Greenhouse gas emissions as affected by different water management practices in temperate rice paddies

Peyron, Matteo; Bertora, Chiara; Pelissetti, Simone; Said-Pullicino, Daniel; Celi, Luisella; Miniotti, Eleonora Francesca; Romani, Marco; Sacco, Dario

doi:10.1016/j.agee.2016.07.021

Cited by 88 publications

(56 citation statements)

References 35 publications

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“…In accordance with results from past studies Peyron et al, 2016;Cai et al, 1997) and in line with our hypothesis, we observed higher N 2 O emissions on most days in the DS-AWD relative to the two WS treatments (Fig. 2).…”

Section: Patterns Of N 2 O Emitted N 2 O Poreair and N 2 O Isotope supporting

confidence: 93%

Early season N<sub>2</sub>O emissions under variable water management in rice systems: source-partitioning emissions using isotope ratios along a depth profile

Verhoeven

Barthel

et al. 2019

Biogeosciences

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Abstract. Soil moisture strongly affects the balance between nitrification, denitrification and N2O reduction and therefore the nitrogen (N) efficiency and N losses in agricultural systems. In rice systems, there is a need to improve alternative water management practices, which are designed to save water and reduce methane emissions but may increase N2O and decrease nitrogen use efficiency. In a field experiment with three water management treatments, we measured N2O isotope ratios of emitted and pore air N2O (δ15N, δ18O and site preference, SP) over the course of 6 weeks in the early rice growing season. Isotope ratio measurements were coupled with simultaneous measurements of pore water NO3-, NH4+, dissolved organic carbon (DOC), water-filled pore space (WFPS) and soil redox potential (Eh) at three soil depths. We then used the relationship between SP × δ18O-N2O and SP × δ15N-N2O in simple two end-member mixing models to evaluate the contribution of nitrification, denitrification and fungal denitrification to total N2O emissions and to estimate N2O reduction rates. N2O emissions were higher in a dry-seeded + alternate wetting and drying (DS-AWD) treatment relative to water-seeded + alternate wetting and drying (WS-AWD) and water-seeded + conventional flooding (WS-FLD) treatments. In the DS-AWD treatment the highest emissions were associated with a high contribution from denitrification and a decrease in N2O reduction, while in the WS treatments, the highest emissions occurred when contributions from denitrification/nitrifier denitrification and nitrification/fungal denitrification were more equal. Modeled denitrification rates appeared to be tightly linked to nitrification and NO3- availability in all treatments; thus, water management affected the rate of denitrification and N2O reduction by controlling the substrate availability for each process (NO3- and N2O), likely through changes in mineralization and nitrification rates. Our model estimates of mean N2O reduction rates match well those observed in 15N fertilizer labeling studies in rice systems and show promise for the use of dual isotope ratio mixing models to estimate N2 losses.

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Section: Patterns Of N 2 O Emitted N 2 O Poreair and N 2 O Isotope supporting

confidence: 93%

Early season N<sub>2</sub>O emissions under variable water management in rice systems: source-partitioning emissions using isotope ratios along a depth profile

Verhoeven

Barthel

et al. 2019

Biogeosciences

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“…The development of effective mitigation strategies aimed at minimizing the global warming potential of rice cropping systems must therefore consider the emissions of both gases [20]. Water management strategy is one of the most promising options for GHG mitigation from paddy rice production.…”

Section: Introductionmentioning

confidence: 99%

Mitigation Potential and Yield-Scaled Global Warming Potential of Early-Season Drainage from a Rice Paddy in Tamil Nadu, India

