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Sustainability 2018, 10(2), 475; https://doi.org/10.3390/su10020475

Effects of Irrigation Regime and Nitrogen Fertilizer Management on CH4, N2O and CO2 Emissions from Saline–Alkaline Paddy Fields in Northeast China

1
Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130012, China
2
College of Environment and Resources, Jilin University, Changchun 130012, China
*
Author to whom correspondence should be addressed.
Received: 30 November 2017 / Revised: 26 January 2018 / Accepted: 6 February 2018 / Published: 11 February 2018
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Abstract

Irrigation regime and fertilizer nitrogen (N) are considered as the most effective agricultural management systems to mitigate greenhouse gas (GHG) emissions from crop fields, but few studies have involved saline–alkaline paddy soil. Gas emitted from saline–alkaline paddy fields (1-year-old and 57-year-old) was collected during rice growing seasons by the closed chamber method. Compared to continuous flooding irrigation, lower average CH4 flux (by 22.81% and 23.62%), but higher CO2 flux (by 24.84% and 32.39%) was observed from intermittent irrigation fields. No significant differences of N2O flux were detected. Application rates of N fertilizer were as follows: (1) No N (N0); (2) 60 kg ha−1 (N60); (3) 150 kg ha−1 (N150); and (4) 250 kg ha−1 (N250). The cumulative emissions of GHG and N fertilizer additions have positive correlation, and the largest emission was detected at the rate of 250 kg N ha−1 (N250). Global warming potential (GWP, CH4 + N2O + CO2) of the 57-year-old field under the N250 treatment was up to 4549 ± 296 g CO2-eq m−2, approximately 1.5-fold that of N0 (no N application). In summary, the results suggest that intermittent irrigation would be a better regime to weaken the combined GWP of CH4 and N2O, but N fertilizer contributed positively to the GWP. View Full-Text
Keywords: methane; nitrous oxide; carbon dioxide; irrigation regime; N fertilizer; rice paddy; saline–alkali soil methane; nitrous oxide; carbon dioxide; irrigation regime; N fertilizer; rice paddy; saline–alkali soil
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Tang, J.; Wang, J.; Li, Z.; Wang, S.; Qu, Y. Effects of Irrigation Regime and Nitrogen Fertilizer Management on CH4, N2O and CO2 Emissions from Saline–Alkaline Paddy Fields in Northeast China. Sustainability 2018, 10, 475.

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