Abstract: Pot experiment with a paddy soil was conducted to study the effect of several combined applications of organic and inorganic fertilizers on CH₄ emission.The results indicate that the CH₄ emission showed a pronounced diurnal variation,and the peaks occured at late tillering and early heading stages.Different combined applications of organic and inorganic fertilizers showed an obvious effect on CH₄ emission,and the highest and lowest emissions were 8.12 and 5.72 g·m^-2 respectively,with a 42% difference.Granulated organic inorganic fertilizer induced a high CH₄ emission,but the rice yield was also high.Instead,the CH₄ emission of per unit rice yield was lower.

Key words: CH₄ emission, Organic inorganic fertilizer, Paddy soil, niche breadth, generalized additive model, forest community, dominant species, niche overlap