The conditions of tree and forest declines of the Kanto Plains in 1999-2001

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  • 関東平野における樹木衰退の1999年～2001年の状況
  • カントウ ヘイヤ ニ オケル ジュモク スイタイ ノ 1999ネン 2001ネン ノ ジョウキョウ

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Abstract

The present conditions of the tree and forest declines were investigated all around the Kanto Plain, central Japan. The decline of Criptomeria japonica was the most remarkable. The declines of evergreen conifer species (Chamaecyparis obtuse, Pinus densiflora, P. thunbergii, Abies firma, Tsuga sieboldii, Podocarpus macrophyllus, Torreya nucifera, Chamaecyparis pisifera, Picea sp., and so on), Ginkgo biloba, and Zelkova serrata were observed. However, declines were hardly observed Matasequoia glyptostroboides and Cadrus deodara. The decline of Criptomeria japonica was observed in the whole area of the Kanto Plain. Especially, the heaviest decline areas of all are an area along Tone River in Gunma Prefecture and Saitama Prefecture, northwestern part of the Kanto Plain, areas along Naka River, and Kuji River and an area around Choshi city, faced to the Pacific Ocean. There were also heavier declined trees around Chiba city and Machida city.

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