Abstracts of Annual Meeting of the Geochemical Society of Japan
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51th Annual Meeting of the Geochemical Society of Japan
Displaying 51-100 of 284 articles from this issue
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life
  • Involvement of plants in soil formation - an approach using REE geochemistry -
    SHIN-ICHI WATANABE, TASUKU AKAGI
    Session ID: 1C11
    Published: 2004
    Released on J-STAGE: February 23, 2007
    DOIhttps://doi.org/10.14862/geochemproc.51.0.51.0
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We measured REE concentration of soil and vegetation samples at several points of a rolling land, and discussed the relationship between soil formation and vegetation in terms of REE patterns. The chondrite-normarized pattern of soil from O-horizon, A-horizon and non-silicate fraction of the soil from the A-horizon showed relatively linear and HREE depleted patterns, but the silicate fraction of A-horizon did not. The results were interpreted that 1) vegetation absorbed REE from silicate in soil of B-horizon, and that 2) the silicate fraction in the soil of A-horizon is composed of residual components left unincorporated by local vegetation.
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  • Mechanism of chemical weathering facilitated by plants unraveled using Nd isotope ratio.
    Tasuku Akagi, Tomohiro Miura, Feng-Fu Fu, Kazuo Watanabe
    Session ID: 1C12
    Published: 2004
    Released on J-STAGE: February 23, 2007
    DOIhttps://doi.org/10.14862/geochemproc.51.0.52.0
    CONFERENCE PROCEEDINGS FREE ACCESS
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    To investigate whether the inorganic elements in plants are derived from primary minerals directly, neodymium isotope ratio of plants were measured and compared with soil components. Several species of plants were sampled from the Strengbach catchment, France. Nd isotope ratio varied among species: some showed ratios close to that of feldspar, some showed that close to soil water. The results obtained indicate selective uptake of silicate minerals in soils. The present results would pose a new constraint on the mechanism of nutrition-intake by plants and of chemical weathering facilitated by the presence of plants.
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atmosphere/precipitation
rock/crust, ore deposits
ocean
Poster Presentation
inland water
sediments
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