摘要
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。
With different rice varieties as materials, methane transmission velocity of the plant growing in water nutrient solution cultivation was measured by laboratory technique. Variations of methane emission flux caused by different rice varieties, plant density and nitrogen fertilizer in the field were analyzed. The main results were as follows: ① With the evolution of Indicia rice varieties, the grain yield increased lineally. Methane transmission velocity of plant increased, but methane emission flux decreased from the field. The trend of methane emission flux at the booting state was the same as that at the heading. ② Nitrogen fertilizer and plant density had significant effects on methane emission flux. High fertilizer treatment had highest emission rate, followed by the mid fertilizer one, and low fertility one had lowest emission rate. Four seedlings per hill resulted in highest emission rate, three seedlings per hill in lower emission rate, and two seedlings per hill in lowest emission rate.
基金
江苏省农业技术更新工程资助项目
