外部NH_4^+が各種森林土壌A層の硝酸化成に及ぼす影響

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To evaluate the difference of the H^+ via nitrification among soil types or vegetation types when external NH_4^+ was added to forest soils and to investigate the soil factors that control nitrification, we conducted leaching incubation experiments adding 3 concentrations of NH_4^+ nutrient solutions (0, 5.3, 15.9 mg N L^<-1>) weekly for 6 weeks. Fourteen A horizon samples differed in parent materials and vegetation (deciduous or coniferous). The results btaine are as follows. 1) Nitrification was restrained without NH_4^+ addition, whereas it was promoted with NH_4^+ addition after 6 weeks of incubation. The nitrate product with high-NH_4^+ addition was one to two times higher than that with low-NH_4^+ addition. 2) In four samples (coniferous 3, deciduous 1) with less than 10% Ca saturations, nitrification did not occur even with NH_4^+ addition. 3) Nitrate products were generally higher in the samples from the deciduous forests than the coniferous forests. Samples with shale and serpentinite parent materials had lower nitrification potentials. 4) Judging the properties of nitrification potential from the release of H^+, we identified two pathways of nitrification; one had NH_4^+ as the substrate and the other had organic nitrogen as the substrate. The lower nitrification potential soils leaned on nitrification via organic nitrogen. 5) Results of multiple regression analyse ssuggested that pH_<kcl> and exchangeable Ca^<2+> were contributive to nitrification and the release of H^+ via nitrification.
社団法人日本土壌肥料学会の論文
2000-02-05

外部NH_4^+が各種森林土壌A層の硝酸化成に及ぼす影響

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