Abstract
Delineation of trembling aspen (Populustremuloides Michx.) clones in a 40-year-old aspen stand at Riding Mountain National Park (RMNP) and a 25- to 50-year-old aspen stand at Agassiz Forest Reserve (AFR), Manitoba, has shown that at RMNP clone size averages 0.20 acre (0.08 ha) and at AFR 0.015 acre (0.006 ha). Largest clone mapped at RMNP was 3.80 acres (1.54 ha) and at AFR 1.24 acres (0.5 ha). Although soils are heavier and the amount of ground vegetation is greater at RMNP, the clone size of the respective areas appears unrelated to present site factors.Interclonal variation in growth characteristics makes necessary the sampling of several clones when undertaking inventory and site productivity studies. In stands such as in RMNP where relatively large clones are found it is recommended that either transect plots or a larger than normal number of conventional plots are used to ensure that the required number of clones is sampled. In stands similar to those at AFR where clone size is small no special sampling modifications are required.
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