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１９９４年利用密闭箱法观测了广州地区早稻和晚稻ＣＨ４的排放，结果ＣＨ４平均排放通量早稻为０．２２～３．８１ｍｇ／ｍ２·ｈ，晚稻为０．３６～１７．６３ｍｇ／ｍ２·ｈ。其中淹水稻田为３．８１～１７．６３ｍｇ／ｍ２·ｈ，常规灌溉为０．２２～２．８４ｍｇ／ｍ２·ｈ。表明淹水稻田ＣＨ４排放显著高于常规灌溉，晚稻高于早稻，水旱轮作能显著减少稻田ＣＨ４排放。常规灌溉ＣＨ４排放明显低于国内其他稻区，对其原因进行了初步分析。
In 1994, the closed-cell method was used to observe the emission of early and late rice CH4 in Guangzhou area. The average emission of CH4 was 0.22 ~ 3.81mg / m2 · h for early rice and 0.36 ~ 17.63mg / m2 · h for late rice . Among them, flooding paddy fields were 3.81 ~ 17.63mg / m2 · h, conventional irrigation was 0.22 ~ 2.84mg / m2 · h. The results showed that CH4 emissions in flooded rice fields were significantly higher than conventional irrigation, late rice was higher than that in early rice, and the rotation and drainage of rice could significantly reduce CH4 emissions in paddy fields. Conventional irrigation CH4 emissions were significantly lower than other domestic rice areas, the reasons for a preliminary analysis.