Ecological Archives E086-093-A6

Vernon S. Peters, S. Ellen Macdonald, and Mark R. T. Dale. 2005. The interaction between masting and fire is key to white spruce regeneration. Ecology 86:1744–1750.

Appendix F (Table F1). A table presenting age underestimation in white spruce between ground-level ring counts and crossdating at the root collar.

Fire Stand age
(years)
No. of trees No. of stands Mean error
(years)
Range of underestimation
(years)
1982 House River 16 40 3 2.8 07
1982 Rock Island 16 58 4 2.6 06
1981 B 18 51 4 2.5 010
1980 Winefred Lake 19 54 3 2.6 09
1980 Conklin Trail 19 54 3 3.1 08
1979 Winefred Lake 20 29 1 2.4 06
1961 House River 38 55 2 6.4 116
1958 Lawrence Lake 41 55 2 4.4 016
1941 Piche Lake 59 28 1 5.6 015
1941 Conklin Trail 59 28 1 7.1 127
1942 Logan Lake 58 30 1 5.4 112
1942 Wabasca Lake 58 29 1 5.9 117

   Notes: Additional steps are necessary to obtain accurate ages with older spruce (Peters et al. 2002); consequently, below-ground crossdating was conducted on stands between 16 to 20 years old at the time of sampling, and the additional step of crossdating trees above ground was conducted on older stands. Trees from the fires that occurred in 1991 to 1994, and the 1981 Mariana Lake Fire were not crossdated and are therefore omitted from this table. Age underestimation is conservative for the 1941, 1942, and 1961 fires because many of the most suppressed trees could not be crossdated with the master chronology. Underestimation is even more conservative for the 1958 fire because trees were not crossdated above ground. The mean aging error appears to plateau in stands originating before 1961; however, the older fires also contained a large percentage of trees that established 30–40 years after fire, which have smaller errors than older trees and reduce the overall mean error. The 1961 and 1979 data were published in Peters et al. (2002).

 

LITERATURE CITED

Peters, V. S., S. E. Macdonald, and M. R. T. Dale. 2002. Aging discrepancies of white spruce affect the interpretation of static age structure in boreal mixedwoods. Canadian Journal of Forest Research 32:1496–1501.



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