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在大田条件下,应用甲烷自动测试系统在水稻生育期内持续测定3个水稻品种的甲烷排放通量。试验结果表明:水稻品种对稻田甲烷排放通量有明显的影响,品种间差异高达2.26倍;根量大的水稻品种,甲烷排放通量高,稻田气泡排放甲烷强度大,土壤水溶液中水溶甲烷浓度也高。试验证明,水稻根系的大小是导致水稻品种间甲烷排放通量差异的主要原因。
Under field conditions, methane emission was continuously measured in three rice cultivars during the growth period of rice using methane automatic test system. The results showed that rice varieties had a significant effect on the methane emission fluxes from paddy fields, and the differences among varieties were as high as 2.26 times. The rice varieties with large root amounts had high methane emission fluxes, methane emission from bubble in paddy fields, water-soluble methane concentration in soil water Also high. Experiments show that the size of rice root is the main reason for the difference in methane emission fluxes among rice varieties.