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

Ye Pei; Song Chunyan; Liu Kaiwen; Liu Zhixiong; Xie Qingyun; Hu Yanyan; Zhu Bo; Wang Bin

doi:10.11898/1001-7313.20220609

Vol.33, NO.6, 2022

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Article Navigation > Journal of Applied Meteorological Science > 2022 > 33(6): 748-758

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.

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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.

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

DOI: 10.11898/1001-7313.20220609

1.
Jingzhou Agro-meteorology Experimental Station, Jingzhou 434000
2.
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081
3.
Wuhan Regional Climate Center, Wuhan 430074
4.
College of Agriculture, Yangtze University, Jingzhou 434025

Received Date: 2022-06-02
Rev Recd Date: 2022-09-09

Available Online: 2022-11-21

Publish Date: 2022-11-17

Abstract

Abstract

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.
- Jianghan Plain;
- different rice cropping patterns;
- global warming potential;
- greenhouse gas emission intensity

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References(40)

Figures and Tables

Fig. 1 Variation of daily precipitation and temperature at experimental sites during rice growth period in 2021

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图 2 2021年不同稻作模式下CH₄排放通量动态变化

(虚线箭头表示施肥，下同)

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

(dotted arrow denotes fertilization, the same hereinafter)

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

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图 4 不同稻作模式CH₄和N₂O累积排放量

(不同小写字母表示差异显著(P<0.05))

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

(different lowercase letters denote significant difference at 0.05 level)

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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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