Modelling Stem Profiles

Brink, Christine; Gadow, Klaus von

doi:10.1080/00382167.1983.9628909

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…To enable a possible extrapolation of the model, polynomial form functions with known sturdiness or generality have been tested: Kozak's models and its derivatives [12,16], Brink's and its derivatives [7,8,24,25], and Pain's [23]. The best results have been obtained with the last four, which are all built on the same principle: the addition of two functions.…”

Section: Model Genesismentioning

confidence: 93%

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Form function for the `I-214' poplar merchantable stem (Populus � euramericana (Dode) Guinier cv cultivar `I-214')

Roda¹

2001

Ann. For. Sci.

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-This paper describes a research and application integrated procedure: the development, evaluation, and use of a form function for the 'I-214' poplar merchantable stem. Because this form function is to be used by timber merchants, a particular emphasis is placed on its sturdiness and reliability. The model is extrapolated to other poplar clones in order to measure the error when using it beyond the range of validity. The limits of the model and possibilities for its improvement are discussed. Its applications are presented.

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Section: Model Genesismentioning

confidence: 93%

“…Tables III and IV present these predictions for three assortment categories (7,20, and 30 cm top diameters). Compared volumes are observed volumes for each measurement point, and reconstituted volumes after prediction of the cross sectional area at the height of each measurement point.…”

Section: Model Extrapolationmentioning

confidence: 99%

Form function for the `I-214' poplar merchantable stem (Populus � euramericana (Dode) Guinier cv cultivar `I-214')

Roda¹

2001

Ann. For. Sci.

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“…A model, based on a first-order differential equation was presented by Brink and von Gadow (1983). In other studies again, regression equations were fitted with the true form factor as independent and the true form quotient as dependent variable (Prodan, 1944;Kajihara, 1972;Enghardt, 1971).…”

Section: Introductionmentioning

confidence: 99%

Form Quotients and Stem Form ofEucalyptus cloeziana

Laar

1985

South African Forestry Journal

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SYNOPSISThis paper deals with a stem form study in Eucalyptus cloeziana. Sample tree data obtained from the ICFR were used to obtain the diameter at different relative positions along the stem. These diameters were subsequently regressed on breast height diameter and tree height. Fourth degree polynomials are recommended to estimate the u.b. diameter at i % of the height. for trees with a given breast height diameter and total height, although linear interpolation does not induce substantial inaccuracy.Regression models are introduced with the additional dummy-variables being used to account for the effect of site. They allow the description of stem profiles for the three site categories in this study.

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Form Quotients and Stem Form of Eucalyptus grandis

Laar

Schönau

1988

South African Forestry Journal

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Modelling Stem Profiles

Cited by 4 publications

References 2 publications

Form function for the `I-214' poplar merchantable stem (Populus � euramericana (Dode) Guinier cv cultivar `I-214')

Form function for the `I-214' poplar merchantable stem (Populus � euramericana (Dode) Guinier cv cultivar `I-214')

Form Quotients and Stem Form ofEucalyptus cloeziana

Form Quotients and Stem Form of Eucalyptus grandis

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