タカサゴキジノオの北限地域における分布と生態
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概要
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According to the literatures concerning this subject, Plagiogyria adnata (BL.) BEDD. is distributed in India (southern part?), Thai, Malaysia, Java, Philippines, China (southern part), Formosa, Ryukyu and Japan. In Japan, this species is distributed in Kyushu, Shikoku and Honshu (Yamaguchi, Nara, Kyoto her southern part), Wakayama, Mie, and Shizuoka Prefs. and Isl. Hachijo), Shizuoka Pref. being the northernmost habitat of this species. In Shizuoka Pref., the habitats of this fern are now found in (1) Mikkabi, Mikkabicho, Inasagun, (2) Kamino, Tenryu City, (3) Itasawa, and (4) Ganshoji, Kakegawa City, (5) Iriyamase, Kitomura, Ogasagun, (6) Yainaba, and (7) Hara, Fujieda City, (8) Kurishima, and (9) Matsuno, Shizuoka City, (10) Kiriyama, Amagiugashimacho, Tagata-gun, (11) Numanokawa, Kawazucho, Kamo-gun (cf. Fig. 1). Our research has proved that the habitat in Fudodani, Hara, and Fujieda City forms the largest and the northernmost community in Shizuoka Pref. and Shizuoka City is the northernmost limit of this fern in Japan as well as in Shizuoka Pref. Some environmental factors in the northernmost habitats of this species are as follows : At present, all habitats of this fern range from 34°44' to 35°06' N. lat. and are found from ca. 50m to ca. 420m alt. It is a noticeable fact that these habitats are found on and above the line of the annual mean temperature of 14℃ which can be safely said to be the limit in annual mean temperature for this fern. This fern belongs to the warm temperate zone of Shizuoka Pref. as well as in the other regions of Japan. The vegetation of most of these habitats is the laurel forest in which Shiia dominates. As an example of floristic composition and community structure, especially the habitat of Fudodani, Hara and Fujieda City are presented in Table 2. This fern is always found in a shady and moist place under the forests. pH of the soil in these habitats was from 5.4 to 6.4 and this measurement is almost identical with the study of SHI^6). Therefore, this fern can be said to belong to the acidophilous plant. The kinds of substrata in which this fern grows are basalt, andesite, sandstone, shale, conglomerate, gravel bed, humus and their disintergrated products.
- 1961-10-01
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