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Biomass and Nutrient Content of Quaking Aspen at two Sites in the Western United States

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Twenty aspen trees from three different clones in two areas (Wyoming and Utah) were measured for aboveground biomass and nutrients. Trees varied in age from 16 to 91 years for the Utah clones and from 94 to 151 years for the Wyoming clone. Branches, bark, and bole accounted for between 85 and 90 percent of the total-tree biomass. Current growth (leaves and current twigs) accounted for approximately 3.6 percent of the total weight. Total biomass for the three clones ranged between 6 and 9 kg/m². Exponential curves having R² values of 0.997 were developed to represent total-tree bio-mass as a function of dbh for the two areas. Similar curves having R² values from 0.368 to 0.992, were developed for each of the seven component parts of the tree. Samples from component parts of the trees were analyzed for nitrogen, phosphorus, potassium, calcium, sodium, magnesium, zinc, iron, and percent ash. Highest concentrations of most nutrients were found in leaves and new twigs, but most of the nutrient pool was contained in the bark and bole. Forest Sci. 24:273-280.

Keywords: Chemical composition (vegetation); Populus tremuloides

Document Type: Journal Article

Affiliations: Research Hydrologist, Intermountain Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Ogden, Utah 84401

Publication date: June 1, 1978

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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