富山県産裸子植物の分布の特徴

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タイトル別名
  • トヤマケンサン ラシショクブツ ノ ブンプ ノ トクチョウ
  • The characteristics of the distribution of Gymnosperms in Toyama Prefecture

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富山県産裸子植物24分類群について，メッシュ気候値から得た87環境因子の平均値を用いたクラスター分析（ユークリッド距離，Ward法）を行った結果，（1）ハイマツグループ（トウヒ，オオシラビソ，コメツガ，ウラジロモミ，カラマツ，ハイマツなど），（2）クロベグループ（キャラボク，ゴヨウマツ，アシュウスギ，ヒノキなど），（3）モミグループ（クロマツ，アカマツ，モミなど）の3つのグループに分けることができた．各グループの特徴は，（1）ハイマツグループ：標高が高く，寒冷で，夏に降水量が多い内陸型気候に分布する，（2）クロベグループ：ハイマツグループとモミグループの間に位置する標高帯で，降水量が多い場所に分布する，（3）モミグループ：標高が低く，温暖で，冬に降水量が多い日本海側気候に分布すること，などであった．

The characteristics of the distribution of twenty four taxa in Gymnosperms in Toyama Prefecture were examined with eighty seven environmental factors obtained from Mesh Climatic Normal Values (Japan Meteorological Agency, 2016). The taxa treated here are fourteen taxa of Pinaceae, seven taxa of Cupressaceae and three taxa of Taxaceae. The environmental factors are monthly and annual value of precipitation, mean temperature, maximum mean temperature, minimum mean temperature, day length and amount of solar radiation, monthly maximum snow deposit and annual maximum snow deposit, WI, CI, Nihonkai index proposed by Suzuki and Suzuki (1971), and altitude. The data of range of twenty four taxa were provide from the specimen description in TOYA, literature and field note of authors. The analysis of the range of characteristics were used cluster analysis and one-way ANOVA. Abies homolepis ranged in the meshes where had fewer precipitation and longer day length in January than that of A. mariesii. A. veitchii ranged in the meshes where had fewer precipitation and more amount of solar radiation in January than that of A. mariesii. There was no significant differeces between A. homolepis and A. veitchii in this analysis. Larix kaempferi ranged in the meshes where had fewer precipitation in August and snow deposit in March than that of Picea jezoensis var. hondoensis. Tsuga sieboldii ranged in the meshes more precipitation in August and shorter day length in September than that of Tsuga diversifolia. Six taxa of Pinus showed significantly differences respectively in monthly mean temperature in November and monthly mean minimum temperature in March. Chamaecyparis obtusa ranged in the meshes where had lower monthly mean temperature in January and amount of solar radiation in November. Juniperus rigida ranged in the meshes where had more precipitation in May and day length in January than that of J. conferta. There was no significant differences between Cryptomeria japonica and Thuja standishii. Taxus cuspdata ranged in the meshes where had lower annual mean temperature and deeper snow maximum deposit than that of Cepharotaxus harringtonia var. nana and Torrerya nucifera var. radicans.

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