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Volume 51 (2009)
- Issue 2 Pages 93-
- Issue 1 Pages 1-
Volume 51, Issue 2
Displaying 1-6 of 6 articles from this issue
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Kazunori Shimada, Toshio KatsukiArticle type: Article
2009 Volume 51 Issue 2 Pages 93-103
Published: December 25, 2009
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSWe investigated changes in tree composition between 1993 and 2006, in an abandoned plantation forest following a meteorological damage in 1986. The objective was to elucidate vegetation dynamics in the early phase of secondary succession in relation to micro-topography. On the lower slope (from the lower sideslope to the channelway), almost all tree species died and scrub predominated. On the middle part of the slope (middle and lower parts of the upper sideslope), the numbers of individuals and species of evergreen trees has increased slightly; the number of individuals of the evergreen shrub Aucuba japonica increased greatly; and deciduous trees (especially pioneer trees) grew rapidly and dominated the vegetation, but there was a large decrease in the total number of species and individuals. Consequently, the community developed a simple structure consisting of a tree layer of pioneer trees and a shrub layer of A. japonica. On the upper part of the slope (the crestslope and upper part of the upper sideslope), evergreen trees of Quercus glauca dominated, but the numbers of species and individuals of deciduous trees and shrubs decreased. The differences in forest structure between the lower and middle parts of the slope were clear, but the differences between the middle and upper parts of the slope were gradual. These differences in species composition and number related to slope micro-topography became clear year after year. The results suggest that Q. glauca secondary forests has not been formed by succession from secondary forest pioneer trees.View full abstractDownload PDF (1872K) -
Daisuke Hattori, Kenzo Tanaka, Joseph Jawa Kendawang, Kazuo Irino(Okam ...Article type: Article
2009 Volume 51 Issue 2 Pages 105-115
Published: December 25, 2009
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSEnrichment planting with dipterocarps is required in order to rehabilitate degraded vegetation in tropical Southeast Asia, since tropical rainforests have been damaged by various anthropogenic activities. This study investigated the effects of light and soil properties on the mortality and growth of six dipterocarp species in grassland, secondary forest, and logged forest in the Niah Forest Reserve, Sarawak, Malaysia. Relative light intensity was much higher in the grassland than the forested area, whereas large variations in soil properties were not found. Seedling mortality, height and diameter over 81 months were higher in the grassland than the forested area. Strong light intensity killed many seedlings in the grassland during the first 24 month, though it enhanced the growth of the seedlings that survived. Few survived large seedlings could be one of the targets for ecosystem rehabilitation in the grassland, if the seedlings can dominate the forest structure in the future. In the secondary forest and logged forest, lower light intensity led to lower mortality and growth rate than in the grassland. In the secondary forest, pioneer trees fostered seedlings and produced suitable conditions for their survival. Careful thinning of local trees may enhance the growth of seedlings if necessary. On the other hand, we found interspecific variations. For example, Parashorea macrophylla showed the highest survival rate in the secondary forest, but it did not like very dark conditions. Shorea macrophylla was easily attacked by herbivores. Shorea virescens showed a higher growth rate in the grassland. These interspecific variations should be considered when selecting species for enrichment planting.View full abstractDownload PDF (1501K) -
Yumiko Nakamori, Takeshi Torimaru, Daisuke Hoshino, Shin-ichi Yamamoto ...Article type: Article
2009 Volume 51 Issue 2 Pages 117-125
Published: December 25, 2009
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSForest community dynamics were investigated in relation to topography in two stands (Slope and Ridge stands) of an old-growth temperate mixed coniferous-broadleaved forest in the Sannoko Forest Reserve, south-western Japan. In 1985, all woody stems≧5cm diameter at breast height (DBH) in the plots were identified and marked; the census was repeated in 2002 and 2007. Over the census periods, mortality, recruitment, and mean turnover rates were higher in the Slope than the Ridge stand. The mortality rate in the understory layer was significantly higher in the Slope than the Ridge stand. Species' mean turnover rate was significantly negatively correlated with mean DBH in the Slope but not the Ridge stand. Among the dominant species over the whole period, in both stands, a significant number of conifers died but little recruitment occurred, while broadleaved species populations appeared to be maintained at dynamic equilibriums. Species that dominated the Ridge stand did not exhibit a dynamic equilibrium, unlike those that preferred the Slope stand. The fact that populations of coniferous and ridge-abundant species were not in equilibrium suggests that regeneration properties in the seedling stages, which are linked to specific and infrequent events such as landslide disturbance and/or canopy gap formation, may be important in the maintenance of the population of each species.View full abstractDownload PDF (1088K) -
Mahoko Noguchi, Atsushi Sakai, Shiro Okuda, Yoshiyuki Inagaki, Hidehis ...Article type: Article
2009 Volume 51 Issue 2 Pages 127-136
Published: December 25, 2009
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSWe investigated changes in understory vegetation after heavy thinning in hinoki plantations in Shikoku Island, Japan. We observed the abundance and species diversity of understory vegetation at two experimental sites (Furumiya and Tengu) for 6 years after thinning, where approximately 25% and 50% of trees were removed. Thinning increased the understory vegetation cover at both sites. In the heavily thinned (50%) plots, species richness, and cover and height of individual plant species also showed considerable increase. Although vegetation cover and height increased continuously for several years, species richness increased rapidly in the first year after thinning. The diversity index also increased in the first year and then decreased during the following years. This suggests that newly established species mainly emerged in the first year after thinning, and the following increase in the vegetation cover was caused by the growth of some component species. The Tengu site exhibited a larger increase in vegetation height and species richness, and greater change in species diversity and composition in the heavily thinned plot than did Furumiya. These differences between the sites may have been caused mainly by less initial understory vegetation at Tengu. Differences in climate and land use history may have indirectly affected the change in understory vegetation.View full abstractDownload PDF (1394K) -
Takeshi TangeArticle type: Report
2009 Volume 51 Issue 2 Pages 137-141
Published: December 25, 2009
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESS -
Hidemi TaguchiArticle type: Report
2009 Volume 51 Issue 2 Pages 143-151
Published: December 25, 2009
Released on J-STAGE: April 03, 2017
JOURNAL FREE ACCESSDownload PDF (1544K)
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