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对整个水稻生长期稻田CH_4排放率进行了4年连续观测,结果表明,稻田CH_4排放呈很强的日变化规律和季节变化规律:早上6时左右排放率最低,下午4时左右最高;早稻在5月20日至6月20日排放率最高,在收割前又有回升趋势;晚稻在栽插后几天至8月中旬排放率最高,随后逐渐降低。稻田CH_4排放率的日变化和季节变化与空气温度的日变化和季节变化一致;稻田CH_4排放率的施肥效应有明显的规律性,从高至低依次为全有机肥,常规肥,全沼渣肥,全化肥;稻田CH_4排放还有明显的年际变化,其排放率与土壤有机酸含量呈显著正相关。
The results showed that the daily CH_4 emission of paddy field had a strong diurnal and seasonal variation pattern: the lowest was around 6:00 a.m. and the highest was around 4:00 p.m. From May 20 to June 20, the discharge rate was the highest, and there was a recovery trend before harvesting. The late rice rate was the highest from a few days after planting to the middle of August, and then gradually decreased. The diurnal and seasonal variations of CH_4 emission rate in rice fields are consistent with the diurnal and seasonal changes of air temperature. The fertilization effects of CH_4 emission rate in paddy fields have obvious regularity, from high to low, followed by organic manure, conventional fertilizer, Fertilizers and total fertilizers. There was also obvious interannual variation of CH_4 emission in paddy fields, and the emission rate was positively correlated with soil organic acid content.