 O emission was measured 8 days after the application of base fertilizer at a WFPS of 79.0%, soil temperature of 29.1°C, and soil Eh value of ?207.5 mV. These results suggest that N 2 O emissions may be reduced obviously by keeping the WFPS higher than 83.5% within 10 days after each fertilizer application, especially when the soil temperature is suitable.

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Effects of water regime during rice-growing season on annual direct N2O emission in a paddy rice–winter wheat rotation system in southeast China

Cited by 147 publications

References 30 publications

Nitrous oxide and methane emissions from a subtropical rice–rapeseed rotation system in China: A 3-year field case study

Nitrous oxide and methane emissions from a subtropical rice–rapeseed rotation system in China: A 3-year field case study

Greenhouse gas emissions during the seedling stage of rice agriculture as affected by cultivar type and crop density

Nitrous oxide emissions from paddy fields under different water managements in southeast China

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