Aspen Bibliography

Aboveground standing crop, leaf area, and calorific value in an Aspen clone near Calgary, Alberta

Document Type

Article

Journal/Book Title/Conference

Canadian Journal of Botany

Volume

48

Issue

8

First Page

1459

Last Page

1469

Publication Date

1970

Abstract

A 1967 aboveground harvest of 49 ramets of aspen (Populus tremuloides Michx.), aged from 66 to 89 years, at an altitude of 1430 m in Alberta revealed a leaf area index of 1.8 (one side of foliage) and a clone standing crop of 77.11 metric tons/hectare (oven-dry weight) with an energy equivalent of 3630 × 108 gram calories/hectare. This standing crop estimate fell within the range of 58 to 290 metric tons/hectare reported elsewhere for aspen. The amount of aspen foliage and branch wood, as a percentage of total aboveground standing crop, increased from the bottom to the top of a slope gradient within the 0.02-hectare sample plot, indicating that topographic position exerted a phenotypic expression on production structure within the clone. Topographic position did not have a significant influence on the applicability of the two most reliable independent variables ((i) diameter at breast height squared × tree height, (ii) diameter of trunk at crown base) for prediction of the total aboveground weight and component weights of aspen ramets. The allometric relations reported here are not necessarily applicable to other clones of the species but the allometric methods have potential application to other studies of the International Biological Programme.

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