Long-term trends in dominant-height growth of black pine using dynamic models
Black pine (Pinus nigra Arn.) is a pan-Mediterranean species of high ecological importance and one of the most important timber species in the area. We compare several site dependent height-age models for the species in three regions along its natural distribution area in Spain. The best model was a generalized algebraic difference approach (GADA) polymorphic model with variable asymptotes (Cieszewski, C.J.;Bailey, R.L.;2000. Generalized algebraic difference approach theory based derivation of dynamic site equations with polymorphism and variable asymptotes. For. Sci. 46, 116-126). There was no significant increase in error when a reduced model common to the three regions was tested instead of a full model with region-specific parameters. To study possible biases of the proposed model along the trees' lifespan we carried out a LOWESS analysis of residuals in time. We detected deviations in the model residuals, and a patent growth reduction in the 1960s and 1970s, which might be related to climate and/or changing stand characteristics. Departures from estimated mean past growth should be monitored in the future to adapt models to a changing environment. © 2008 Elsevier B.V. All rights reserved.
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | artículo biblioteca |
| Language: | English |
| Published: |
Elsevier
2008
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| Subjects: | Pinus nigra, Permanent sample plots, Generalized algebraic difference approach, Site index, Height growth trends, Mediterranean, |
| Online Access: | http://hdl.handle.net/10261/293034 |
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| Summary: | Black pine (Pinus nigra Arn.) is a pan-Mediterranean species of high ecological importance and one of the most important timber species in the area. We compare several site dependent height-age models for the species in three regions along its natural distribution area in Spain. The best model was a generalized algebraic difference approach (GADA) polymorphic model with variable asymptotes (Cieszewski, C.J.;Bailey, R.L.;2000. Generalized algebraic difference approach theory based derivation of dynamic site equations with polymorphism and variable asymptotes. For. Sci. 46, 116-126). There was no significant increase in error when a reduced model common to the three regions was tested instead of a full model with region-specific parameters. To study possible biases of the proposed model along the trees' lifespan we carried out a LOWESS analysis of residuals in time. We detected deviations in the model residuals, and a patent growth reduction in the 1960s and 1970s, which might be related to climate and/or changing stand characteristics. Departures from estimated mean past growth should be monitored in the future to adapt models to a changing environment. © 2008 Elsevier B.V. All rights reserved. |
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