オサバグサの生育環境の地域的違いと植生史との関係 Regional differences in the growth environment of Pteridophyllum racemosum Sieb. et Zucc. and its relation to vegetation history.

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  1.一属一種の日本固有の草本であるオサバグサ Pteridophyllum racemosum Sieb. et Zucc. (ケシ科)の分布と生育環境を現地調査と文献によって調べたところ,落葉広葉樹林に生育する集団(D型)と,常緑針葉樹林に生育する集団(C型)の二型に分けられた. <BR>  2.D型は,奥羽山脈以西の青森,秋田,山形,宮城,福島,新潟県などの日本海側から記録され,標高280-1400mに分布していた.各地域での生育場所の数や広がりは小さく,その多くは小谷沿いの急斜面であった. <BR>  3.C型は,岩手県,および関東・中部地方(栃木,東京,埼玉,山梨,長野,新潟,静岡,岐阜の各県)から記録され,多くは内陸から太平洋側に分布していた.1040-2565mの標高域でみられ,平坦地から緩斜面に生じ,各地域での生育場所の数や広がりは太きかった. <BR>  4.C型とD型の分布域は,積雪量の多少とは対応せず,それぞれ,欝閉した亜高山帯針葉樹林が現在成立している地域(C型)としていない地域(D型),チョウセンゴヨウ,ヒメバラモミ,アカエゾマツなど最終氷期に繁栄した針葉樹が遺存する地域(C型)としない地域(D型),および最終氷期の針葉樹林が後氷期にも存続した地域(C型)と衰退した地域(D型)とに対応していた. <BR>  5.これらのことから,オサバグサは,最終氷期には本州中部以北で地域の別なく針葉樹林に生じていた(C型)が,東北地方日本海側などでは後氷期の多雪化と温暖化による針葉樹林の後退とともに衰退・消滅し,辛うじて一部が沢筋斜面の落葉樹林下などに遺存した(D型)のではないかと考え,その結果,現在の分布態様が生じたと推論した.

The distribution and growth environment of Pteridophyllum racemosum Sieb. et Zucc. (Pr, hereafter), a herbaceous plant of Papaveraceae endemic to Honshu, were studied through field surveys and a literature review. Based on growth environment, the Pr population was divided into two types. The first, named D-type here, comprises the populations shaded by deciduous trees and shrubs, which are mainly situated on the steep lower slopes of small valleys. The second, named C-type, comprises the populations shaded by conifer trees, such as Abies veitchii and A. mariesii, on flat ground or gentle slopes. The horizontal and vertical distributions of these two Pr types are distinct. D-type is distributed mainly in northern Honshu (Aomori, Akita, Yamagata, Miyagi, Fukushima and Niigata) and tends to be on the Sea of Japan side. In contrast, C-type is distributed mainly in central Honshu (Iwate, Fukushima, Tochigi, Tokyo, Saitama, Yamanashi, Nagano, Niigata, Shizuoka and Gifu), and tends to occur inland and in regions on the Pacific side. Vertically, D-type is distributed on a lower elevation (280m-1400m) than C-type (1040m-2565m). Local population size of D-type is generally smaller than that of C-type. The distinction between D- and C-type did not correlated with the snow depth of the areas. Instead, the distributional pattern of C-type or D-type corresponds respectively to the presence or absence of dense coniferous forest, to the survival or extinction of coniferous forest within the area during the Post Glacial Period, and to the presence or absence of some relict conifers, such as Pinus koraiensis, Picea maximowiczii (in central Honshu) and P. glehnii (in northern Honshu), that reportedly covered a wider area in the Last Glacial Period. These facts suggest that the distributional pattern of the two types of Pr might be caused by differences in climatic and vegetational changes between the associated areas during the Post Glacial Period. Thus, on the Sea of Japan side, Pr once growing in coniferous forest (C-type) in the Glacial Period, became mostly extinct due to the collapse of coniferous forests under the heavy snow conditions of the Post Glacial Period, with a few remaining as D-type. In contrast, in inland regions and on the Pacific side, the coniferous forest has continued to survive, so Pr of C-type has also thrived here throughout the Post Glacial Period.

収録刊行物

  • 植生学会誌

    植生学会誌 16(2), 115-129, 1999

    植生学会

参考文献:  96件中 1-96件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    110008145227
  • NII書誌ID(NCID)
    AA11347548
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13422448
  • データ提供元
    CJP書誌  CJP引用  NII-ELS  J-STAGE 
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