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  1. F300 宇宙地球環境研究所
  2. F300b 紀要
  3. 名古屋大学加速器質量分析計業績報告書
  4. 15

^<14>C年代測定法による土壌中における腐植化の進行にかかる年数評価(タンデトロン加速器質量分析計業績報告2003(平成15)年度)

https://doi.org/10.18999/sumrua.15.174
https://doi.org/10.18999/sumrua.15.174
21d92dc4-4535-4170-ab09-6a41a86effcd
名前 / ファイル ライセンス アクション
KJ00005461773.pdf KJ00005461773.pdf (513.2 kB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2010-06-03
タイトル
タイトル ^<14>C年代測定法による土壌中における腐植化の進行にかかる年数評価(タンデトロン加速器質量分析計業績報告2003(平成15)年度)
その他のタイトル
その他のタイトル Evaluation of years required for the progress of humification in soil using AMS radiocarbon dating technique(Summaries of Researches Using AMS)
著者 渡辺, 彰

× 渡辺, 彰

WEKO 81739

渡辺, 彰

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Watanabe, Akira

× Watanabe, Akira

WEKO 81740

Watanabe, Akira

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高田, 久佳

× 高田, 久佳

WEKO 81741

高田, 久佳

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Takada, Hisayoshi

× Takada, Hisayoshi

WEKO 81742

Takada, Hisayoshi

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池田, 晃子

× 池田, 晃子

WEKO 81743

池田, 晃子

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Ikeda, Akiko

× Ikeda, Akiko

WEKO 81744

Ikeda, Akiko

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中村, 俊夫

× 中村, 俊夫

WEKO 81745

中村, 俊夫

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Nakamura, Toshio

× Nakamura, Toshio

WEKO 81746

Nakamura, Toshio

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権利
権利情報 名古屋大学年代測定資料研究センター
権利
権利情報 本文データは学協会の許諾に基づきCiNiiから複製したものである
抄録
内容記述 Soil organic matter is one of major C pools in biosphere, which play a key role not only in geochemical C cycle related directly to global warming, but also in soil fertility essential for sustainable food production. To understand the dynamics of soil organic matter, the evaluation of its stability associated with composition and chemical structure is important. The stability of humic acids, a major fraction of soil organic matter, has been considered to increase with increasing the degree of humification, which is expressed by two variables of A_<600>/C (absorbance at 600 nm per mg C of humic acids in 0.1 M NaOH) and log(A_<400>/A_<600>)(logarithmic value of the ratio of absorbances at 400 and 600 nm). However, whether the increase in the degree of humification occurs in a soil as time elapses and how many years it requires, if occurs, have never been clarified. In the present study, humic acids obtained from two buried soil layers, Tsubame 8th layer (Ts-8, Myoko, Niigata Prefecture) and Yubunebara IIA horizon (Yu-2, Gotenba, Shizuoka Prefecture), were fractionated into eight subfractions with different degrees of humification, respectively, and then their ^<14>C age were determined. For this purpose, precipitation method using 0.01 M-acetone solutions was applied. In the fractional precipitation, humic acid molecules with higher degrees of humification precipitated at lower concentrations of acetone. The ^<14>C age was also older for the subfractions precipitated at lower concentrations of acetone in both the soils with an exception. Consequently, significant correlations between the ^<14>C age and A_<600>/C or log(A_<400>/A_<600>) were observed in each soil, indicating that the degree of humification of humic acids had increased over the passage of time. The ^<14>C age of the Ts-8 humic acids ranged between 1321-1745 yBP excluding an abnormally old fraction. Since the degree of humification of a Ts-8 subfraction was highest level among the reported values for soil humic acids, it is considered that less than 500 years are enough to reach the final stage of humification. The ^<14>C ages of the Yu-2 samples, 524 to 914 yBP, differed largely from those of the Ts-8 samples. However, regardless of absolute ^<14>C age, the length of years required for the increase in the degree of humification was similar between them and could be estimated using an equation.
内容記述タイプ Abstract
内容記述
内容記述 タンデトロン加速器質量分析計業績報告 Summaries of Researches Using AMS 2003 (平成15)年度
内容記述タイプ Other
出版者
出版者 名古屋大学年代測定資料研究センター
言語
言語 jpn
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
ID登録
ID登録 10.18999/sumrua.15.174
ID登録タイプ JaLC
関連情報
関連タイプ isVersionOf
識別子タイプ URI
関連識別子 http://ci.nii.ac.jp/naid/110007150883/
書誌情報 名古屋大学加速器質量分析計業績報告書

巻 15, p. 174-180, 発行日 2004-03
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