Growth models for ponderosa pine

Growth models for ponderosa pine
Author: William W. Oliver
Publisher:
Total Pages: 28
Release: 1978
Genre: Ponderosa pine
ISBN:
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Yields for high-survival, unthinned ponderosa pine (Pinus ponderosa Laws.) plantations in northern California are estimated. Stems of 367 trees in 12 plantations were analyzed to produce a growth model simulating stand yields. Diameter, basal area, and net cubic volume yields by Site Indices, 40 through 120 are tabulated for stands ranging in age between 10 and 50 years and in spacing between 6 by 6 and 12 by 12 feet. Tables also show diameter distributions by crown classes and stem volumes in cubic feet for plantation-grown ponderosa pine. These data provide both a standard with which to compare the effects of management decisions, and a performance goal.

Growth Intercept, Years-to-breast-height, and Juvenile Height Growth Models for Ponderosa Pine

Growth Intercept, Years-to-breast-height, and Juvenile Height Growth Models for Ponderosa Pine
Author: Gordon Donald Nigh
Publisher:
Total Pages: 16
Release: 2002
Genre: Nature
ISBN:
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This report describes features of three models developed for estimating site index & height growth of ponderosa pine. The models are based on data from 80 ponderosa pine stem analysis plots established throughout the range of this species in British Columbia. The first model is used to calculate the number of years that a tree takes to reach breast height. The second model calculates the average annual height growth, adjusted for age. The final model is for calculating juvenile height.

Prediction of Height Increment for Models of Forest Growth

Prediction of Height Increment for Models of Forest Growth
Author: Albert R. Stage
Publisher:
Total Pages: 32
Release: 1975
Genre: Afforestation
ISBN:
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Functional forms of equations were derived for predicting 10-year periodic height increment of forest trees from height, diameter, diameter increment, and habitat type. Crown ratio was considered as an additional variable for prediction, but its contribution was negligible. Coefficients of the function were estimated for 10 species of trees growing in 10 habitat types of northern Idaho and northwestern Montana.

Growth of Planted Ponderosa Pine Thinned to Different Stocking Levels in Northern California

Growth of Planted Ponderosa Pine Thinned to Different Stocking Levels in Northern California
Author: William W. Oliver
Publisher:
Total Pages: 20
Release: 1979
Genre: Forest management
ISBN:
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Growth was strongly related to growing stock level (GSL) for 5 years after thinning 20-year-old poles on Site Index50 115 land at the Elliot Ranch Plantation in northern California. Five GSL's- basal areas anticipated when trees average 10 inches d. b. h. or more - ranging from 40 to 160 square feet per acre were tested. Periodic annual increment (PAI) in diameter decreased curvilinearly from 0.51 to 0.21 inch, with increasing GSL's from 40 to 160. But only trees in plots heavily thinned to GSL 40 (and briefly in GSL 70) grew faster in diameter after thinning than these same trees grew before thinning. PAI in basal area and net volume rose steadily with increasing GSL9s, reaching 9.0 square feet and 255 cubic feet per acre, respectively, at GSL 160. Apparently, even light thinning reduced volume production, but thinning still is recommended to shorten time until first commercial entry and to promote stand health.