[Differences and Relationship Between Rhizosphere Characteristics and Methane Emissions of Double-cropping Rice...

Six field varieties of early rice and late rice were selected as test materials for field experiments to explore the difference in CH₄ emissions among different rice varieties, and Static Obscura-Gas Chromatography was used to determine the CH₄ gas. The results demonstrated a significant difference in the CH₄ emissions flux between early and late rice varieties. The average yield of total fertility CH₄ emissions was highest in Xiangzaoxian 24 and lowest in Zhuliangyou 819, with a difference of 34.6%. Of the late rice varieties, Tyou 15 was the highest and the Ziyou 299 was the lowest, with a difference of 33.9%. Differences in CH₄ emissions and the greenhouse effect of unit yields between different double cropping rice varieties differed significantly. The cumulative CH₄ emissions from early rice varieties ranged from 198.3-303.44 kg·hm^-2, and the lowest emissions were from Zhuliangyou 819. The greenhouse effect per yield ranged from 0.67 to 1.40 kg·kg^-1, and Luliangyou 996 had the lowest emission value. The late-season rice varieties exhibited significantly higher cumulative CH₄ emissions compared to early rice, ranging from 291.93 to 388.28 kg·hm^-2, and Ziyou 299 had the lowest emission value. The greenhouse effect of per yields rice varieties, while the late rice varieties were contrary to early rice. Reducing carbon and nitrogen concentrations in the rhizosphere and increasing Eh values could reduce CH₄ emissions.