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| N2O emissions from ratoon paddy fields covered with plastic film mulching in the hilly area of central Sichuan, China |
| Received:November 01, 2018 |
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| KeyWord:ratoon rice;N2O emissions;plastic film mulching cultivation;paddy field;grain yield |
| Author Name | Affiliation | E-mail | | SONG Kai-fu | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | YU Hai-yang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHANG Guang-bin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | XU Hua | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LÜ Shi-hua | Key Laboratory of Agricultural Environment in Southwest Mountain Areas, Ministry of Agriculture, Institute of Soil Fertilizer, Sichuan Agriculture Sciences Academy, Chengdu 610066, China | | | MA Jing | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | jma@issas.ac.cn |
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| Abstract: |
| To determine N2O emissions patterns of plastic film mulching (PM) in ratoon paddy fields, this study used static chamber-gas chromatography to observe ratoon paddy fields in the hilly area of central Sichuan. The experiment was conducted with two treatments including film mulching of single rice (SR) and film mulching of single-ratoon rice (SR-RR). The results showed that there were two distinct N2O emissions peaks in the SR-RR treatment in the main crop season, and the first appeared 13 days earlier than SR treatment, while the highest peak appeared in the ratoon season with a value of 1 630.7 μgN·m-2·h-1. The N2O emissions from the SR-RR treatment was 5.63 kgN·hm-2 during the full observation period, and the N2O emissions during the ratoon season was 2.35 kgN·hm-2, which accounted for approximately 42% of the total emissions in the two seasons. The total amount of N2O emitted from the SR-RR treatment in the two seasons was 246% higher than that of the SR treatment (P<0.05). The total rice yield of SR-RR in the two seasons was 10.4 t·hm-2, and the yield of the ratoon season was 1.89 t·hm-2, which accounted for 18% of the total rice yield in the two seasons. The grain yields in the two seasons were 22% (P<0.05) higher than that of the SR treatment. The N2O emissions per unit of yield from the SR-RR treatment was 0.54 kgN·t-1 grain, which was 184% higher than that of the SR treatment (P<0.05). These results provide supporting date and a scientific basis for further analysis on the N2O emissions rules of ratoon paddy fields covered with PM, as well as the search for effective emissions reduction measures. |
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