Japanese Journal of Forest Environment
Online ISSN : 2189-6275
Print ISSN : 0388-8673
ISSN-L : 0388-8673
Volume 48, Issue 1
Displaying 1-8 of 8 articles from this issue
  • Hiromi Tanabe, Yoshiko Abe, Takashi Nakano, Takeshi Tange
    Article type: Article
    2006 Volume 48 Issue 1 Pages 1-8
    Published: June 25, 2006
    Released on J-STAGE: April 03, 2017
    JOURNAL FREE ACCESS
    As part of a study on soil nitrogen (N) dynamics in Pinus densiflora Sieb. et Zucc. forests established on substrata in the early stages of primary succession, we studied seasonal changes in carbon (C) and N concentrations in A_0 horizon and C and N inputs by litterfall and dead fine roots in a mature P. densiflora forest established on a immature substrata on Mt. Fuji lava flow. The litter and coarse humus particles showed reductions in N concentration when belowground temperature increased despite their high C/N ratios (72-131 in the litter; 35-53 in the coarse humus particles). C/N ratios in the litter increased when the N concentration decreased. The increase in C/N ratios were not caused by the input of detritus with high C/N ratios in summer. Because some ectomycorrhizal fungi distribute in the research forest can use N in litter, we presumed that the increase in the C/N ratio from spring to summer when the pine tree grow vigorously, may be caused from the use of N in litter by the pine trees under the symbiosis with the ectomycorrhizal fungi.
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  • Shigehiro Ishizuka, Tadashi Sakata
    Article type: Article
    2006 Volume 48 Issue 1 Pages 9-15
    Published: June 25, 2006
    Released on J-STAGE: April 03, 2017
    JOURNAL FREE ACCESS
    To verify the adaptability of the estimate equation for soil gas diffusivity, we measured the gas diffusion coefficient of intact soil samples at 42 forest sites. Our results suggest that the estimation for Black Soil tends to be evaluated as lower than those of Brown Forest Soil. We propose that modified WLR Marshall Equation and modified Jin and Jury Equation are the best choice for the Japanese Black Soil and Brown Forest Soil, respectively.
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  • Etsuko Kaneyuki, Kaneyuki Nakane
    Article type: Article
    2006 Volume 48 Issue 1 Pages 17-24
    Published: June 25, 2006
    Released on J-STAGE: April 03, 2017
    JOURNAL FREE ACCESS
    Forest soil has the capacity to retain rainwater through what is known as soil porosity. In order to compare the water-retaining capacity of forest soils under different vegetation types, the porosity and the maximum water holding capacity (MWHC) were measured at both unthinned plantations and adjacent natural forest stands, which had developed on the same slope in an upstream basin of the Yoshino River in the Shikoku district of western Japan. Soil samples were taken at 0 to 20 cm depths at each stand. The porosity of the natural forest stands were 6.4% higher than those of the unthinned plantations (p< 0.001). The MWHC was also higher in the natural forest stands, by 8.3% (p< 0.001). The porosity and the MWHC of unthinned plantations were lower than the natural forest stands that have thicker Ao and A horizons. The forest soils with much humus have bigger water-retaining capacity, which may increase by thinning of plantations if the thickness of A horizon increases.
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  • Yuko Miura, Susumu Okitsu
    Article type: Article
    2006 Volume 48 Issue 1 Pages 25-31
    Published: June 25, 2006
    Released on J-STAGE: April 03, 2017
    JOURNAL FREE ACCESS
    The effects of the dispersal behavior of wood mice on the distribution of Q. mongolica var. grosseserrata seedlings were studied in habitats where there is little vegetation cover. Ten, twenty, and eighty-six acorns with a spool were placed in Sasa shrubs, in a block field (a rock lump place), and on the boundary between the two habitat types, respectively. Most acorns in Sasa shrubs were eaten on the spot, all acorns in the block field remained, and about 60% acorns on the boundary were removed. Seventeen of acorns removed from the boundary (N = 51) were carried in the block field, and almost the same number were estimated be carried in Sasa shrubs. Wood mice preferentially moved along fallen trees and cached acorns at considerable density beside rocks (N = 6), but the greater number of acorns was cached at the rocks and soil (N = 11). These results indicate that wood mice used fallen trees and outskirts of rocks as routes of transporting acorns, and cached them in the block field. Seedlings were observed on the outskirts of rocks which wood mice cached many acorns, but not in Sasa shrubs. It was concluded that transporting and caching of acorns into the block field by wood mice could contribute the regeneration of Q. mongolica var. grosseserrata.
