Characterization of hydrophobic acid fractions in water-soluble organic matter in Dystric Cambisol and in a stream in a small forested watershed : Seasonal and vertical variations in chemical properties(Soil Chemistry and Soil Mineralogy)
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概要
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Chemical properties of hydrophobic acid (HoA) fractions in water-soluble organic matter in soil and water are concerned with its interactions with mineral soil surfaces and organic pollutants. In 2004 we examined the seasonal and vertical changes in chemical properties of the HoA fraction in a Cambisol profile and compared these properties with those in the HoA fraction of an adjacent stream (aquatic humic substances) in a temperate forested watershed using high performance size exclusion chromatography (HPSEC) and 1^H and <13>^C nuclear magnetic resonance (NMR) spectroscopy. The HoA fractions from Oi, Oe/Oa, A and B horizon soils in summer had lower O-alkyl C proportions than those recorded in samples in other seasons. The proportions of aromatic C in HoA fractions from A and B horizons were highest in summer. These seasonal variations were less significant than variations with soil depth. O-alkyl C proportions in HoA fractions decreased with increasing soil depth from the Oi to the A horizon. The HoA fractions from the B horizon showed a higher alkyl C proportion than samples from other horizons in winter and spring. These changes with soil depth from the Oi to A horizons might result from selective utilization of carbohydrate carbon by microorganisms, whereas those in the B horizon may result from sorption to mineral surfaces. The HoA fractions in the stream were similar in relative molecular weight, distribution of each type of proton and carbon species in HoA fractions from the B horizon, whereas stream HoA fractions collected in summer would be derived from organic horizons. This indicated that vertical changes in the chemical properties of HoA fractions in soil and pathways of water to the stream would largely affect the chemical properties of HoA fractions in the stream.
著者
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ASAKAWA Daichi
The Graduate School of Agricultural Science, Kobe University
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YANAGI Yukiko
The Graduate School of Agricultural Science, Kobe University
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FUJITAKE Nobuhide
The Graduate School of Agricultural Science, Kobe University
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Fujitake Nobuhide
Faculty Of Agriculture Kobe University
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Asakawa Daichi
The Graduate School Of Agricultural Science Kobe University
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Yanagi Yukiko
The Graduate School Of Agricultural Science Kobe University
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Fujitake N
Laboratory Of Soil Science Faculty Of Agriculture Kobe University
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Fujitake Nobuhide
Laboratory Of Soil Science Faculty Of Agriculture Kobe University
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Yanagi Yukiko
Laboratory Of Soil Science Faculty Of Agriculture Kobe University
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MOCHIZUKI Hidemasa
The Graduate School of Science and Technology
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Fujitake N
Graduate School Of Agricultural Sci. Kobe Univ.
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Fujitake Nobuhide
The Graduate School Of Agricultural Science Kobe University
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Fujitake N
Kobe Univ. Kobe Jpn
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Fujitake Nobuhide
Laboratory Of Soil Science Department Of Agro-bioscience Graduate School Of Agricultural Science Kob
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