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以不同水稻品种为材料 ,通过测定孕穗至齐穗期稻田甲烷排放量 ,研究不同品种、不同栽培密度和不同施氮水平对稻田甲烷排放的影响。结果表明 :1在品种演进过程中 ,产量水平不断提高 ,稻田甲烷排放通量呈逐渐减小 (南京 1号最大除外 )的趋势 ,即南京 1号 >冒子头 >珍珠矮 >扬稻 4号 ,且孕穗期与齐穗期趋势一致。 2施氮量、栽植密度对稻田甲烷排放均有影响 ,稻田甲烷排放通量以高氮处理最高 ,中氮处理次之 ,低氮处理最小 ;每穴栽插 4苗处理最高 ,3苗次之 ,2苗最小。
Using different rice varieties as materials, the methane emissions from paddy field at booting to heading stage were measured to study the effects of different varieties, planting densities and N rates on methane emission from paddy fields. The results showed as follows: 1 During the evolution of cultivars, the output level increased continuously and the flux of methane emission in the paddy field tended to decrease (except Nanjing No.1), namely Nanjing No.1> Head> Pearl short> Yangdao 4 , And the same trend of booting stage and heading stage. Nitrogen and transplanting density had an impact on methane emission in paddy field. Methane emission flux in paddy field was the highest with high nitrogen, followed by middle nitrogen and lowest nitrogen; , 2 seedlings the smallest.