Ye Pei, Song Chunyan, Liu Kaiwen, et al. Greenhouse gas emission characteristics of different rice cropping patterns in Jianghan Plain. J Appl Meteor Sci, 2022, 33(6): 748-758. DOI:  10.11898/1001-7313.20220609.
Citation: Ye Pei, Song Chunyan, Liu Kaiwen, et al. Greenhouse gas emission characteristics of different rice cropping patterns in Jianghan Plain. J Appl Meteor Sci, 2022, 33(6): 748-758. DOI:  10.11898/1001-7313.20220609.

Greenhouse Gas Emission Characteristics of Different Rice Cropping Patterns in Jianghan Plain

DOI: 10.11898/1001-7313.20220609
  • Received Date: 2022-06-02
  • Rev Recd Date: 2022-09-09
  • Available Online: 2022-11-21
  • Publish Date: 2022-11-17
  • A field experiment is conducted in Jianghan Plain using static chamber-gas chromatography method to monitor greenhouse gas emissions from 5 different rice cropping systems:Early rice, late rice, middle rice, rice-crayfish coculture and ratooning rice systems. The emission characteristics of methane and nitrous oxide fluxes, global warming potential and greenhouse gas emission intensity in different rice patterns are analyzed, aiming to provide scientific references for accurate estimates of greenhouse gas emissions from rice paddy. The results show that methane emissions are concentrated in the early flooding stage of rice paddy, with a flux peak of (85.7 mg·m-2·h-1) for rice-crayfish system, which is higher than those of other patterns by 71.7%-191.5%. Nitrous oxide emissions are mainly observed during mid-season drainage or after nitrogen fertilization, and the highest flux peak is found for ratooning rice (1100.7 μg·m-2·h-1), which is 16.8%-654.9% higher than other patterns. The sequence of accumulated methane emission from largest to smallest is rice-crayfish (541.1 kg·hm-2), ratooning rice (293.7 kg·hm-2), early rice (177.2 kg·hm-2), late rice (133.7 kg·hm-2), and middle rice (115.3 kg·hm-2). For nitrous oxide emission, the sequence is ratooning rice (5.1 kg·hm-2), early rice (2.1 kg·hm-2), late rice (1.0 kg·hm-2), middle rice (0.6 kg·hm-2), and rice-crayfish (0.4 kg·hm-2). As for total emission calculated by global warming potential, the value of rice-crayfish is 13657.7 kg·hm-2, followed by ratooning rice (8857.0 kg·hm-2), early rice (5067.3 kg·hm-2), late rice (3647.0 kg·hm-2), and middle rice (3053.8 kg·hm-2). Rice-crayfish is also accompanied by high greenhouse gas emission intensity reaching up to 1.4 kg·kg-1, followed by early rice (0.79 kg·kg-1), ratooning rice (0.57 kg·kg-1), late rice (0.53 kg·kg-1), and middle rice (0.34 kg·kg-1). The total emission and intensity of middle rice is significantly smaller than those of rice-crayfish system by 77.6% and 75.7%. It is notable that methane emission accounts for 82.9%-99.0% of total emission among different rice cropping patterns, indicating that controlling methane is key for low-carbon production. Due to water flooding in rice paddy, nitrous oxide emission is small. The high emissions from rice-crayfish paddy are mainly attributed to the long duration of flooding, straw returning and large amount of fodder input, which has led to a long period of soil anaerobic condition, and plenty of carbon substrate for methane production. Thus, it is important to explore methane reduction practices and strategies in rice-crayfish paddy. The emission intensity of middle rice is the lowest due to paddy-upland rotation and can be considered as a low-carbon rice cultivation pattern.
  • Fig. 1  Variation of daily precipitation and temperature at experimental sites during rice growth period in 2021

    Fig. 2  Dynamic variations of methane fluxes under different rice cropping patterns in 2021

    (dotted arrow denotes fertilization, the same hereinafter)

    Fig. 3  Dynamic variations of nitrous oxide fluxes under different rice cropping patterns in 2021

    Fig. 4  Cumulative methane and nitrous oxide emissions under different rice cropping patterns

    (different lowercase letters denote significant difference at 0.05 level)

    Table  1  Date of rice transplanting, mid-season drainage and harvesting under different rice cropping patterns in 2021

    模式 品种 移栽 晒田 收获
    早稻 两优152 05-02 05-30—06-06 07-21
    晚稻 隆优4945 07-26 08-25—31 10-17
    中稻 黄华占 06-10 07-27—08-01 10-05
    虾稻 黄华占 06-14 10-08
    再生稻 天两优616 04-23 05-30—06-08 头季08-17,再生季10-25
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    Table  2  Global warming potential and greenhouse gas emission intensity under different rice cropping patterns

    稻作类型 CH4排放占比/% N2O排放占比/% 增温潜势/(kg·hm-2) 水稻产量/(kg·hm-2) 温室气体排放强度/(kg·kg-1)
    早稻 87.4 12.6 5067.3 6441.4 0.79
    晚稻 91.9 8.1 3647.0 6925.3 0.53
    中稻 94.2 5.8 3053.8 9052.7 0.34
    虾稻 99.0 1.0 13657.7 9745.1 1.40
    再生稻 82.9 17.1 8857.0 15609.2 0.57
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    • Received : 2022-06-02
    • Accepted : 2022-09-09
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    • 网络出版日期:  2022-11-21
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    • Published : 2022-11-17

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