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    Author(s): Jennifer L. Parker; Ivan J. Fernandez; Lindsey E. Rustad; Stephen A. Norton
    Date: 2001
    Source: Soil Science Society of America Journal
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: Download Publication  (88.0 KB)


    Northern forest soils represent large reservoirs of C and N that may be altered by ecosystem perturbations. Soils at three paired watershed in Maine were investigated as case studies of experimentally elevated N deposition, wildfire, and whole-tree harvesting. Eight years of experimental (NH4)2SO4 additions at the Bear Brook Watershed in Maine significantly reduced forest-floor C/N ratios from 30.6 to 23.4. Forest-floor C and N pools were lower in the treated watershed (38 Mg C ha-1, 1612 kg N ha-1) compared with the reference (75 Mg C ha-1, 2372 kg N ha-1). Fifty years after wildfire at Acadia National Park, the burned watershed with hardwood regeneration had significantly lower forest-floor C and N concentrations (208 g C kg-1 soil, 9.9 g N kg-1 soil) than the reference watershed dominated by a softwoods (437 g C kg-1 soil, 12.8 g N kg-1 soil). Forest-floor C and N pools were lower in the burned watershed (27 Mg C ha-1, 1323 kg N ha-1) compared with the reference (71 Mg C ha-1, 2088 kg N ha-1). At the Weymouth Point, the harvested watershed regenerated to spruce-fir, the dominant stand type that existed before the harvest, and it had significantly lower forest-floor C concentrations and pools (406 g C kg-1 soil, 24 Mg C ha-1) than the reference (442 g C kg-1 soil, 39 Mg C ha-1) after 17 yr. All perturbations studied were associ- ated with lower forest-floor C pools.

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    Parker, Jennifer L.; Fernandez, Ivan J.; Rustad, Lindsey E.; Norton, Stephen A. 2001. Effects of Nitrogen Enrichment, Wildfire, and Harvesting on Forest-Soil Carbon and Nitrogen. Soil Science Society of America Journal. 65(4): 1248-1255.


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