Effects of the conversion of the forest management type from natural deciduous broad-leaved forests to artificial Japanese cypress and Japanese cedar forest on soil fertility

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  • 落葉広葉樹天然林のヒノキおよびスギによる人工林化が土壌の養分特性に及ぼす影響
  • オチバ コウヨウジュ テンネンリン ノ ヒノキ オヨビ スギ ニ ヨル ジンコウリンカ ガ ドジョウ ノ ヨウブン トクセイ ニ オヨボス エイキョウ

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In order to clarify the effects of the conversion of the forest management type from natural deciduous broad-leaved forests to artificial Japanese cypress and Japanese cedar forests on the soil fertility, we investigated the amounts and nutrient contents of the forest floor and soil chemical characteristics (0-30cm depth) in the natural deciduous broad-leaved forests and adjacent artificial Japanese cypress and Japanese cedar (evergreen coniferous) forests. In the artificial evergreen coniferous forests were planted Japanese cypress (Chamaecyparis obtusa) on the upper slope and Japanese cedar (Cryptomeria japonica) on the lower slope. In this study, comparisons of the results were between the natural deciduous broad-leaved forests and artificial evergreen coniferous forests. The soil exchangeable base contents in the cypress forest were almost the same to those of the natural deciduous broad-leaved forest on the upper slope. The soil exchangeable calcium contents in the cedar forest were about 1.9 times greater than those in the natural deciduous broad-leaved forest on the lower slope. The soil carbon and nitrogen contents and CEC in the cypress forest were about 0.6, 0.6, and 0.8 times smaller than those in the natural deciduous broad-leaved forest on the upper slope, respectively. The soil carbon and nitrogen contents and CEC in the cedar forest were almost the same to those of the natural deciduous broad-leaved forest on the lower slope. The amounts on the forest floor were about 7.1Mg/ha in the natural deciduous broad-leaved forests, and about 9.5Mg/ha in the artificial evergreen coniferous forests regardless of the slope position. The C/N ratios of the forest floor in the artificial evergreen coniferous forests were higher than those in the natural deciduous broad-leaved forests. The amounts of calcium in the forest floor significantly correlated with the contents of exchangeable calcium in the soil. The accumulation of calcium in the forest floor was inferred to bring the increase of the exchangeable calcium in the soil.

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