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Development of models expressing time-dependent structural variations of soil organic nitrogen

Research Project

Project/Area Number 14360040
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Plant nutrition/Soil science
Research InstitutionNagoya University

Principal Investigator

WATANABE Akira  Nagoya University, Graduate School of Agricultural Sciences, Assoc.Prof., 大学院・生命農学研究科, 助教授 (50231098)

Co-Investigator(Kenkyū-buntansha) KATAYAMA Arata  Nagoya University, Eco Topia Science Institute, Professor, エコトピア科学研究機構, 教授 (60185808)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 2004: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥5,100,000 (Direct Cost: ¥5,100,000)
KeywordsSoil organic nitrogen / Humid acids / Humin / ^<15>N tracer / Natural ^<15>N abundance / Chemical fertilizer / ^<15>N NMR / XPS / 窒素安定同位対比 / X線電子分光法 / 土壌バイオマス / ^<15>N-NMR / X線光電子分光法
Research Abstract

The elucidation of quantitative dynamics and structural variation process of soil organic N during short to long terms was aimed.
1.Tracing of immobilized ^<15>N : Time-dependent variations in amount and composition of various soil organic N fractions derived from ^<15>N-urea were investigated in a 730-day incubation period. The method for correcting contamination of microbial biomass was developed, and the apparent half-life, 0.6 and 3.8 years, were obtained for initial humic acid(HA) and humin N. Peptide/amide-N was major N species in all the fractions, 59-90%, and no significant variations in N composition were observed. Therefore, the humification process such as the formation of aromatic-N has not advanced, and the difference in half-life between HA and humin N could be due to the presence/absence of strong interaction with soil particles.
2.Estimation of middle-term accumulation rate of soil organic N using natural ^<15>N abundance (δ ^<15>) : It was succeeded to estimate the accum … More ulation rate of fertilizer-derived soil or organic N and the mean residence time of immobilized N from time-dependent change in δ ^<15> for three upland fields with continuous application of chemical fertilizer for 6-15 years. Same method was applicable for HA-N, and the obtained value agreed to that estimated from the ^<15>N-tracer experiment.
3.Long-term structural change of HA-N : Long-term structural changes in HA-N were evaluated from the comparison among soils using the degree of humification as an index for years since HA formation. XPS and ^<15>N CPMAS NMR were used to analyze N composition. Positive and negative correlations between the proportions of aromatic-and peptide/amide-N in total-N and the degree of humification, positive correlation between the relative abundances of aromatic N and C, and highest stability of aromatic-N in acid hydrolysis were found. Only indole, praline, and triazine compounds were detected in GC/MS analysis of thermochemolysis products. Based on the relationship between the degree of humification and ^<14>C-age, it was estimated that aromatic-N increases at the rate of 0.03% total-N y^<-1> while amide-N decreases at the rate of 0.05% total-N y^<-1>. Less

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (10 results)

All 2004 Other

All Journal Article (8 results) Publications (2 results)

  • [Journal Article] X-ray photoelectron spectroscopy of nitrogen functional groups in soil humic acids.2004

    • Author(s)
      Abe, T.
    • Journal Title

      Soil Science 169・1

      Pages: 35-43

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Semiquantitative GC/MS analysis of thermochemolysis products of soil humic acids with various degrees of humification.2004

    • Author(s)
      Ikeya, K.
    • Journal Title

      Organic Geochemistry 35・5

      Pages: 583-594

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Chemical characterization of Japanese Humic Substances Society standard soil humic and fulvic acids by spectroscopec and degrative analyses.2004

    • Author(s)
      Watanabe, A.
    • Journal Title

      Humic Substances Research 1・1

      Pages: 18-28

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] X-ray photoelectron spectroscopy of nitrogen functional groups in soil humic acids.2004

    • Author(s)
      Abe, T., Watanabe, A.
    • Journal Title

      Soil Science 169・1

      Pages: 35-43

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Semiquantitative GC/MS analysis of thermochemolysis products of soil humic acids with various degrees of humification.2004

    • Author(s)
      Ikeya, K. et al.
    • Journal Title

      Organic Geochemistry 35・5

      Pages: 583-594

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Chemical characterization of Japanese Humic Substances Society standard soil humic and fulvic acids by spectroscopic and degradative analyses.2004

    • Journal Title

      Humic Substances Research 1・1

      Pages: 18-28

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] X-ray photoelectron spectroscopy of nitrogen functional groups in soil humic acids2004

    • Author(s)
      Abe, T.
    • Journal Title

      Soil Science 169・1

      Pages: 35-43

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Chemical characterization of Japanese Humic Substances Society standard soil humic and fulvic acids by spectroscopic and degradative analyses.2004

    • Author(s)
      Watanabe, A.
    • Journal Title

      Humic Substances Research 1・1

      Pages: 18-28

    • Related Report
      2004 Annual Research Report
  • [Publications] Abe, T., Watanabe, A.: "X-ray photoelectron spectroscopy of nitrogen functional groups in soil humic asids"Soil Science. 169・1. 35-43 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tomonori Abe: "Incorporation of nitrogen from urea fertilizer into soil orgnic matter in rice paddy and cassava upland fields in Indonesia"Soil Science and Plant Nutrition. 48・6. 825-832 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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