LaquerreHarveyLeduc2011

Reference

Laquerre, S., Harvey, B.D. and Leduc, A. (2011) Spatial analysis of response of trembling aspen patches to clearcutting in black spruce-dominated stands. Forestry Chronicle, 87(1):77-85. (Scopus )

Abstract

While expansion of intolerant hardwoods, including trembling aspen, has been recognized as a problem by boreal forest managers in eastern Canada, the problem has mostly been associated with the boreal mixedwood and, with a few exceptions, the spatial aspects of the phenomenon have not been well documented in the scientific literature. The objective of this study is to evaluate how the density and size of aspen patches influence the change in density, size and persistence of patches following clearcutting of black spruce forests in the claybelt region of northwestern Quebec. To do this, we finely interpreted: 1) aerial photos taken between 1970 and 1979 of 12 mature black spruce-dominated stands containing varying sizes and densities of aspen patches prior to being clearcut harvested and 2) aerial photos taken between 1992 and 1995 of the 12 resulting clearcuts, 11 to 18 years after harvesting. Sketch maps of pre-and post-harvest aspen presence were rasterized and changes in aspen patch size and cover were determined. As well, the probabilities of aspen colonization with increasing distance from pre-harvest patches were calculated for each site. Black spruce forests of the claybelt containing no aspen prior to harvesting are relatively resistant to aspen invasion. However, when forests do contain aspen patches with cover values ≤25%, almost 60% of these patches increase to a higher density class. Aspen patches less than 2 ha in area had about a 50% probability of disappearing following clearcutting whereas larger patches had about a 96% chance of persisting as a result of clearcutting. In the black spruce forest of the claybelt, thick organic layers appear to have a negative effect on aspen recruitment. Distances of regenerating aspen from pre-harvest patches suggest that recruitment from seed is more important than previously thought.

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@ARTICLE { LaquerreHarveyLeduc2011,
    AUTHOR = { Laquerre, S. and Harvey, B.D. and Leduc, A. },
    TITLE = { Spatial analysis of response of trembling aspen patches to clearcutting in black spruce-dominated stands },
    JOURNAL = { Forestry Chronicle },
    YEAR = { 2011 },
    VOLUME = { 87 },
    PAGES = { 77-85 },
    NUMBER = { 1 },
    ABSTRACT = { While expansion of intolerant hardwoods, including trembling aspen, has been recognized as a problem by boreal forest managers in eastern Canada, the problem has mostly been associated with the boreal mixedwood and, with a few exceptions, the spatial aspects of the phenomenon have not been well documented in the scientific literature. The objective of this study is to evaluate how the density and size of aspen patches influence the change in density, size and persistence of patches following clearcutting of black spruce forests in the claybelt region of northwestern Quebec. To do this, we finely interpreted: 1) aerial photos taken between 1970 and 1979 of 12 mature black spruce-dominated stands containing varying sizes and densities of aspen patches prior to being clearcut harvested and 2) aerial photos taken between 1992 and 1995 of the 12 resulting clearcuts, 11 to 18 years after harvesting. Sketch maps of pre-and post-harvest aspen presence were rasterized and changes in aspen patch size and cover were determined. As well, the probabilities of aspen colonization with increasing distance from pre-harvest patches were calculated for each site. Black spruce forests of the claybelt containing no aspen prior to harvesting are relatively resistant to aspen invasion. However, when forests do contain aspen patches with cover values ≤25%, almost 60% of these patches increase to a higher density class. Aspen patches less than 2 ha in area had about a 50% probability of disappearing following clearcutting whereas larger patches had about a 96% chance of persisting as a result of clearcutting. In the black spruce forest of the claybelt, thick organic layers appear to have a negative effect on aspen recruitment. Distances of regenerating aspen from pre-harvest patches suggest that recruitment from seed is more important than previously thought. },
    COMMENT = { Export Date: 4 March 2011 Source: Scopus CODEN: FRCRA },
    ISSN = { 00157546 (ISSN) },
    KEYWORDS = { Aerial photography, Black spruce, Claybelt, Clearcutting, Encroachment, Trembling aspen },
    OWNER = { Luc },
    TIMESTAMP = { 2011.03.04 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-79951718518&partnerID=40&md5=f1a2b71d916e2c0536eb65732ae4d28f },
}

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