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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.
The pot experiment was conducted to study the CH4 emission characteristics of 14 main super rice varieties (6 japonica super rice and 8 indica hybrid super rice) in the Yangtze River Delta and their relationship with plant growth characteristics. The results showed that both japonica rice and indica rice CH4 emission during the whole growth stage showed a bimodal pattern with peak emission at the tillering and booting stages respectively.The average total CH4 emission of japonica super rice was 37.6% higher than that of indica super rice (P <0.01) The difference of emission between cultivars mainly appeared in late growth stage.Although the total CH4 emissions of both types of super rice had a significant positive correlation with the maximum leaf area, the relationship between CH4 emission and other growth characteristics varied with the type of plant. , While the total amount of CH4 emission of japonica super rice was significantly and positively correlated with plant height, while the correlation was not significant between indica super rice.The productivity of CH4 and its total biomass, grain yield and harvest index But negatively correlated with japonica super rice.The low CH4 emission of indica super rice is mainly due to its root biomass is significantly higher than that of japonica super rice.