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| Effects of ecological planting symbiosis on CH4 and N2O emissions from rice fields under wide ridge cultivation with no-tillage |
| Received:January 06, 2021 |
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| KeyWord:rice-duck farming;rice-fish farming;wide-ridge cultivation with no-tillage;methane;nitrous oxide |
| Author Name | Affiliation | E-mail | | CHEN Lu | College of Agronomy, Hunan Agricultural University, Changsha 410128, China | | | CHEN Can | College of Agronomy, Hunan Agricultural University, Changsha 410128, China
Hunan Province Rice Field Ecological Planting Engineering Technology Research Center, Changsha 410128, China | CC973@126.com | | HUANG Huang | College of Agronomy, Hunan Agricultural University, Changsha 410128, China
Hunan Province Rice Field Ecological Planting Engineering Technology Research Center, Changsha 410128, China | hh863@126.com | | REN Bo | College of Resources & Environment, Hunan Agricultural University, Changsha 410128, China | | | WANG Ren | College of Agronomy, Hunan Agricultural University, Changsha 410128, China | | | LIANG Yu-gang | Rice Research Institute of Hunan Academy of Agricultural Sciences, Changsha 410125, China | | | ZHOU Jing | College of Agronomy, Hunan Agricultural University, Changsha 410128, China | |
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| Abstract: |
| To clarify the impact of no-tillage rice integrated farming modes on methane（CH4）and nitrous oxide（N2O）emissions, as well as the global warming potential（GWP）and greenhouse gas intensity（GHGI）, different farming modes were applied in this study, including two rice-animal coupling modes and two tillage methods, to provide a theoretical reference for greenhouse gas emissions from farming under no-tillage in paddy fields. Six treatments were used, including wide-ridge cultivation with no-tillage rice-duck farming, wide-ridge cultivation with no-tillage rice-fish farming（W-RF）, wide-ridge cultivation with no-tillage control check（W-CK）, flattened plowing planting rice-duck farming（F-RD）, flattened plowing planting rice-fish farming（F-RF）, and flattened plowing planting control check（FCK）. CH4 and N2O emissions were collected by the closed static box method, and the cumulative emissions, GWP, and GHGI of doublecropping early rice and late rice fields were analyzed. Results showed that the CH4 cumulative emissions of early rice were the highest in the late tillering stage to the booting stage, the cumulative CH4 emissions of late rice were mainly concentrated in the re-greening stage to late tillering stage, and the CH4 emissions of early rice accounted for 61.60% to 77.00% of the annual emissions. The N2O cumulative emissions of early rice and late rice were the highest at the late tillering stage to the booting stage, the highest annual N 2O cumulative WCK emissions were 7.85 kg·hm-2, and the lowest of F-RF were 2.64 kg·hm-2, with a remarkable difference. The annual N2O emission equivalent CO2 quality of wide ridge cultivation was significantly higher than that of the flatten plowing planting; both were significantly lower than the CK treatment. According to the GWP analysis, F-CK showed the highest total GWP and total GHGI of double-cropping rice, with a total GWP of 25 258.08 kg·hm-2 and a total GHGI of 4 501.41 kg CO2-eq·kg-1. W-RF was the lowest with a total GWP of 14 819.94 kg·hm-2, and the total GHGI was 2 232.83 kg CO2-eq·kg-1. The total GWP and GHGI of W-RF were lower than those of F-CK by 41.33% and 48.40%, respectively, with significant differences. The W-RF and F-RF modes in the total annual rice yield were significantly higher than others, at 13.36 t·hm-2 and 13.20 t·hm-2, respectively. In summary, W-RF ensures high yields and reduces the GWP and GHGI of rice fields. |
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