塩風害と海岸林

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タイトル別名
  • SALT SPRAY DAMAGE TO THE COASTAL FOREST
  • シオ フウガイ ト カイガンリン

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I. Two groups of leaves under the ordinary salt spray are recognized : A) Deposit Type : Cl' deposits on their surface and scarcely enters into the tissue of the leaves. Therefore the leaves are not injured. The leaves of the ever-green trees generally belong to this group. B) Entrance Type : Cl' soon enters into the leaves and damages are found. The leaves of deciduous trees generally belong to this group. II. Daphniphyllum glaucescens, Cinnamomum japonicum, Camellia japonica, Ilex integ a, Textoria trijida and Machilus Thubnergii belong to the deposit type above-mentioned. The coastal forest in Central Japan mainly consists of these species. III. Ficus erecta, Celtis sinensis, Mallotus japonicus and Clerodendron trichotomum have leaves of the entrance type. These species can be found in the area protected with the plants of the deposit type. IV. Even when a large amount of Cl' (1〜2 % Cl' of oven dry weight) enters into the leaves of Euonymus japonica, Pittosporum Tobira and Elaeagnus macrophylla, they are scarcely injured. These species are usually found in the front part of the coastal forest. V.Under special strong salt spray, for example, as caused by a typhoon, even the leaves of the deposit type are effected by the so-called V shaped damage. In such cases a large amount of Cl' (2〜3 % of oven dry weight) is found in the damaged part of the leaves. VI. It is concluded that the damage caused by the wind-transported salt spray is due to the Cl' entering into the tissue of leaves.

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