Hamburg University Radiocarbon Dates IV

Scharpenseel, H. W.; Schiffmann, H.; Becker, Peter

doi:10.1017/s0033822200006743

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…Several investigators (36,38,53,(55)(56)(57)(58) have shown that repeated extractions of SOM with acids and bases of increasing strength will leave a residue with a lower 14 C͞ 12 C ratio than the starting material (a density separation is performed first to remove relatively intact vascular plant material, which can represent up to 80% of the C in soil A horizons).…”

Section: Tools To Study Sommentioning

confidence: 99%

Potential responses of soil organic carbon to global environmental change

Trumbore

1997

Proc. Natl. Acad. Sci. U.S.A.

387

255

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Recent improvements in our understanding of the dynamics of soil carbon have shown that 20-40% of the approximately 1,500 Pg of C stored as organic matter in the upper meter of soils has turnover times of centuries or less. This fast-cycling organic matter is largely comprised of undecomposed plant material and hydrolyzable components associated with mineral surfaces. Turnover times of fastcycling carbon vary with climate and vegetation, and range from <20 years at low latitudes to >60 years at high latitudes. The amount and turnover time of C in passive soil carbon pools (organic matter strongly stabilized on mineral surfaces with turnover times of millennia and longer) depend on factors like soil maturity and mineralogy, which, in turn, ref lect long-term climate conditions. Transient sources or sinks in terrestrial carbon pools result from the time lag between photosynthetic uptake of CO 2 by plants and the subsequent return of C to the atmosphere through plant, heterotrophic, and microbial respiration. Differential responses of primary production and respiration to climate change or ecosystem fertilization have the potential to cause significant interrannual to decadal imbalances in terrestrial C storage and release. Rates of carbon storage and release in recently disturbed ecosystems can be much larger than rates in more mature ecosystems. Changes in disturbance frequency and regime resulting from future climate change may be more important than equilibrium responses in determining the carbon balance of terrestrial ecosystems.

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