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稻田的温度系统涉及空气温度、灌溉水温度、土壤温度。晴天早晨气温回升后，从土壤（由深到浅）→灌溉水→空气，温度廊线很快呈递增趋势，并且斜率逐渐增加，到午后气温最高时，廊线斜串最大；傍晚，从土壤→灌溉水→空气，廊线转向，呈递减趋势，并且递减层由土壤浅部向深部发展。晴天气温的日变化符合正弦函数形式，水温、土壤温度的日变化同样符合正弦函数形式，并且两者都与空气温度有密切的关系，各温度的口变化可用口平均气温表示。阴雨天气温度日变化情况较复杂，并有个共同的特点，即土壤温度高于水温和气温。晚稻生长季口平均气温的季节变化符合γ函数形式，结合已取得的经验公式，本文能较好地估算晚稻生长季节稻田甲烷的排放量。
The temperature system in paddy fields involves air temperature, irrigation water temperature, soil temperature. In sunny morning, after warming up from the soil (from deep to shallow) → irrigation water → air, the temperature corridor quickly increased and the slope gradually increased. When the temperature reached the highest in the afternoon, the corridor inclined string was the largest. In the evening, from the soil → irrigation water → air, the corridor turns to a decreasing trend, and the descending layer develops from shallow depth to deep soil. The diurnal variation of sunny day temperature is in the form of a sine function. The diurnal variation of water temperature and soil temperature is also in the form of a sine function, and both are closely related to the air temperature. The diurnal variation of temperature in rainy and rainy days is more complicated and has the common feature that the soil temperature is higher than the water temperature and the temperature. The seasonal variation of average temperature in the late rice growing season coincides with the form of γ function. Combined with the empirical formula obtained, this paper can better estimate the methane emission from the paddy rice in the growing season.