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Foliar δ13C and δ15N Response of Lodgepole Pine and Douglas-Fir Seedlings to Soil Compaction and Forest Floor Removal

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The effects of soil compaction, forest floor (FF) removal, and rehabilitation treatments on foliar δ13C and δ15N of lodgepole pine (Pinus contorta) and Douglas-fir (Pseudotsuga menziesii) were studied on a calcareous soil. Regardless of soil compaction, FF removal (which reduces soil water potential) resulted in less negative foliar δ13C values of lodgepole pine (from −25.9 to −23.4‰), whereas soil compaction effects on foliar δ13C were observed only within the FF intact treatment. This result and the more negative foliar δ13C with increasing seedling growth most likely reflected limitation on CO2 diffusion due to water stress caused by those treatments. However, foliar δ13C of Douglas-fir (range −25.0 ∼ −24.5‰) were not affected by the treatments, indicating less susceptibility to water stress. Soil compaction reduced NH4 +-N concentrations in the FF (from 48.5 to 28.0) and NO3 -N concentrations in the FF (from 13.8 to 6.4) and mineral soil (from 4.3 to 2.1 mg kg−1), and FF removal tended to decrease NH4 +-N concentrations in the mineral soil. Foliar δ15N of both species were not affected by soil compaction but were increased by the FF removal and rehabilitation treatments, indicating that the latter two treatments dramatically altered soil N dynamics. FOR. SCI. 51(6):546–555.
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Keywords: C and N stable isotope compositions; Water stress; disturbance; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; long-term soil productivity (LTSP); natural resource management; natural resources; nitrogen dynamics

Document Type: Regular Article

Affiliations: 1: Assistant Professor Department of Biosystems & Agricultural Engineering and Institute of Agricultural Science & Technology Chonnam National University Gwangju Korea 500-757, Email: 2: Assistant Professor Department of Renewable Resources University of Alberta 442 Earth Sciences Building Edmonton Alberta Canada T6G 2E3 Phone: (780) 492-6375;, Fax: (780) 492-1767, Email: 3: Research Scientist Ministry of Forests, Forest Sciences Program 1907 Ridgewood Road Nelson British Columbia Canada V1L 6K1, Email: 4: Assistant Professor Department of Applied Biological and Environmental Chemistry, School of Agricultural Biotechnology Seoul National University Seoul South Korea 151-921, Email: 5: Formerly Research Associate Department of Renewable Resources University of Alberta, Edmonton 442 Earth Sciences Building Edmonton Alberta Canada T6G 2E3, Email: 6: Professor Department of Renewable Resources University of Alberta 442 Earth Sciences Building Edmonton Alberta Canada T6G 2E3, Email:

Publication date: 2005-12-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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