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Post-harvest Regeneration of Lowland Black Spruce Forests in Northeastern Ontario

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Abstract

Success of natural regeneration has been a concern since the introduction of heavy machinery in harvesting. The objective was to compare the effect of three operational harvest methods careful logging around advanced growth (CLAAG), group seed tree (GST), and group seed tree followed by shearblading site preparation (SHE) on natural regeneration in the Clay Belt region of Ontario. A total of 30 stands, 562 cluster sample plots, were surveyed. Total density of black spruce regeneration did not differ, but height structure of black spruce regeneration did among harvest methods. The CLAAG method resulted in highest total regeneration density of other conifers. Decreasing density of other conifers from the CLAAG to GST to SHE sites indicated that the CLAAG method protected advance regeneration as expected and the SHE method removed advance regeneration in the path of the shearing blade. Both black spruce and other conifer regeneration densities increased with increasing time since harvest. Stocking of black spruce, all conifers, or all tree species did not differ significantly among harvest methods, nor did it change with time since harvest. Stocking was nonlinearly related to regeneration density. Models developed in this study predict that full stocking (i.e., 60%) can be reached based on regeneration density of 5000 stems per ha regardless of crop species choice preference. However, the existing stocking criterion for assessing black spruce regeneration may be problematic.

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Authors and Affiliations

  1. Faculty of Forestry and the Forest Environment, Lakehead University, 955 Oliver Road, Thunder Bay, P7B 5E1, ON

    Han Y. H. Chen & Jian R. Wang

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  1. Han Y. H. Chen
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  2. Jian R. Wang
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Correspondence to Han Y. H. Chen.

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Chen, H.Y.H., Wang, J.R. Post-harvest Regeneration of Lowland Black Spruce Forests in Northeastern Ontario. New Forest 31, 115–129 (2006). https://doi.org/10.1007/s11056-004-4764-6

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  • DOI: https://doi.org/10.1007/s11056-004-4764-6

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