Spatial variation of soil net nitrogen mineralization and nitrification in an old-growth beech-oak forest on Mt. Hakusan

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  • 大白川ブナ・ミズナラ成熟林（old-growth forest）における土壌窒素無機化速度の空間変動解析
  • タイハクガワ ブナ ・ ミズナラ セイジュクリン(old-growth forest)ニ オケル ドジョウ チッソ ムキカ ソクド ノ クウカン ヘンドウ カイセキ

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Abstract

<p>The objectives of the present study were to characterize the spatial patterns of net nitrogen mineralization and nitrification by focusing on the gap/canopy mosaic structure in an old-growth beech-oak forest on Mt. Hakusan, Japan. We observed high spatial variations in soil net nitrogen mineralization (2.7–94.7 kg-N ha−1 period−1) and nitrification rates (0.1–31.1 kg-N ha−1 period−1) with averages of 24.6 kg-N ha−1 period−1 and 4.9 kg-N ha−1 period−1, respectively during a field incubation period of 135 days. In addition, the nitrification ratio for nitrogen mineralization exhibited high spatial variation that ranged from 0.9％ to 91.5％ and averaged 24.3％. The net nitrogen mineralization, nitrification rates, and canopy openness parameters showed a significant positive correlation with inorganic nitrogen content (NO3-N and NH4-N), soil bulk density, and nitrogen input to the soil. In contrast, these parameters displayed a significant negative correlation with the C : N ratio of the soil. Furthermore, the canopy openness exhibited a significant positive correlation with net nitrogen mineralization and nitrification rates. These results suggest that structural heterogeneity, which is the gap/canopy mosaic structure, influenced the soil net nitrogen mineralization and nitrification rates in the old-growth forest on Mt. Hakusan.</p>

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