Journal of the Japanese Institute of Landscape Architects
Online ISSN : 2185-3053
Print ISSN : 0387-7248
ISSN-L : 0387-7248
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Volume 51, Issue 4
Displaying 1-3 of 3 articles from this issue
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  • Studies on Inhabitant Insects in Parks and Open Spaces, covered with Substitution Forest, in Suburban Areas
    Masafumi SHIMADA, Yorikazu MARUTA
    1987 Volume 51 Issue 4 Pages 219-227
    Published: March 20, 1987
    Released on J-STAGE: July 19, 2011
    DOIhttps://doi.org/10.5632/jila1934.51.219
    JOURNAL FREE ACCESS
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    It is necessary to give full consideration to the existence of a natural ecosystem in planning parks and open spaces. It is particulary important to be concerned with inhabitant insects, which are important members of the food chain.
    This research study focused on the relation between the land insects, the physiognomical vegetation and the maintenance in a substitution forest that has returned to a natural condition. Chikouzan Park in Sayama city, a suburb of Tokyo, was selected for this study.
    The results are summarized as follows;
    (1) 233 species of insects were caught with nets and bait-traps for investigation. Many insects were found in the copse, grasslands, marshes and around the ponds.
    (2) The number and variety of insects were greatest in areas with many deciduous trees, in areas with heavy undergrowth such as shrubs and grasses and around the perimeter of the groves.
    Grassland is important as a habitat for Orthoptera insects, and the marshes and ponds as habitats for Odonata insects and for insects that eat marsh plants.
    (3) The existence of large population and large number of species of insects depend upon creating and maintaining a variety of environmental conditions in the park.
    Over maintenance in the park creates environmental condition that adversely affect the population and variety of inhabitant insects.
    (4) It is necessary to designate protection zone for insects and areas for public use in the park. The natural multiformity condition of the insects Sanctuaries should be preserved.
    (5) It is necessary to plant vegetation in the public use areas to attract suitable inhabitant insects.
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  • Guiding principle on estabulishment and management of Erythronium japonicum DECNE. population
    Shinobu YABU
    1987 Volume 51 Issue 4 Pages 228-236
    Published: March 20, 1987
    Released on J-STAGE: July 19, 2011
    DOIhttps://doi.org/10.5632/jila1934.51.228
    JOURNAL FREE ACCESS
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    The object of this study is to establish the conservational practice of Erythronium japonicum Decne. population. Ecological studies of its population were carried out in hilly countries of mainly Tochigi, Tokyo and Fukui Prefecture. Moreover informations on its conser-vational practice, were extracted from past papers.
    Results are as follows.
    1. Site conditions suitable for formation of E. japonicum population
    (1) Orientation of slope: Facing north
    (2) Topography: Lower part of slope or vally and slope gradient below 30°
    (3) Physiognomic vegetation: Deciduous broadleaved forest
    (4) Plant group as indicator of proper soil condition: Orixa japonica, Lycoris sanguinea, Anemone flaccida, Anemone nikoensis, Kerria japonica, Hydrangea macrophylla, etc.
    2. Method of seeding
    (1) Term of seed production: From the middle of May to the end of its month (Suzuki, 1984)
    (2) Seeding: Immediate seeding after harvest (Suzuki, 1984; Fukuda. 1987)
    3. Maintenance procedure
    (1) Light condition: Keeping more than 40% in relative light intensity on the forest floor in spring (Yabu, et al., 1985)
    (2) Regulation of competitive plants: Brush cutting once a year in summer
    (3) Control of disease: In order to defend against the rust of fungus Uromyces erythronii Pass. It is necessary to remove the damaged leaves on the forest floor between the end of April and May (Nakamura, 1985; 1987).
    (4) Others: To avoid serious soil compaction on E. japonicum habitat which results from excess human trampling, preparation of nature trail and enclosing its habitat with a fence, are recommended.
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  • The characteristic style and techniques of old gardens in Shinshu
    Motomi OGUCHI
    1987 Volume 51 Issue 4 Pages 237-242
    Published: March 20, 1987
    Released on J-STAGE: July 19, 2011
    DOIhttps://doi.org/10.5632/jila1934.51.237
    JOURNAL FREE ACCESS
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    I have been studied the history of traditional gardens in Shinshu, Nagano Prefecture, over 15 years. There are about one hundred traditional gardens in Shinshu. The oldest is Kouzenji garden (Komagane City) constructed in the Kamakura era, which is only one garden before the Edo era. About ten gardens constructed in the early Edo era have been leaved, and others were constructed in the middle and late Edo era. After these survey I discussed the characteristics of style and techniques of gardens.
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