Fixed versus variable-parameter matrix models of forest growth: thecase of maple-birch forests
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| Title: | Fixed versus variable-parameter matrix models of forest growth: thecase of maple-birch forests |
|---|---|
| Authors: | Buongiorno, J., Lin, C.-R. |
| Source: | Ecological Modelling. 6/30/1997, Vol. 99 Issue 2/3, p263. 0p. |
| Subjects: | Forest management, Modeling (Sculpture) |
| Abstract: | A matrix growth model with constant parameters has been modified, bymaking survivor growth and mortality of trees functions of stand basal area. The functions, estimated from re-measured plots in Wisconsinmaple-birch forests, showed that basal area affected mostly the growth of small trees. However, even when the effects were statistically significant, they were small. Fifteen-year forecasts with the variable-parameter model were almost identical to those of the fixed-parameter model for a set of 37 random plots. Long-term, steady-state predictions gave similar diameter distributions for both models, but a 20% lower basal area for the variable-parameter model. Steady-state management regimes that maximized soil rent were identical for both modelsin terms of intensity of harvest and length of cutting cycle. The basal area, harvests, and net present values predicted by both models, in the long run and during conversion, were also nearly the same. Formanaged maple-birch forests, the matrix model with constant parameters has the advantage of simplicity of form, estimation, and application, especially in optimization mode. [ABSTRACT FROM AUTHOR] |
| Copyright of Ecological Modelling is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 8155317 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Fixed versus variable-parameter matrix models of forest growth: thecase of maple-birch forests – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Buongiorno%2C+J%2E%22">Buongiorno, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Lin%2C+C%2E-R%2E%22">Lin, C.-R.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Ecological+Modelling%22">Ecological Modelling</searchLink>. 6/30/1997, Vol. 99 Issue 2/3, p263. 0p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Forest+management%22">Forest management</searchLink><br /><searchLink fieldCode="DE" term="%22Modeling+%28Sculpture%29%22">Modeling (Sculpture)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A matrix growth model with constant parameters has been modified, bymaking survivor growth and mortality of trees functions of stand basal area. The functions, estimated from re-measured plots in Wisconsinmaple-birch forests, showed that basal area affected mostly the growth of small trees. However, even when the effects were statistically significant, they were small. Fifteen-year forecasts with the variable-parameter model were almost identical to those of the fixed-parameter model for a set of 37 random plots. Long-term, steady-state predictions gave similar diameter distributions for both models, but a 20% lower basal area for the variable-parameter model. Steady-state management regimes that maximized soil rent were identical for both modelsin terms of intensity of harvest and length of cutting cycle. The basal area, harvests, and net present values predicted by both models, in the long run and during conversion, were also nearly the same. Formanaged maple-birch forests, the matrix model with constant parameters has the advantage of simplicity of form, estimation, and application, especially in optimization mode. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Ecological Modelling is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 0 StartPage: 263 Subjects: – SubjectFull: Forest management Type: general – SubjectFull: Modeling (Sculpture) Type: general Titles: – TitleFull: Fixed versus variable-parameter matrix models of forest growth: thecase of maple-birch forests Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Buongiorno, J. – PersonEntity: Name: NameFull: Lin, C.-R. IsPartOfRelationships: – BibEntity: Dates: – D: 30 M: 06 Text: 6/30/1997 Type: published Y: 1997 Identifiers: – Type: issn-print Value: 03043800 Numbering: – Type: volume Value: 99 – Type: issue Value: 2/3 Titles: – TitleFull: Ecological Modelling Type: main |
| ResultId | 1 |
