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以福州平原稻田为研究对象,对对照与硫酸盐添加处理稻田甲烷与氧化亚氮排放通量进行了测定与分析.研究结果表明:对照与硫酸盐添加处理稻田甲烷排放通量分别为0.09~16.90和0.02~9.60mg·m-2·h-1,平均值分别为3.66和2.81 mg·m-2·h-1;氧化亚氮排放通量分别为-55.67~63.73和-25.25~51.88μg·m-2·h-1,平均值分别为7.71和9.48μg·m-2·h-1;温室气体综合增温效应分别为2 264.5和1 728.47 kg·hm-2(CO2).硫酸盐的添加降低了稻田甲烷排放通量,增加了氧化亚氮排放通量,但稻田温室气体综合增温效应降低了24%.从水稻产量特征来看,硫酸盐添加处理水稻产量有所增加.因此,硫酸盐添加可作为亚热带稻田温室气体减排的有效方法.
Taking the Fuzhou plain paddy field as the research object, the methane and nitrous oxide emission flux of the control and sulfate addition paddy fields were measured and analyzed.The results showed that the methane emission flux of the paddy field of the control and sulfate addition treatment was 0.09 ~ 16.90 And 0.02 ~ 9.60mg · m-2 · h-1, respectively, with the average values of 3.66 and 2.81 mg · m-2 · h-1, respectively. The N2O fluxes were -55.67 ~ 63.73 and -25.25 ~ 51.88μg · m-2 · h-1, with the average values of 7.71 and 9.48 μg · m-2 · h-1, respectively.The comprehensive warming effects of greenhouse gases were 2 264.5 and 1 728.47 kg · hm-2 (CO2) Addition of methane reduced the flux of methane in paddy field and increased the flux of nitrous oxide, but the comprehensive warming effect of paddy field decreased by 24% .From the characteristics of rice yield, the yield of paddy increased with sulfate addition.Therefore, Sulfate addition can be an effective method to reduce greenhouse gas emissions in subtropical paddy fields.