Effects of Irrigation Regime and Nitrogen Fertilizer Management on CH 4, N 2 O and CO 2 Emissions from Saline–Alkaline Paddy Fields in Northeast China

Jie Tang, Jingjing Wang, Zhaoyang Li, Sining Wang and Yunke Qu
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Jie Tang: Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130012, China
Jingjing Wang: Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130012, China
Zhaoyang Li: College of Environment and Resources, Jilin University, Changchun 130012, China
Sining Wang: College of Environment and Resources, Jilin University, Changchun 130012, China
Yunke Qu: College of Environment and Resources, Jilin University, Changchun 130012, China

Sustainability, 2018, vol. 10, issue 2, 1-15

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 CH 4 flux (by 22.81% and 23.62%), but higher CO 2 flux (by 24.84% and 32.39%) was observed from intermittent irrigation fields. No significant differences of N 2 O 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, CH 4 + N 2 O + CO 2 ) of the 57-year-old field under the N250 treatment was up to 4549 ± 296 g CO 2 -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 CH 4 and N 2 O, but N fertilizer contributed positively to the GWP.

Keywords: methane; nitrous oxide; carbon dioxide; irrigation regime; N fertilizer; rice paddy; saline–alkali soil (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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