Nutritional Properties of Trees and Soils in Oku-Nikko Region, central Japan

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Other Title
  • 奥日光の森林衰退地域の樹木生葉と土壌の養分特性
  • 奥日光の森林衰退地域の樹木生葉と土壌の養分特性--他の亜高山地域との比較から
  • オクニッコウ ノ シンリン スイタイ チイキ ノ ジュモク セイヨウ ト ドジョウ ノ ヨウブン トクセイ タ ノ アコウザン チイキ ト ノ ヒカク カラ
  • －他の亜高山地域との比較から－
  • -Comparisons with the other subalpine regions-

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Abstract

The nutrient properties of the foliage and soil of the Oku-Nikko region in Tochigi Prefecture, central Japan, were investigated to understand the mechanism of forest decline in this region. The foliar Mg concentration and Mg/Ca ratio were lower in Tsuga diversifolia (Maxim.) Masters collected from the Oku-Nikko region rather than in specimens from other sub-alpine regions. Furthermore, the concentration of exchangeable Mg and the exchangeable Mg/Ca ratio of soils from the Oku-Nikko region were lower than in other sub-alpine regions in all horizons. The soils in the Oku-Nikko region had the same pH and the same exchangeable Al concentrations as those in other sub-alpine regions. Therefore, it is difficult to postulate that Mg had leached from every horizon as a result of acid deposition in the Oku-Nikko region. Since every horizon had a constant Mg/Ca ratio, this soil property is probably a geological origin. The results indicated that soil acidification had not accelerated, but the soil properties affect the low Mg level in the foliage of Tsuga diversifolia, one of the declining species in the Oku-Nikko region. In this region, Mg deficiency in Tsuga diversifolia resulting from low soil Mg might decrease the species tolerance to various environmental stresses.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 22 (6), 401-414, 2009

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

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