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  Soil organic matter processes: characterization by 13C NMR and 14C measurements

Quideau, S. A., Anderson, M. A., Graham, R. C., Chadwick, O. A., & Trumbore, S. E. (2000). Soil organic matter processes: characterization by 13C NMR and 14C measurements. Forest Ecology and Management, 138(1-3), 19-27. doi:10.1016/S0378-1127(00)00409-6.

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Quideau, S. A., Author
Anderson, M. A., Author
Graham, R. C., Author
Chadwick, O. A., Author
Trumbore, Susan E.1, Author              
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1External Organizations, ou_persistent22              

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Free keywords: carbon TOSS CPMAS C-13 NMR spectroscopy AMS radiocarbon measurements soil fractions San Dimes experimental forest Mediterranean-type ecosystems accelerator mass-spectrometry particle-size 4 decades carbon pine fractions nitrogen dynamics oak
 Abstract: Soil organic matter (SOM) is a central contributor to soil quality as it mediates many of the chemical, physical, and biological processes controlling the capacity of a soil to perform successfully. SOM properties (e.g. C/N ratio, macro-organic matter) have been proposed as diagnostic criteria of overall soil fitness, but their use is hampered by a poor understanding of the basic biochemical principles underlying SOM processes. The objective of this project was to determine the influence of scrub oak. (Quercus dumosa Nutt.) and Coulter pine (Pinus coulteri B. Don) vegetation on decomposition and SOM formation processes in a lysimeter installation constructed in 1936 in the San Gabriel mountains of southern California. Soil samples archived during construction of the installation, and A horizons sampled in 1987, were fractionated according to density and mineral particle size to isolate the water floatable (macro-organic matter), fine silt and clay fractions. Carbon turnover rates were determined on all fractions from AMS C-14 measurements. Solid state CPMAS TOSS C-13 NMR was used to semiquantitatively characterize the chemical structure of organic matter on fresh litter and soil fractions. For the two soils, there was a progressive decrease in O-alkyl C, and an increase in alkyl and carbonyl C from the litter to the floatable, fine silt and clay fractions. These compositional differences were due to the oxidative degradation of the litter material, with preferential decomposition of the cellulose and hemicellulose entities and selective preservation of recalcitrant waxes and resins. in all soil fractions, turnover rates of carbon were longer for the pine than for the oak lysimeter (up to 10 times longer). Also under pine, there was a gradual increase in turnover rate progressing from the floatable to the clay fraction, and differences in turnover rates among fractions may be explained based on differences in carbon chemistry. In contrast, under oak, rapid carbon turnover for all fractions suggested intense biological activity in this soil. (C) 2000 Published by Elsevier Science B.V.

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Language(s): eng - English
 Dates: 2000
 Publication Status: Published in print
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 Identifiers: Other: BEX402
DOI: 10.1016/S0378-1127(00)00409-6
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Title: Forest Ecology and Management
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 138 (1-3) Sequence Number: - Start / End Page: 19 - 27 Identifier: ISSN: 0378-1127
CoNE: https://pure.mpg.de/cone/journals/resource/954925526822