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  • Nobuhiko Wakamatsu, Takao Kikuchi
    Article type: Article
    2006 Volume 48 Issue 1 Pages 33-41
    Published: June 25, 2006
    Released on J-STAGE: April 03, 2017
    JOURNAL FREE ACCESS
    Distribution and development of the subalpine Abies mariesii forest varies from mountain to mountain in northeastern Japan. Mt. Kurikoma has the appropriate altitude and temperature conditions for such a forest, but only a few scanty stands of Abies mariesii forest can be found there. This study examined the habitat features of these stands on Mt. Kurikoma and considered the establishment process of the subalpine conifer forest zone in northeastern Japan. Distribution of these forests tended to be on leeward slopes at high altitudes. Such slopes are shielded from the winter wind, and plants are protected from the cold by a deep snow cover. Thickness of soil at Abies mariesii forests was conspicuously thin in comparison with the other plant communities at about 20cm. The soil consisted of humus and organic loam. There was a layer of Towada-a volcanic ash (To-a '. 915 cal yr BP) at the lowest position of the soil layer and just above the basement boulder layer meaning that the establishment of the Abies mariesii forest investigated was not older than the fall out of Towada-a volcanic ash.
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  • Yoosuke MATSUMOTO, Ryuichi TABUCHI, Yasumasa HIRATA, Yoshizo FUJIOKA, ...
    Article type: Report
    2006 Volume 48 Issue 1 Pages 43-56
    Published: June 25, 2006
    Released on J-STAGE: April 03, 2017
    JOURNAL FREE ACCESS
    We surveyed the impact of Tsunami, which slaughtered the coastal zone surrounding Andaman Ocean in December 26th, 2004, on the coastal vegetation at west coast (Krabi, Phuket, Pang-nga, and Ranong) of Malay Peninsula in southern Thailand in middle of March, 2005. Casuarina forests including some plantation aged ca. 30 years old distributed on the sandy beach and natural mangroves developed on riverine and basin peaty habitat were the major forest types in this area. Some Melaleuca forests as well as Coconuts plantations were also observed at interior regions. Serious damages of buildings and/or on human were observed in the beach resorts and fishery villages facing to the Andaman Sea at where the elevation is low. We recognized that mangroves, especially Rhizophora forests could mitigate Tsunami damage by trapping many flown wreckages within the 10m from forest edge, which saved many lives at interior. It was thought that highly developed above ground stilt root system of mangrove contributed to the trapping effects. Remarkable trap effect was not observed in Melaleuca forests and Coconuts plantations with low tree density. Large Casuarina trees at water front were found to be uprooted by erosion and small Casuarina trees were all mown down by direct impact. Unusual defoliation of trees was also observed in many places. Herbs and shrubs grown under the Casuarina stands were also mown down and buried by sand from shallow water of west coast. This sand deposit may present the smooth respiration of mangrove roots and affects on their survival seriously in near future. At the beach forests e. g. Melaleuca forest covered by sea water began to show the chlorosis of leaves and unusual defoliation considered to be the damage by saline condition were observed. We predict that the Tsunami damage of coastal forest appears not only as the direct impact but also appears as the gradual, severe and long lasted deterioration of forest health.
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  • Takeo Tanimoto
    Article type: Comment
    2006 Volume 48 Issue 1 Pages 57-62
    Published: June 25, 2006
    Released on J-STAGE: April 03, 2017
    JOURNAL FREE ACCESS
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  • Masako Kajiura
    Article type: Record
    2006 Volume 48 Issue 1 Pages 63-66
    Published: June 25, 2006
    Released on J-STAGE: April 03, 2017
    JOURNAL FREE ACCESS
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