Structural stability and natural ^<13>C abundance of humic acids in buried volcanic ash soils(Soil Chemistry and Mineralogy)
スポンサーリンク
概要
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To examine the relationships between soil age and the structural stability and natural ^<13>C abundance (δ^<13>C) of humic acids, buried humic layers in volcanic ash soil profiles near Mt Fuji, Japan, namely Yubunebara (present to 10,000 years before present (yBP);n=5) and Ashitaka-Onoue (<1,000-30,000 yBP;n=6), were analyzed. The contents and δ^<13>C values of the fulvic acids (humic substances) and non-humic substances in the fulvic acid fractions were also determined. The degree of humification of the humic acids differed remarkably between the surface and buried layers, and the A_<600>/C value (absorbance at 600 nm mg^<-1> C mL^<-1> of humic acids in 0.1mol L^<-1> NaOH) increased toward the older buried layers. The proportion of aromatic C in total C of the humic acids, estimated using cross polarization/magic angle spinning ^<13>C nuclear magnetic resonance spectroscopy, also increased, whereas the proportions of alkyl and O-alkyl C decreased from the surface toward the older layers. These observations suggested higher stability in the aromatic than aliphatic components and the contribution of aromatic C to the increase in the A_<600>/C value. The composition of the C functional groups did not vary appreciably among layers older than 10,000 yBP. The δ^<13>C value of bulk soil organic matter (SOM) fluctuated in both profiles, suggesting that the proportions of C_3 and C_4 plants grown when each layer was the surface layer differed among the layers. Although, in general, variation in the δ^<13>C value of each humus fraction corresponded to that of bulk SOM, there were significant differences in the δ^<13>C value between the humus fractions and bulk SOM, and the differences were more conspicuous in the younger layers and less conspicuous in the older layers. A negative correlation (with an exception) was also observed between the difference in the δ^<13>C values of humic acids from that of bulk SOM and the relative content of aromatic C in the humic acids. Possible causes of the differences and changes in the δ^<13>C values are discussed.
- 一般社団法人日本土壌肥料学会の論文
著者
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Watanabe Akira
Graduate School Of Bioagricultural Sciences Nagoya University
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Watanabe Akira
Nagoya Univ. Nagoya Jpn
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TAKADA Hisayoshi
Graduate School of Bioagricultural Sciences, Nagoya University
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Takada Hisayoshi
Graduate School Of Bioagricultural Sciences Nagoya University
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