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Relationships between Soil CO2 Efflux and Forest Structure in 50-Year-Old Longleaf Pine

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Interest in restoration of longleaf pine (Pinus palustris Mill.) in the southern United States offers opportunities for carbon (C) sequestration. To better understand C fluxes in longleaf pine, soil CO2 efflux (SR) and forest C pools were measured in 50-year-old stands varying in basal area from 7 to 36 m2 ha−1. Soil CO2 efflux measured monthly ranged from 1.6 to 6.4 μmol CO2 m−2 s−1 and was strongly related to soil temperature and only weakly related to basal area and forest characteristics associated with varying basal area. The annual sum of SR ranged from 11.0 to 17.9 Mg C ha−1 year−1. Litter mass explained the majority (38%) of the variation in annual SR among plots varying in basal area. Standing C stocks, which included longleaf pine aboveground and below-stump biomass, litter, soil C, live and dead fine and coarse roots (all species), down deadwood and buried coarse woody debris, ranged from 63.8 to 176.8 Mg C ha−1 . Similar SR but low longleaf pine net primary productivity in low basal area stands suggests that those stands were carbon sources; however, more information on the contribution of the herbaceous layer to ecosystem net primary productivity and SR is needed.

Keywords: Pinus palustris; basal area; carbon sequestration; soil respiration

Document Type: Research Article


Publication date: October 1, 2012

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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