Journal
GEODERMA
Volume 151, Issue 3-4, Pages 351-356Publisher
ELSEVIER
DOI: 10.1016/j.geoderma.2009.05.001
Keywords
Solid-state (13)CPMAS NMR; Litterbag experiment; Humification; Carbon component of humified litter; Forest floor
Categories
Funding
- Japanese Ministry of the Environment [A1120]
- Japanese Ministry of Education, Culture, Sports, Science, and Technology for Young Scientists [20780122]
- Grants-in-Aid for Scientific Research [20780122] Funding Source: KAKEN
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To quantitatively clarify the organic carbon accumulation processes on the forest floor during an early stage of humification (3 years), solid-state C-13 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 A(1) 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. (C) 2009 Elsevier B.V. All rights reserved.
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