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A Simulation Approach for Predicting the Effect of Douglas-Fir Tussock Moth Defoliation on Juvenile Tree Growth and Stand Dynamics Item Info

A spatially dependent tree growth projection model was developed and used to simulate juvenile grand fir, Abies grandis (Dougl.) Lindl., Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, and ponderosa pine, Pinus ponderosa Laws., in northern Idaho. Simulated experiments using the model examined the effects of Douglas-fir tussock moth, Orgyia pseudotsugata McDunnough, defoliation on stand dynamics during the first 40 years of stand development. The sequence and intensity of the defoliation episodes were varied for different combinations of age, stand density, and tree species composition at the time of the first defoliation. The results are summarized in statistical models which predict the long-term effects of tussock moth defoliationon stand dynamics. Results indicate that the insect regulates primary forest production by reducing stand biomass and by redistributing growth energy from host to nonhost trees by altering intertree competitive relationships to the advantage of nonhosts.

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Title:
A Simulation Approach for Predicting the Effect of Douglas-Fir Tussock Moth Defoliation on Juvenile Tree Growth and Stand Dynamics
Creator:
Moore, J. A.; Hatch, C. R.
Date Created (ISO Standard):
1981
Description:
A spatially dependent tree growth projection model was developed and used to simulate juvenile grand fir, Abies grandis (Dougl.) Lindl., Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, and ponderosa pine, Pinus ponderosa Laws., in northern Idaho. Simulated experiments using the model examined the effects of Douglas-fir tussock moth, Orgyia pseudotsugata McDunnough, defoliation on stand dynamics during the first 40 years of stand development. The sequence and intensity of the defoliation episodes were varied for different combinations of age, stand density, and tree species composition at the time of the first defoliation. The results are summarized in statistical models which predict the long-term effects of tussock moth defoliationon stand dynamics. Results indicate that the insect regulates primary forest production by reducing stand biomass and by redistributing growth energy from host to nonhost trees by altering intertree competitive relationships to the advantage of nonhosts.
Subjects:
research (document genres)
Location:
North and Central Idaho; Eastern Washington; Western Montana; Northeastern Oregon
Publisher:
Forest Science
Source:
Moore, J.A. and C.R. Hatch. 1981. A Simulation Approach for Predicting the Effect of Douglas-Fir Tussock Moth Defoliation on Juvenile Tree Growth and Stand Dynamics. Forest Sci Vol 27, No. 4, 1981, pp. 685-700
Source Identifier:
Simulation_Approach_Predicting_the_Effect_of_DF_Tussock_Moth_Defoliation_ on_Juvenile_Trees_ ForSci_027_004_1981
Type:
Text
Format:
application/pdf

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Preferred Citation:
"A Simulation Approach for Predicting the Effect of Douglas-Fir Tussock Moth Defoliation on Juvenile Tree Growth and Stand Dynamics", Idaho Forestry Research Collection, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/forestryresearch/items/forestryresearch862.html
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Educational use includes non-commercial use of text and images in materials for teaching and research purposes. Digital reproduction rights granted by University of Idaho Library. For other uses beyond educational use, please contact University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu.
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