【摘要】 采用盆栽试验研究了长江三角洲14个主要超级稻品种(6个粳型超级稻和8个籼型杂交超级稻)CH4排放特征及其与植株生长特性之间的关系.结果表明:粳型和籼型超级稻全生育期CH4排放均呈双峰模式,排放峰值分别出现在分蘖盛期和孕穗期.粳型超级稻的平均CH4排放总量比籼型超级稻高37.6%(P<0.01),品种间排放差异主要出现在生长后期.虽然两种类型超级稻的CH4排放总量均与最大叶面积呈显著正相关,但CH4排放与其他生长特性的关系因品种类型而异.在株高上,粳型超级稻CH4排放总量与株高呈显著正相关,而籼型超级稻的相关不显著.在生产力上,籼型超级稻CH4排放总量与其总生物量、籽粒产量和收获指数呈显著负相关,而粳型超级稻的相关不显著.籼型超级稻CH4排放量低主要是由于其根系生物量显著高于粳型超级稻.更多还原

【Abstract】 A pot experiment was conducted to study the CH4emission features of fourteen leading super-rice varieties( six Japonica rice varieties and eight Indica hybrid rice varieties) and their relationships with the varieties growth characteristics in Yangtze Delta. Two distinct peaks of CH4emission were detected during the entire growth period of the varieties,one peak occurred at fulltillering stage,and the other appeared at booting stage. The average total CH4emission of Japonica rice varieties was 37. 6% higher than that of the Indica hybrid rice varieties( P<0. 01),and the differences in the CH4emission between rice types occurred at the post-anthesis phase. For all the varieties,there was a significant positive correlation between the total CH4emission and the maximum leaf area,but the correlations between the CH4emission and the other growth characteristics varied with variety type. The total CH4emission of Japonica rice varieties had a significant positive correlation with plant height,while the correlations between the total CH4emission of Indica hybrid rice varieties and their plant height were not significant. The total CH4emission of Indica hybrid rice varieties had significant negative correlations with the total aboveground biomass,grain yield,and harvest index,but the correlations were not significant for Japonica rice varieties. The lower CH4emission of Indica hybrid rice varieties was likely due to their significantly higher root biomass,as compared with Japonica rice varieties.更多还原