Sudo

Inubushi

et al. 2018

Agronomy

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Water-intensive systems of rice cultivation are facing major challenges to increase rice grain yield under conditions of water scarcity while also reducing greenhouse gas (GHG) emissions. The adoption of effective irrigation strategies in the paddy rice system is one of the most promising options for mitigating GHG emissions while maintaining high crop yields. To evaluate the effect of different alternate wetting and drying (AWD) irrigation strategies on GHG emissions from paddy rice in dry and wet seasons, a field experiment was conducted at the Tamil Nadu Rice Research Institute (TRRI), Aduthurai, Tamil Nadu, India. Four irrigation treatments were included: One-AWD (one early drying period), Two-AWD (two early drying periods), Full-AWD (wetting and drying cycles throughout the rice season), and CF (continuous flooding). Different rice varieties were also tested in the experiment. In this study, we emphasized one factor (irrigation effect) that affects the dependent variable. The results show that early AWD treatments reduced methane (CH 4 ) emissions by 35.7 to 51.5% in dry season and 18.5 to 20.1% in wet season, while full-AWD practice reduced CH 4 emissions by 52.8 to 61.4% compared with CF. Full-AWD in dry season not only significantly reduced CH 4 emission during that season, it also resulted in the decline of the early season emission in the succeeding wet season. Global warming potential (GWP) and yield-scaled GWP were reduced by early or full season AWD in both rice seasons. The GWP value from nitrous oxide (N 2 O) was relatively low compared to that from CH 4 in both rice seasons. Rice yield was not affected by irrigation treatments although varietal differences in grain and straw yields were observed in both rice seasons. This study demonstrated that early season water managements are also effective in reducing CH 4 and total GHG emissions without affecting rice yield.

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“…The use of nitrification inhibitor under wet irrigation reduced N 2 O emission [17]. Subsequent delayed flooding or intermittent irrigation can contribute to significantly reduce the global warming potential of rice cropping systems concerning continuous flooding [18], [19].…”

Section: B Seasonal Pattern Of Nitrous Oxide Emissionsmentioning

confidence: 99%

Mitigation Potential of Nitrous Oxide Emissions from Irrigated Rice Fields by the DNDC-Rice Model

Smakgahn¹

2020

IJESD

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The DNDC-Rice model was used to obtain mitigation potential of N 2 O emission from flooded rice fields under various water management regimes in central Thailand. The alternative water management (midseason drainage, multiple drainage, and local method) emitted approximately 61% of N 2 O emissions higher than conventional water management (continuously flooded). The short drainage period (local method) emitted the lowest emission compared to other treatments. There was no difference in crop carbon, harvest part, shoot and root portion among 4 treatments. Also, the efficiency of nitrogen uptake by the crop of all treatments was not different. The continuously flooded and short drainage period is an interesting candidate for mitigating N 2 O emissions from irrigated rice cultivation. However, multiple drainages are a remarkable effective practice to reduce greenhouse gases (CH 4 and N 2 O) emissions from the rice field.

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Greenhouse gas emissions as affected by different water management practices in temperate rice paddies

Cited by 88 publications

References 35 publications

Early season N<sub>2</sub>O emissions under variable water management in rice systems: source-partitioning emissions using isotope ratios along a depth profile

Early season N<sub>2</sub>O emissions under variable water management in rice systems: source-partitioning emissions using isotope ratios along a depth profile

Mitigation Potential and Yield-Scaled Global Warming Potential of Early-Season Drainage from a Rice Paddy in Tamil Nadu, India

Mitigation Potential of Nitrous Oxide Emissions from Irrigated Rice Fields by the DNDC-Rice Model

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Greenhouse gas emissions as affected by different water management practices in temperate rice paddies

Cited by 88 publications

References 35 publications

Early season N&lt;sub&gt;2&lt;/sub&gt;O emissions under variable water management in rice systems: source-partitioning emissions using isotope ratios along a depth profile

Early season N&lt;sub&gt;2&lt;/sub&gt;O emissions under variable water management in rice systems: source-partitioning emissions using isotope ratios along a depth profile

Mitigation Potential and Yield-Scaled Global Warming Potential of Early-Season Drainage from a Rice Paddy in Tamil Nadu, India

Mitigation Potential of Nitrous Oxide Emissions from Irrigated Rice Fields by the DNDC-Rice Model

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Early season N<sub>2</sub>O emissions under variable water management in rice systems: source-partitioning emissions using isotope ratios along a depth profile

Early season N<sub>2</sub>O emissions under variable water management in rice systems: source-partitioning emissions using isotope ratios along a depth profile