Vegetation Science
Online ISSN : 2189-4809
Print ISSN : 1342-2448
ISSN-L : 1342-2448
Volume 15, Issue 1
Displaying 1-8 of 8 articles from this issue
  • Min Cong, Takao Kikuchi
    Article type: Article
    1998 Volume 15 Issue 1 Pages 1-5
    Published: June 25, 1998
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    We examined the seed germination response of representative pioneer plants following a forest fire to short-time heat treatment after incubation for several months. Heat treatment was conducted for the seeds which could not germinate during the initial incubation. Among the twelve species examined, Solanum lyratum Thunb., Broussonetia kazinoki Sieb., Phytolacca americana L., Ampelopsis brevipedunculata Trautv., Vitis coignetiae Pulliat., and Smilax china L. were accelerated in germination by treatment conducted four months and six months after sowing, i.e., 50℃ in the day and 25℃ at night for two days. These results indicate that 1) seeds of these species are at least partly not germinative under conditions of ordinal incubation but that 2) germination of such seeds can be accelerated by heat when they are left under moist, incubation conditions. Such germination behavior is likely to be a characteristic of moist seeds and to occur in pioneer plants at burned sites in Japan, which has a wet, temperate climate.
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  • Hiroko Fujita, Hisako Tachibana
    Article type: Article
    1998 Volume 15 Issue 1 Pages 7-17
    Published: June 25, 1998
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    Shizukari Mire is situated along the south-western Pacific coast of Hokkaido. Once it had a beautiful and excellent landscape due to various community types and high species diversity with many ponds and floating-islands. It was designated as a national natural monument in 1922. But this status was cancelled in 1951. Analysis of old topographical maps and documents revealed that, the reason for the cancellation was not the devastation of the mire but the pressure to develop agricultural lands. The size of the mire was 263 ha in 1917. In 1953, two years after the cancellation, it became 221 ha. Then the mire was converted rapidly into agricultural land and by 1996 it was reduced to only 34 ha. The remaining mire is the center part of the former bog and includes some pond vegetation. Two substitutional community types are recorded at the hollow, the Rhynchospora alba - Drosera rotundifolia community and the Rhynchospora fauriei - Rhynchospora alba community. Most of the remaining mire had been covered with lawn vegetation which has changed into substitutional vegetation, the Rhus trichocarpa - Moliniopsis japonica community by drainage and theft. The conservation and rehabilitation of the mire are needed immediately because the succession is continuing and the remaining mire is in very dangerous condition.
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  • I. E. Jr. Buot, S. Okitsu
    Article type: Article
    1998 Volume 15 Issue 1 Pages 19-32
    Published: June 25, 1998
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    The altitudinal zonation of the montane forest of Mt. Pulog (2924 m altitude), Cordillera mountain range, the highest mountain in Luzon Is., Philippines was described and compared with other mountains in the Philippines and in the tropics. Three vegetation zones were distinguished from ca. 2000 m to 2700 m altitude each indicated by the common dominant species in the site ; Zone I (ca. 2000 m to 2400 m altitude), Finns, zone composed of a distinct pure Pinus forest (ca. 2000 m to 2300 m altitude) and a Pinus-Deutzia-Schefflera forest (ca. 2300 m to 2400 m altitude, Zone II (ca. 2400 m to 2600 m altitude), Lithocarpus-Dacrycarpus-Syzygium-Leptospermum forest and, Zone III (ca. 2600 m to 2700 m altitude), Rhododendron-Clethra-Eurya forest. The floristic character was not similar to the other mountains in southern Luzon and the rest of the Philippines because of the presence of a number of northern types (e.g. Skimmia, Pinus, Ilex and others) on Mt. Pulog. The number of species and species diversity, DBH, and height tended to decrease with increasing altitude. Dominant component species at the upper altitudinal forest zones were found to be the same species forming the understory elements of the lower altitudinal forest zones. The change of the vegetation between each zone was not gradual in contrast with the other tropical mountains. Mt. Pulog appears to be a southern extension of north temperate flora and the northernmost limit of the tropical mossy forest, a unique forest type within the montane zone in the tropics.
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  • Kayo Asami, Michiko Yamato, Tamotsu Hattori
    Article type: Article
    1998 Volume 15 Issue 1 Pages 33-45
    Published: June 25, 1998
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    Imperata cylindrica type grassland on embankment slopes, levee slopes and reclaimed land etc. was studied phytosociologically. The results show that this grassland was recognized as a new association (Erigeronto-Imperatetum cylindricae) characterized by the presence of Erigeron annuus, Rumex acetosa, Solidago altissima etc. and the absence of many character and differential species of Miscanthetea sinensis, Haloragis micrantha, Gentiana scabra var. buergeri, Potentilla freyniana etc. Its geographical distribution in Japan was from Tohoku to Kyushu district. Semi-natural grasslands in Japan are represented by two typical grasslands ; one is mowing grassland dominated by Miscanthus sinensis, the other is grazing grassland dominated by Zoysia japonica. This association is a new type of grassland (weeding grassland dominated by Imperata cylindrica) maintained by two or three weedings per year. The distinguishing factors which differentiate this association from Miscanthus-Zoysia type associations occur in the life-form spectrum, the phytosociological spectrum and naturalized plants ratio, as well as the floristic composition. The association was divided into two seasonal lower units, spring aspect and autumn aspect, and belongs to Miscanthetea sinensis, Caricetalia nervatae and Zoysion japonicae. Furthermore, Erigeronto-Imperaterum cylindricae on levee slopes in Sanda, Hyogo Pref. was divided into two lower units : one is Adenophora triphylla var. japonica lower unit characterized by the presence of Adenophora triphylla var. japonica, Cirsium japonicum, Sanguisorba officinalis etc. ; the other is typical lower unit characterized by the absence of these species. The former unit is distributed on levee slopes with no consolidation and the latter unit is on levee slopes with consolidation.
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  • Ken'ichi Senuma
    Article type: Article
    1998 Volume 15 Issue 1 Pages 47-59
    Published: June 25, 1998
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    Marsh vegetation in the Mino-Mikawa region of Aichi pref., the western part of Shizuoka pref. and the southeastern part of Gifu pref. was examined by Braun-Blanquet's phytosociological method, and compared with similar associations reported from the western parts of Japan. Marsh vegetation in this region is characterized by genus Utricularia, Eriocaulon, and Rhynchospora, and the differentiation of communities is influenced mainly by topographical and stratigraphical features and formative processes of marshes. The vegetation was divided into six communities : 1. Eriocauletum nudicuspis ; 2. Rhynchosporetum chinensis ; 3. Eriocaulon mikawanum community ; 4. Eriocaulon buergerianum community ; 5. Sclerietum rugosae, ass. nov. ; 6. Metanarthecium luteo-viride - Moliniopsis japonica community. These communities are included in the alliance Eriocaulo-Rhynchosporion fujitani. The Sclerietum rugosae was described as a new association in this study. It is characterized by Scleria rugosa var. glabrescens, Scleria rugosa var. rugosa, Drosera spathulata, and Lycopodium cernuum, and is distributed in the Mino-Mikawa region and in low elevations from Kinki to Chugoku district.
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