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Chemical and mineral control of soil carbon turnover in abandoned tropical pasturesAuthor(s): Erika Marin-Spiotta; Christopher W. Swanston; Margaret S. Torn; Whendee L. Silver; Sarah D. Burton
Source: Geoderma. 143: 49-62.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
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DescriptionWe investigated changes in soil carbon (C) cycling with reforestation across a long-term, replicated chronosequence of tropical secondary forests regrowing on abandoned pastures. We applied CP MAS 13C NMR spectroscopy and radiocarbon modeling to soil density fractions from the top 10 cm to track changes in C chemistry and turnover during secondary forest establishment on former pastures. Our results showed that interaggregate, unattached, particulate organic C (free light fraction) and particulate C located inside soil aggregates (occluded light fraction) represent distinct soil C pools with different chemical composition and turnover rates. The signal intensity of the O-alkyl region, primarily representing carbohydrates, decreased, and alkyl C, attributed to recalcitrant waxy compounds and microbially resynthesized lipids, increased from plant litter to soil organic matter and with incorporation into soil aggregates.
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CitationMarin-Spiotta, Erika; Swanston, Christopher W.; Torn, Margaret S.; Silver, Whendee L.; Burton, Sarah D. 2008. Chemical and mineral control of soil carbon turnover in abandoned tropical pastures. Geoderma. 143: 49-62.
Keywordssoil organic matter, density fractionation, radiocarbon, CP MAS 13C NMR spectroscopy, reforestation, land-use change
- Chemical and mineral control of soil carbon turnover in abandoned tropical pastures.
- Soil organic matter dynamics during 80 years of reforestation of tropical pastures
- Comparison of soil organic matter dynamics at five temperate deciduous forests with physical fractionation and radiocarbon measurements
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