Abstract
To quantitatively clarify the organic carbon accumulation processes on the forest floor during an early stage of humification (3 years), solid-state 13C cross polarization magic angle spinning nuclear magnetic resonance (CPMAS NMR) signals were monitored for phased-humified beech and oak litters and soil surface horizons in the northern Kanto District, Japan. The mass loss rate of the carbon components during the humification for both litters was in the following order: O-alkyl > aromatic > aliphatic > carbonyl carbons. This result indicates that the labile O-alkyl carbons, probably dominated by holocellulose were selectively degraded compared to the other components. 44% of O-alkyl carbon mass for beech and 38% for oak lost throughout 3 years of incubation. Inversely, the mass of aliphatic carbons, which is mainly composed of saturated hydrocarbons, decreased quite slowly from 20 to 10% with humification, probably because a large proportion of the aliphatic carbons are secondary products of microorganisms. The aromatic carbon mass, which would be derived from lignin/tannin and their metabolites, also decreased gradually from 17 to 6% over 3 years. While, the carbonyl carbon mass was quite stable at around 2% throughout the incubation period, probably because the hydrolysis reactions of organic carbon would contribute to the formation of the carbonyl carbons. According to an exponential model, the total carbon stocks on the forest floor converged at 4.2 Mg C ha- 1 for the first few years at the studying site. The carbon compositions converged to intermediate levels between those of the F and A1 horizons. The simulation in the present study is able to represent the carbon accumulation process on the forest floor including a part of the mineral.
| Original language | English |
|---|---|
| Pages (from-to) | 351-356 |
| Number of pages | 6 |
| Journal | Geoderma |
| Volume | 151 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - Jul 15 2009 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Soil Science
Cite this
Organic carbon accumulation processes on a forest floor during an early humification stage in a temperate deciduous forest in Japan : Evaluations of chemical compositional changes by 13C NMR and their decomposition rates from litterbag experiment. / Ono, Kenji; Hirai, Keizo; Morita, Sayaka; Ohse, Kenji; Hiradate, Syuntaro.
In: Geoderma, Vol. 151, No. 3-4, 15.07.2009, p. 351-356.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Organic carbon accumulation processes on a forest floor during an early humification stage in a temperate deciduous forest in Japan
T2 - Evaluations of chemical compositional changes by 13C NMR and their decomposition rates from litterbag experiment
AU - Ono, Kenji
AU - Hirai, Keizo
AU - Morita, Sayaka
AU - Ohse, Kenji
AU - Hiradate, Syuntaro
PY - 2009/7/15
Y1 - 2009/7/15
N2 - To quantitatively clarify the organic carbon accumulation processes on the forest floor during an early stage of humification (3 years), solid-state 13C cross polarization magic angle spinning nuclear magnetic resonance (CPMAS NMR) signals were monitored for phased-humified beech and oak litters and soil surface horizons in the northern Kanto District, Japan. The mass loss rate of the carbon components during the humification for both litters was in the following order: O-alkyl > aromatic > aliphatic > carbonyl carbons. This result indicates that the labile O-alkyl carbons, probably dominated by holocellulose were selectively degraded compared to the other components. 44% of O-alkyl carbon mass for beech and 38% for oak lost throughout 3 years of incubation. Inversely, the mass of aliphatic carbons, which is mainly composed of saturated hydrocarbons, decreased quite slowly from 20 to 10% with humification, probably because a large proportion of the aliphatic carbons are secondary products of microorganisms. The aromatic carbon mass, which would be derived from lignin/tannin and their metabolites, also decreased gradually from 17 to 6% over 3 years. While, the carbonyl carbon mass was quite stable at around 2% throughout the incubation period, probably because the hydrolysis reactions of organic carbon would contribute to the formation of the carbonyl carbons. According to an exponential model, the total carbon stocks on the forest floor converged at 4.2 Mg C ha- 1 for the first few years at the studying site. The carbon compositions converged to intermediate levels between those of the F and A1 horizons. The simulation in the present study is able to represent the carbon accumulation process on the forest floor including a part of the mineral.
AB - To quantitatively clarify the organic carbon accumulation processes on the forest floor during an early stage of humification (3 years), solid-state 13C cross polarization magic angle spinning nuclear magnetic resonance (CPMAS NMR) signals were monitored for phased-humified beech and oak litters and soil surface horizons in the northern Kanto District, Japan. The mass loss rate of the carbon components during the humification for both litters was in the following order: O-alkyl > aromatic > aliphatic > carbonyl carbons. This result indicates that the labile O-alkyl carbons, probably dominated by holocellulose were selectively degraded compared to the other components. 44% of O-alkyl carbon mass for beech and 38% for oak lost throughout 3 years of incubation. Inversely, the mass of aliphatic carbons, which is mainly composed of saturated hydrocarbons, decreased quite slowly from 20 to 10% with humification, probably because a large proportion of the aliphatic carbons are secondary products of microorganisms. The aromatic carbon mass, which would be derived from lignin/tannin and their metabolites, also decreased gradually from 17 to 6% over 3 years. While, the carbonyl carbon mass was quite stable at around 2% throughout the incubation period, probably because the hydrolysis reactions of organic carbon would contribute to the formation of the carbonyl carbons. According to an exponential model, the total carbon stocks on the forest floor converged at 4.2 Mg C ha- 1 for the first few years at the studying site. The carbon compositions converged to intermediate levels between those of the F and A1 horizons. The simulation in the present study is able to represent the carbon accumulation process on the forest floor including a part of the mineral.
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U2 - 10.1016/j.geoderma.2009.05.001
DO - 10.1016/j.geoderma.2009.05.001
M3 - Article
AN - SCOPUS:67349145734
VL - 151
SP - 351
EP - 356
JO - Geoderma
JF - Geoderma
SN - 0016-7061
IS - 3-4
ER -