Journal of the Japanese Society of Revegetation Technology
Online ISSN : 1884-3670
Print ISSN : 0916-7439
ISSN-L : 0916-7439
Volume 40, Issue 2
No. 4
Displaying 1-11 of 11 articles from this issue
SPECIAL ISSUE
ORIGINAL ARTICLE
  • Chiaki OTSU, Yoshiko KOBAYASHI, Takuo NAGAIKE
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 2 Pages 365-371
    Published: 2014
    Released on J-STAGE: September 18, 2015
    JOURNAL FREE ACCESS
    To determine the factors contributing to both the control of erosion and the establishment of indigenous species dispersed from vegetation surrounding slopes in the early stages, we investigated the influence of location and construction methods on the occurrence of erosion and indigenous species cover at 293 sites located on slopes, which had been constructed within the past five years in Yamanashi prefecture, using a generalized linear mixed model. Erosion of the surface layer was observed in 37% of the study sites. The mean plant cover at all sites was relatively high, although there were few slopes where indigenous species were observed. Sites sprayed with a soil/seed cultivation base and located in valleys had a greater coverage by indigenous species and were considered to have established indigenous species faster than the other sites studied. In contrast, the use of a thick cultivated base spraying method and revegetation mats helped to control erosion, while both methods suppressed the establishment of indigenous species. The results suggest that either the control of erosion or the establishment of indigenous species on the slopes should be prioritized when selecting which revegetation method to use. To create favorable conditions for both slope stability and the establishment of an indigenous species community on cut slopes, it is important to consider the selection of revegetation methods, the composition of plant species introduced, and the control of wildlife damage.
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  • Masao NAGATOME, Jun NEMOTO, Masayo TERADA,-SADACHI, Kiyoshi UMEKI, Tat ...
    Article type: ORIGINAL ARTICLE
    2014 Volume 40 Issue 2 Pages 372-386
    Published: 2014
    Released on J-STAGE: September 18, 2015
    JOURNAL FREE ACCESS
    The effects of dominant forest canopy species and leaf raking treatment on the demography of Lilium auratum Lindley were investigated from 2006 to 2008 and 2011 to 2013 in Musashi-Kyuryo National Government Park, central Japan. Individual plants were classified into three stages: juvenile, bolting, and flowering. The juvenile stage was subdivided into three size classes (J1, J2, and J3) and the bolting stage was subdivided into two size classes (B1 and B2) . Individuals in the juvenile stages stayed in the same stage for 7 ∼ 9 years before they reached the bolting stage. When individuals progressed from J3 to B1, survival rates decreased to values similar to those for individuals in J1. As deciduous tree species became dominant in the canopy layer, the transition rates from juvenile stages to bolting stages decreased. The elasticity values calculated in this study from stage projection (Lefkovitch) matrices showed that the importance of the survival (stasis) in the flowering stage on population growth rate was not prominent, unlike for other herbaceous species. The leaf raking practice increased the recruitment rate of new seedlings and consequently increased the population growth rate. Adults of L. auratum may use a switching reproductive strategy by which they can change their allocation pattern from sexual to asexual reproduction or vice versa depending on the thickness of the A0 horizon.
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