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Root Length in Young Hybrid Populus Plantations: Its Implication for Border Width of Research Plots

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Root length may be important in determining research plot border width. Measurements of hand excavated hybrid Populus roots showed root length increased with tree age up to at least 3 years. Maximum root length ranged from 2.2 m for 1-year-old trees to 5.2 m for 3-year-old trees. It appears that in some studies, e.g., irrigation and fertilization treatments, border width may be considerable and probably increases with tree age. Border width sufficient to avoid edge effects from a plot that had an irrigation and fertilization treatment applied to it was at least 2-3 m. Total tree height decreased significantly toward the plot edge across a 6 m wide untreated border zone. Published data from spacing and yield studies shows tree biomass increases toward the edge of plots, probably as a response to light. This study showed that height and diameter decreased toward the plot edge when an irrigation and fertilization treatment was applied to the plot. These contrasting results in edge effect are discussed in terms of canopy vs. root competition. Some possible effects of different experimental treatments on the necessary plot border width are explored. Forest Sci. 27:808-814.
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Keywords: Research plot size; experimental design; isolation strips; plot border effects

Document Type: Journal Article

Affiliations: Principal Hydrologist, USDA Forest Service, North Central Forest Experiment Station, Forestry Sciences Laboratory, P.O. Box 898, Rhinelander, WI 54501

Publication date: 1981-12-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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