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Research on tree trunk bark pocket as pollution time capsules

Research Project

Project/Area Number 07808058
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionNationla Institte for Environmental Studies

Principal Investigator

SATAKE Kenichi  National Institute for Environmental Studies Global Environment Division Senior Researcher, 地域環境研究グループ, 総合研究官 (50101051)

Co-Investigator(Kenkyū-buntansha) TANAKA Atsushi  National Institute for Environmental Studies Environment Chemistry Division Chie, 化学環境部, 主任研究員 (80171734)
NISHIKAWA Masataka  National Institute for Environmental Studies Regional Environment Division Chief, 地域環境研究グループ, 主任研究員 (80228171)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywordsbark pocket / lead / heavy metal / monitoring / year ring / モニタリング
Research Abstract

The concentration of lead in bark pockets of tree trunks was investigated for its potential use as an archival indicator of pollution. The bark pocket investigated were those of a conifer, Cryptomeria japonica, formed around 1760-1780 (235-255 years ago) at Nikko about 100 km north of Tokyo, and around 1786-1809 (186-209 years ago) on Yakushima Island, located in a remote southern region of Japan. The lead concentrations in these C.japonica bark prockets, repesenting the total lead accumulation during a period of about 20 years at each site, were 0.1 mug Pb g^<-1> at Nikko and 0.22 mug Pb g^<-1> at Yakushima. In contrast, the lead concentration in the outer bark of C.japonica at the present time is about 150 mug Pb g^<-1> at Nikko (1990) and 1.4mug Pb g^<-1> at Yakushima (1992). The use of leaded gosoline, the main source of lead in atmosphere, was initiated in Jaan in 1949 and reached a maximum during 1960-1965. As the production of leaded gosoline was stopped in 1987, the lead concentration in the outer bark represents the total for a period of about 40 years. Therefore, these results suggest an increase in lead pollution of about three orders of magnitde at Nikko, which is relatively close to Tokyo, and one order of magnitde at Yakshima, which is relatively remote.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report

Research Products

(4 results)

All Other

All Publications

  • [Publications] Kenichi Satake,Atsushi Tanaka,Katsuhiko Kimura: "Accumulation of lead in tree trunk bark pocket as pollution time capsules" the Science of Total Environment. 181. 25-30 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kenichi Satake,Katsuhiko Kimura,Atsushi Tanaka: "Two-hundred-years of shoots of epiphytic moss Brothorella henonii proserved in a bark pocket of Crytomeria japonica" Journal of Bryology. 18. 815-832 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kenichi Satake, Atsushi Tanaka, Katsuhiko Kimura: "Accumulation of lead in tree trunk bark pockets as pollution time capsules." the Science of Total Environment. 181. 25-30 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kenichi Satake, Katsuhiko Kimura, Atsushi Tanaka: "Two-hundred-years old shoots of the epiphytic moss Brotherlla henonii preserved in a bark pocket of the conifer Cryptomeria japonical" Journal of Bryology. 18. 815-832 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary

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Published: 1995-03-31   Modified: 2016-04-21  

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