Soil NO_3-N Production and Immobilization Affected by NH_4-N, Glycine, and NO_3-N Addition in Different Forest Types in Shikoku, Southern Japan

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The characteristics of production and immobilization of NO_3-N were evaluated for soils from four forest types in Kochi Prefecture, southern Japan. Net NO_3-N production during the laboratory incubation differed among the soils from the four forest types, being high under Japanese cedar (Cryptomeria japonica D. Don) and deciduous hardwood, and negligible under Japanese red pine (Pinus densiflora Sieb. et Zucc.) and hinoki cypress (Chamaecyparis obtusa Endlicher). Nitrification under Japanese cedar and hardwood was mainly autotrophic based on the fact that nitrification was inhibited by acetylene or nitrapyrin, and was not affected by cycloheximide. Net NO_3-N production in these soils increased by glycine addition, but did not increase appreciably by NH_4Cl addition. However, net NO_3-N production increased after the addition of CaCO_3 with NH_4Cl. These results indicate that the substrate of nitrification is NH_3 rather than NH_4^+ and that the added NH_4^+ is not utilized by nitrifiers at low pH values. With NO_3-N addition to soils under red pine and hinoki cypress, immobilization of NO_3-N was observed followed by rapid production of NH_4^-N. These findings suggested that mobile NO_3-N can be converted to less mobile NH_4-N by the activities of soil microorganisms. This microbial process may play an important role in retaining nitrogen within forest ecosystems where the potential of N loss is high due to the high precipitation in the area.
社団法人日本土壌肥料学会の論文

Soil NO_3-N Production and Immobilization Affected by NH_4-N, Glycine, and NO_3-N Addition in Different Forest Types in Shikoku, Southern Japan

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