Research on the law of greenhouse gas emissions from rice fields under the rice-shrimp planting and breeding model

doi:10.14088/j.cnki.issn0439-8114.2023.10.007

Abstract

Abstract: A comparative monitoring experiment of CH₄ and N₂O emissions from paddy fields under rice-shrimp planting and breeding mode and middle rice monoculture was carried out in Jianghan Plain by the static chamber-gas chromatography method. The characteristics of greenhouse gas emission intensity in paddy fields under rice-shrimp planting and breeding mode and the effects of surface water depth and temperature on greenhouse gas emissions from rice-shrimp planting and breeding fields were mainly explored, which would provide a reference for the assessment of greenhouse gas emissions from rice fields and the formulation of emission reduction technologies in the Jianghan Plain. The results showed that compared with the conventional middle rice field, the cumulative CH₄ emission in rice-shrimp planting and breeding fields was significantly increased by 369.3%（P<0.05）, and the cumulative N₂O emission was significantly reduced by 33.3%（P<0.05）. There was a reciprocal relationship between N₂O and CH₄ emissions. The main contribution of warming potential was CH₄ emission, the greenhouse gas emission intensity of rice-shrimp planting and breeding fields was significantly increased by 1.06 kg CO₂-e/kg compared with that of the conventional middle rice field. There were significant positive correlation between CH₄ emission flux and surface water depth, and between CH₄ emission flux and surface water temperature in rice-shrimp planting and breeding fields （P<0.05）. There was a significant positive correlation between N₂O emission and temperature in the box in the conventional middle rice field during the non-flooding period （P<0.05）. The high emission of greenhouse gases in rice-shrimp planting and breeding fields was mainly caused by the continuous flooding and anaerobic state, and it was the most critical to explore the CH₄ emission reduction measures of this mode; the middle rice field had the low greenhouse gas emission due to the rotation of paddy-upland, and could be used as the main type of rice crop with low carbon emission reduction.

Key words: rice-shrimp planting and breeding model, warming potential, greenhouse gas intensity, Jianghan Plain

CLC Number:

LI Qing-hai, XIE Qing-yun, YE Pei. Research on the law of greenhouse gas emissions from rice fields under the rice-shrimp planting and breeding model[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(10): 30-36.

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