Abstract: Experiments were conducted during April-Oct. 1994 in Beijing rice field. Largecultivar differences in methane emission flax have been found. Variety 93812 emitted about fivefold more CH₄ per meter square per hour than did the variety Qiuguang. Organic amendment plus (NH₄)₂SO₄ as the mixed base fertilizer and (NH₄)₂SO₄ as the topdressing applied in different amounts and stages compared with the mixed base fertilizer only could reduce methane emission about 58% and increase rice yield about 31.7%. Emission Peaks of CH₄ in the tillering stage and reproductive stage could be obviously suppressed.

Key words: Methane emission flux, rice cultivars, intracellular air spaces (aerenchyma), tillering fertilizer

摘要： 1994年4月至10月，在北京稻田试验田研究了不同水稻品种对甲烷排放的影响以及施肥措施对降低甲烷排放和提高水稻产量的匹配关系。实验表明稻田甲烷排放在品种之间存在着明显差异，实验中品种间甲烷排放通量最大差异可达到五倍。以有机肥混合硫酸铵作底肥并配合不同时间和不同用量的硫酸铵作追肥与仅施混合底肥不施硫酸铵作追肥的相比较可减少甲烷排放约58%，水稻产量提高31.7%。可明显地抑制水稻生长期的甲烷排放高峰期。

关键词: 甲烷排放通量, 水稻品种, 细胞间空隙, 分蘖肥, 穗肥