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Volume 54 (2012)
- Issue 2 Pages 47-
- Issue 1 Pages 1-
Volume 54, Issue 1
Displaying 1-4 of 4 articles from this issue
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Shogo Kato, Toshinari Kanematsu, Nobumitsu Kawakubo, Akira KomiyamaArticle type: Article
2012 Volume 54 Issue 1 Pages 1-5
Published: June 25, 2012
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSWe investigated phototropism in two liana species with different-climbing habits. The vines Schizophragma hydrangeoides and Parthenocissus tricuspidata use roots and adhesive-tendrils to climb, respectively. While these two species showed similar behaviors when exposed to light, illumination experiments detected very interesting responses when different stages of growth were studied. Short creeping shoots exhibited positive phototropism. Long creeping shoots appeared to show negative phototropism. This change in phototropism according to shoot length implies these climbing vines have adapted habits useful for climbing host trees. Soon after germination, their short shoots need to seek light for rapid growth, but their shoots need to explore the host trees after a certain period of growth. The base of a large host tree, the starting point for climbing, is usually in relatively dark forest floors. The vine's ability to change from positive to negative phototropism would be an essential habit for both types of vines which climb the planar surfaces of their hosts.View full abstractDownload PDF (1138K) -
Satoshi Ito, Tomomi Marutani, Osamu ShimizuArticle type: Article
2012 Volume 54 Issue 1 Pages 7-17
Published: June 25, 2012
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSWe investigated the relationship of vegetation to geomorphology in a V-shaped valley bottom of an incised meandering mountainous stream in a transition zone from fir-hemlock forests to cool-temperate deciduous broad-leaved forests in Kyushu, southwestern Japan. The bank of a channel reach (410 m in length) of a forth-order valley of Oyabu creek was divided into 32 units, and overstory vegetation, slope characteristics, flood frequency and other geomorphic features for 15 m width from the vegetation edge were surveyed. The bank vegetations of 32 units were classified into three types: Tsuga sieboldii forests (ridge type), Quercus crispula forests (secondary broad-leaved type) and Betula grossa forests (valley-bottom type). These types were related to slope forms, soil depth and slope inclination, but not to flooding frequency. These results suggested that the bank vegetation type classified by the overstory species composition in the V-shaped valley was influenced by hillslope processes rather than by the fluvial process of the main creek. The slope forms were related to the incised meander and geomorphic features such as the back slopes and the escarpments. These results suggested that river meander and geomorphic features may also have significant impacts on patch mosaic formation in a riparian strip in a V-shaped valley through the promotion of different bank slope characteristics through long-term lateral erosion processes.View full abstractEditor's pickDownload PDF (1270K) -
Jiro Kodani, Kojiro EsakiArticle type: Article
2012 Volume 54 Issue 1 Pages 19-28
Published: June 25, 2012
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSWe compared the understory vegetation and soil seed bank in three areas of the bamboo (Phyllostachys pubescens) forests which have different process of formation or duration of abandonment. The number of species and/or coverage of understory and the tree density in the bamboo forests abandoned for a shorter period were higher than those in the bamboo forest abandoned for a longer period due to the invasion and growth. The species richness and coverage of trees in bamboo forests where understory vegetation remained relatively rich was not always lower than those in the broad-leaved secondary stands. The species compositions of soil seed bank were different among three areas of the bamboo forests, but the all forests contained many pioneer species. The number of species or the density of buried seeds in bamboo forests were not different among three areas, and tended to be richer than those in surrounding Cryptomeria japonica plantations. As a result, the bamboo forests abandoned for a shorter period is considered to have potential for maintaining the same rich vegetation as broad-leaved secondary forest or C. japonica plantations.View full abstractDownload PDF (1052K) -
Chiharu Migita, Yoosuke Matsumoto, Yukihiro ChibaArticle type: Report
2012 Volume 54 Issue 1 Pages 29-34
Published: June 25, 2012
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESS
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