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用封闭箱法对广东省赤红壤早稻田CH4排放通量进行了观测。结果表明,CH4排放有明显的季节变化规律,3个排放高峰分别出现在水稻分蘖末期、孕穗抽穗期和乳熟期,平均通量为5.7mg.m-2.h-1。在测定期内,CH4排放与5和10cm土壤温度呈显著正相关,与土壤Eh呈显著负相关,与土壤pH值、水层深浅相关不明显。
The closed-cell method was used to measure the CH4 fluxes in the latosolic red rice paddy fields in Guangdong Province. The results showed that there was a clear seasonal variation of CH4 emission. The three emission peaks appeared at the end of tillering, booting and milking, respectively, and the average flux was 5.7mg.m-2.h-1. There was a significant positive correlation between CH4 emission and soil temperature at 5 and 10 cm, negative correlation with soil Eh and no significant correlation with soil pH and water depth during the measurement period.