A pot experiment was conducted with one superrice variety Ningjing 1 and a traditional japonica rice variety Zhendao 11 as material to study the differences in plant productivity and CH4 emission. Our results indicated that although there were no significant differences in geqhground biomass and the characteristics of CH4 fluxes between the two varieties, the total CH4 emission and average CH4 content of Ningjing 1 in soil solution were 35.22% (P < 005) and 41.31% (P < 0.01) lower in the field than those of Zhendao 11, respectively. The main differences in the amounts of CH4 emissions mainly occurred during the middle ricegrowing stage, while there were no significant differences in CH4 emission between the varieties during the early and late stages. After analyzing the differences in the growth characteristics such as plant productivity, plant height, leaf area and root growth between the varieties, it was found that the stronger root system was the main contributor to the lower CH4 emission of Ningjing 1 as comparison with Zhendao 11. Meanwhile, with a higher yield,Ningjing 1 also showed a lower CH4 emission at both biomass and yield scales, which were respectively 42.42% and 81.38% (P<0.05) lower compared to those of Zhendao 11. The above results indicated that enhancing rice productivity may not simultaneously promote CH4 emission, therefore, it is possible to get a rice variety with higher yield and lower CH4 emission through rice genetic improvement. The promotion of superrice variety application of Ningjing 1 may help to ensure food security and to reduce greenhouse gas emissions.
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