N_2O and CH_4 fluxes from a volcanic grassland soil in Nasu, Japan : Comparison between manure plus fertilizer plot and fertilizer-only plot(Environment)

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We examined the effects of manure + fertilizer application and fertilizer-only application on nitrous oxide (N_2O) and methane (CH_4) fluxes from a volcanic grassland soil in Nasu, Japan. In the manure + fertilizer applied plot (manure plot), the sum of N mineralized from the manure and N applied as ammonium sulfate was adjusted to 210kgNha^<-1> year^<-1>. In the fertilizer-only applied plot (fertilizer plot), 210kgNha^<-1> year^<-1> was applied as ammonium sulfate. The manure was applied to the manure plot in November and the fertilizer was applied to both plots in March, May, July and September. From November 2004 to November 2006, we regularly measured N_2O and CH_4 fluxes using closed chambers. Annual N_2O emissions from the manure and fertilizer plots ranged from 7.0 to 11.0 and from 4.7 to 9.1kgNha^<-1>, respectively. Annual N_2O emissions were greater from the manure plot than from the fertilizer plot (P<0.05). This difference could be attributed to N_2O emissions following manure application. N_2O fluxes were correlated with soil temperature (R=0.70, P<0.001), NH^+_4 concentration in the soil (R=0.67, P<0.001), soil pH (R=-0.46, P<0.001) and NO^-_3 concentration in the soil (R=0.40, P<0.001). When included in the multiple regression model (R=0.72, P<0.001), however, the following variables were significant: NH^+_4 concentration in the soil (β=0.52, P<0.001), soil temperature (β=0.36, P<0.001) and soil moisture content (β=0.26, P<0.001). Annual CH_4 emissions from the manure and fertilizer plots ranged from -0.74 to -0.16 and from -0.84 to -0.52kgCha^<-1>, respectively. No significant difference was observed in annual CH_4 emissions between the plots. During the third grass-growing period from July to September, however, cumulative CH_4 emissions were greater from the manure plot than from the fertilizer plot (P<0.05). CH_4 fluxes were correlated with NH^+_4 concentration in the soil (R=0.21, P<0.05) and soil moisture content (R=0.20, P<0.05). When included in the multiple regression model (R=0.29, P<0.05), both NH^+_4 concentration in the soil (β=0.20, P<0.05) and soil moisture content (β=0.20, P<0.05) were significant.
社団法人日本土壌肥料学会の論文

N_2O and CH_4 fluxes from a volcanic grassland soil in Nasu, Japan : Comparison between manure plus fertilizer plot and fertilizer-only plot(Environment)

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