Graduate Thesis Or Dissertation
 

Computer simulation of Douglas-fir tree and stand growth

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1j92gc51h

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  • A mathematical model has been developed to describe the growth of individual Douglas-fir trees under a variety of stand conditions and management schedules. The model was developed using empirical data from open-grown trees and reducing growth capacities of height, stem, and crown as functions of intertree competition indices. Any initial pattern of spacing for up to 30 trees may be assumed. The user must supply the stem coordinates, estimate of site, and estimate of the number of years to reach a height of 4. 5 feet for each tree. Any intensity of thinning schedule may be requested up to an annual basis. The model simulates the form of the entire bole and crown for up to 80 years of growth. All calculations were performed on a CDC 3300 electronic computer. Individual tree and stand summaries can be listed for any periodic interval of interest:. A Cal-Comp plotter output is available for a complete stem analysis, output for one specified tree in the stand. All coefficients for regressions fitted in the model are listed in a separate file for easy access and modification. The mathematical model developed here satisfactorily describes the growth of Douglas-fir stands on an individual tree basis for a wide range of stand conditions and management schedules. It was tested against seven permanent field plots for a range of conditions in both Oregon and Washington. Although predictions were not accurate there are no gross errors and the results demonstrate the sensitivity and stability of the model. The model developed here can be a valuable tool to the forester in training students, analyzing basic growth relationships, testing management schedules, evaluating fertilization and irrigation responses, and planning allowable cuts, sustained yields, and economic returns of forest products.
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file details Arney_James_1972.pdf 2017-10-24 Público Descargar