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Dynamics and Simulated Yieldof Douglas-fir

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Detailed examination of the growth of stems and branches of second-growth Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, covering a range of heights and densities on highly productive sites near Lake Cowichan, British Columbia, led to the development of equations and numeric techniques that describe the relations depicted as follows: age, site quality and tree vigor —» height growth —» branch extension —» size and shape of the crown —» foliar volume —> quantity and distribution of annual bole increment, and subsequent height growth. These and other relations are incorporated into a dynamic mathematical model that allows the simulated crowns of individual trees to expand and contract asymmetrically in a three-dimensional growing space in response to internal growth processes and the physical restrictions imposed by competitors. The crowns add a shell of foliage each year that benefits the tree in diminishing amounts for 5 years. The volume increment produced by the 1- to 5-year-old foliage is distributed over the bole annually and accumulated to provide tree and stand statistics. Close correspondence between simulated data and 18 years of growth records from 16 thinning plots in 31-year-old plantations validate the model. Potential applications discussed include yield responses to fertilization, thinning, defoliation, and genetic improvement.

Keywords: Pseudotsuga menziesii; branch growth; crown expansion

Document Type: Journal Article

Affiliations: Canadian Forestry Service, Pacific Forest Research Centre, Victoria, B.C., and the School of Forestry andEnvironmental Studies, Yale Univ., New Haven, Forest Science Monograph 17CT 06511

Publication date: December 1, 1975

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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