The Quaternary Research (Daiyonki-Kenkyu)
Online ISSN : 1881-8129
Print ISSN : 0418-2642
ISSN-L : 0418-2642
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Volume 44, Issue 5
Displaying 1-3 of 3 articles from this issue
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  • Vegetation Changes since the Last Glacial Period around the Itachino Mire in the Kochi Plain, Southwestern Japan
    Nao Miyake, Jun Nakamura, Mitsuo Yamanaka, Mika Miyake, Shingo Ishikaw ...
    2005 Volume 44 Issue 5 Pages 275-287
    Published: October 01, 2005
    Released on J-STAGE: August 21, 2009
    DOIhttps://doi.org/10.4116/jaqua.44.275
    JOURNAL FREE ACCESS
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    The fossil pollen record of a core from the Itachino Mire in the Kochi Plain, southwestern Japan, yields vegetation changes since the last glacial period, especially the development process of Cryptomeria japonica forests. During the interstade (isotope stage 3), temperate conifer forests dominated by Cryptomeria japonica, Abies, and Tsuga covered the hill areas around the study site. Warm temperate deciduous trees, Lagerstroemia and Paliurus, also appeared. Alnus (probably, A. japonica) forests predominated in the mires. At late isotope stage 3 (ca. 30, 000yrs BP), Cryptomeria japonica declined conspicuously. During isotope stage 2, Tsuga and Abies were dominant, associated with Quercus subgen. Quercus and Fagus crenata. In the mire, Alnus forests were replaced by wetland herbaceous vegetation consisting mainly of Sanguisorba, Umbelliferae, and Gramineae. In the early post-glacial period (isotope stage 1), Myrica rubra, one of the evergreen broadleaved trees, appears to have dominated the forests for a short time. At ca. 8, 000yrs BP, evergreen broad-leaved forests, including Quercus subgen. Cyclobalanopsis and Castanopsis, were widely established. From ca. 1, 700yrs BP to the present, the forests were partly replaced by secondary forests of Pinus and Myrica rubra due to intensive forest destruction by human activities.
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  • Research on Black Plant Particles in Ando-soils Distributed around Lake Biwa, Central Japan, with a New Avenue of Research on Charcoal Particles in Ando-soils
    Jun Inoue, Shusaku Yoshikawa
    2005 Volume 44 Issue 5 Pages 289-296
    Published: October 01, 2005
    Released on J-STAGE: August 21, 2009
    DOIhttps://doi.org/10.4116/jaqua.44.289
    JOURNAL FREE ACCESS
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    Ando-soils are distributed widely in Japan. Previous studies showed black plant particles included in Ando-soils that are considered as charcoal particles. Our studies confirmed that black plant particles in Ando-soils distributed around Lake Biwa are charcoal particles by observation of reflectance microscopy, reflectance measurements, and H/C ratio analysis. These black plant particles shine white under reflectance microscopy, and have higher reflectance and lower H/C ratios similar to modern charcoal. These results prove that charcoal particles are included in Ando-soils in this area. The values of reflectance and H/C ratio suggest that charcoal particles were probably the result of forest fires or grass fires. The charcoal concentration increases from upper AT Volcanic glass-rich stratum to K-Ah Volcanic glass-rich stratum. This tendency is almost consistent with that of charcoal concentrations in Lake Biwa sediments. Therefore, some charcoal particles in Lake Biwa sediments are probably derived from fires in Ando-soils distributed in areas around Lake Biwa.
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  • Modern Morphometrics : A Tool for Analysis of Form in Paleontology, Anthropology and Archeology
    T. Ubukata
    2005 Volume 44 Issue 5 Pages 297-313
    Published: October 01, 2005
    Released on J-STAGE: August 21, 2009
    DOIhttps://doi.org/10.4116/jaqua.44.297
    JOURNAL FREE ACCESS
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