南アルプス南部寸又川流域における亜高山帯性針葉樹の分布－前黒法師岳におけるオオシラビソの分布の確認－

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  • ミナミアルプス ナンブ スマタガワ リュウイキ ニ オケル アコウザンタイセイ シンヨウジュ ノ ブンプ マエクロボウシダケ ニ オケル オオシラビソ ノ ブンプ ノ カクニン

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Distribution of subalpine conifers was investigated in the Sumatagawa area, the southern part of the Southern Japan Alps. Abies veitchii was dominant in upper part of subalpine area, and Tsuga diversifolia was dominant in lower part, while Abies mariesii waslessdominant than those species. Abies mariesii was found on Mts. Irodake, Tekaridake , Kagamoriyama , Hyakumatazawanoatama, Shinanomata, Peak 2,320 m, Onezawayama, Daimugensan, Sho-mugensan, and Maekuroboshidake. Among them, Mt. Maekuroboshidake（1,943 m, 35°11’N, 138°4’E）was located southernmost, 12 km southwest from Mt. Daimugensan（35°15’N, 138°9’E）that had been known as the southernmost locality of A . mariesii . Around the summit of Mt. Maekuroboshidake, A. mariesii occurred only in A. veichii-dominant forest more than 1,920 m in altitude. We found six trees more than 2 m in height, many living saplings, and some dead suppressed saplings of A. mariesii.To discuss the persistence of the southernmost population of the species, we need investigation on the structure and dynamics of the population.

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