Natural abundance measurements of 13C indicate increased deep soil carbon mineralization after forest disturbance

Details Natural abundance measurements of 13C indicate increased deep soil carbon mineralization after forest disturbance Natural abundance measurements of 13C indicate increased deep soil carbon mineralization after forest disturbance

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3514402d&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 14, CiteID L14402

Physics

4

Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Carbon Cycling (4806), Biogeosciences: Ecosystems, Structure And Dynamics (4815), Biogeosciences: Soils/Pedology (1865)

Scientific paper

Northern forest soils represent globally important stores of carbon (C), yet there is no consensus about how they are altered by the widespread practice of harvesting that dominates many forested landscapes. Here we present the first study to systematically investigate the utility of δ 13C and C content depth profiles to infer temporal changes in belowground carbon cycling processes following disturbance in a pure C3 ecosystem. We document carbon concentration and δ 13C depth profile enrichment trends consistent with a kinetic fractionation arising from soil organic carbon (SOC) humification across a northern forest chronosequence (1, 15, 45, 80 and 125+ yrs). Reduced soil C storage that coincided with observed soil profile δ 13C-enrichment patterns which intensified following clearcut harvesting, pointed to losses of SOC in the deeper (>20 cm) mineral soil. This study suggests the δ 13C approach may assist in identifying mechanisms responsible for soil C storage changes in disturbed C3 forest ecosystems.

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