Characterization of allophanic Andisols by solid-state 13C, 27Al, and 29Si NMR and by C stable isotopic ratio, δ13C

Syuntaro Hiradate, Hideaki Hirai, Hitoshi Hashimoto

Research output: Contribution to journalArticle

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Abstract

Three representative allophanic Andisols in Japan were evaluated by solid-state 13C, 27Al, and 29Si nuclear magnetic resonance (NMR) and stable isotopic ratio of carbon (δ13C). The solid-state cross polarization magic angle spinning (CPMAS) 13C NMR spectra were effective in characterizing crude soil C without any chemical treatment when soil C content was > 100 g C kg- 1. Aliphatic, O-alkyl, and carbonyl C were relatively abundant in the uppermost horizons, whereas aromatic C was concentrated in the subsurface horizons, showing its persistence and tolerance to degradation in subsurface horizons. Contribution ratios of C4-plant-derived C (mainly from Miscanthus sinensis) on the total CRC4 which were evaluated from δ13C value, were 35% to 42%, 59% to 62%, and 50% to 53% in subsurface horizons, and 12%, 23%, and 48% in uppermost horizons, for the three soils. The decline in CRC4 values in the uppermost horizons could be an effect of recent vegetation. Solid-state 27Al and 29Si NMR revealed that most part of the tetrahedral Al in volcanic glass had already weathered into octahedral Al and a large amount of allophanic constituents (allophane, imogolite, allophane-like constituents including protoimogolite) was formed in B horizon within the past 25,000 14C y. Allophanic constituents determined by 29Si NMR were compared with those dissolved by acid-oxalate, and differences between them were discussed.

Original languageEnglish
Pages (from-to)696-707
Number of pages12
JournalGeoderma
Volume136
Issue number3-4
DOIs
Publication statusPublished - Dec 15 2006
Externally publishedYes

Fingerprint

Andisol
Andisols
isotopic ratio
nuclear magnetic resonance
nuclear magnetic resonance spectroscopy
allophane
imogolite
Miscanthus sinensis
soil
C4 plant
volcanic glass
B horizons
C4 plants
chemical treatment
oxalates
oxalate
spinning
aromatic compounds
glass
persistence

All Science Journal Classification (ASJC) codes

  • Soil Science

Cite this

Characterization of allophanic Andisols by solid-state 13C, 27Al, and 29Si NMR and by C stable isotopic ratio, δ13C. / Hiradate, Syuntaro; Hirai, Hideaki; Hashimoto, Hitoshi.

In: Geoderma, Vol. 136, No. 3-4, 15.12.2006, p. 696-707.

Research output: Contribution to journalArticle

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