Vegetation Science
Online ISSN : 2189-4809
Print ISSN : 1342-2448
ISSN-L : 1342-2448
Volume 19, Issue 2
Displaying 1-5 of 5 articles from this issue
  • Takayoshi NISHIO, Nobumasa ICHIZEN, Jingyu SUN, Xiaojing LIU, Toshiaki ...
    Article type: Article
    2002 Volume 19 Issue 2 Pages 73-81
    Published: December 25, 2002
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    Relation between spring wheat (Triticum aestivum L.) production and vegetation types were investigated in the saline soil areas of Huang-Huai-Hai Plain, China. The total of 23 quadrats were sampled and six plant communities were classified by tabular sorting and rearrangement : Salsola collina-Eriochloa villosa community, Suaeda glauca community, Lactuca tatarica- Suaeda heteroptera community, Phragmites communis community, Suaeda heteroptera community, and Suaeda heteroptera-Aeluropus littoralis community. These communities were consisted of only 20 species in total, most of stands had five species or less, and some of them were characterized by one or two dominant species. Some soil properties of the soil were compared between classified communities. The soil salinity was the highest in S. heteroptera-A. littoralis community (0.74%), followed by S. heteroptera community (0.48%), P. communis community (0.42%), L. tatarica-S. heteroptera community (0.27%), S. glauca community (0.24%) and S. collina-E. villosa community (0.06%). The rank for sodium, chlorine and sulfate content between the communities was roughly consistent with that of soil salinity. Content of potassium, calcium and magnesium was the lowest in S. collina-E. villosa community. The yields of spring wheat were measured by the plant height, the number of ear, the ear weight and the 1000-grain weight for each experimental fields that are independently established within the typical areas of each plant community. These measurements showed negative correlation between the yields of spring wheat and salt, Na, Cl, SO_4 in soil. The yields of spring wheat drastically decreased at 0.3% of soil salinity. It was concluded that adequate amount of wheat yields can be expected from both S. collina-E. villosa community and S. glauca community, whereas hardly any wheat harvest was expected from the other four communities.
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  • Hiroaki ISHIDA, Kanako TOI, Yoshiaki TAKEDA, Tamotsu HATTORI
    Article type: Article
    2002 Volume 19 Issue 2 Pages 83-94
    Published: December 25, 2002
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    Nineteen fragmented secondary forests distributed in the urban landscape of the Senri Hills in Osaka Pref. were investigated. The relationship between the number of secondary species (species showing habitat preference for secondary forest) and area of the forest was analysed using the species-log area and the log species-log area models, and in both models the correlation between the number of species and area was related by a highly significant linear regression. Compared with the fragmented secondary forests in Flower Town, Hyogo Pref., the forests in the study area were found to have fewer species. It seemed that the major causes for this were the differences between the two areas in the time and degree of previous use for secondary forest, or in the time of isolation. The secondary species were classified into three groups by the similarity of distributional pattern with respect to the decrease of area. Herbaceous species that prefered mesic habitat tended to be absent in smaller forests, probably because of the dryness of the soil and the lack of mesic microlandforms. In Flower Town, Hyogo Pref. Prunus verecunda, Styrax japonicus, Pourthiaea villosa, Rhododendron reticulatum, etc. were unaffected by the decrease of area, but in the study area they showed a tendency to be absent with decreasing area.
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  • Akira KIKUCHI, Yuichi ONDA, Nobukazu NAKAGOSHI
    Article type: Article
    2002 Volume 19 Issue 2 Pages 95-111
    Published: December 25, 2002
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    The relationship between vegetation and groundwater flow in a small spring-fed wetland without a peat was surveyed in Hiroshima Prefecture, southwestern Japan. Detailed groundwater flow was measured with piezometer nests consisting of piezometers and groundwater wells. These piezometers were laid out into two lines extending from hillslope to the valley bottom. Plant communities of field layer and profiles of vegetation were surveyed along settled piezometer nests. All surveyed communities were classified into nine vegetation types. Wetland vegetation was characterized by Moliniopsis japonica and it was classified into two types, i.e. graminoids dominant open type and wetland forest type. In spite of the differences in vegetation physiognomy, both open and forested habitats featured the following groundwater table : over 20 cm in moist period and over 40 cm in common period. The difference of the two period was below 15 cm. On the other hand, the hydraulic gradient explained the difference of these communities. Thus, gramineous vegetation developed at the center of the wetland where upward seepage occurred. Trees were not found right above the upward seepage but were distributed in marginal zone of the wetland where downstream movement of ground water emerged. These results suggest that groundwater seepage offers a habitat of graminoids dominant vegetation thus preventing forest development. In contrast, groundwater-sinking flow provides a habitat for a wetland forest development.
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  • Koji SUGIMURA, Susumu OKITSU
    Article type: Article
    2002 Volume 19 Issue 2 Pages 113-124
    Published: December 25, 2002
    Released on J-STAGE: January 06, 2017
    JOURNAL FREE ACCESS
    The species richness of forest floor bryophytes in montane forests was examined on Mt. Tsukuba, Ibaraki Prefecture, Japan, in relation to both the overstory tree species and the coverage of leaf-litter and rocks on the forest floor. The composition and species richness of bryophytes were not affected by the composition of overstory trees nor the height and coverage of tree layer. The number of bryophyte species increased with a decrease of leaf-litter coverage, but were correlated with the rock coverage more strongly than the leaf-litter coverage. The number of growth forms of bryophytes was larger and the stratification of the bryophyte community was more complicated on big rocks than small ones. The results suggest that rocks, especially large-sized rocks, provide a favorable habitat for bryophytes on the forest floor of temperate forests.
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