Even-aged or uneven-aged modelling approach? A case for Pinus brutia

de-Miguel, Sergio; Pukkala, Timo; Assaf, Nabil; Bonet, J. A.

doi:10.1007/s13595-011-0171-2

Cited by 16 publications

(17 citation statements)

References 15 publications

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“…The models presented in this study may be regarded to represent the uneven-aged modeling approach (Vanclay, 1994;de-Miguel, Pukkala, Assaf, & Bonet, 2012). This is because the model set includes ingrowth models, and stand age and dominant height are not used as predictors.…”

Section: Discussionmentioning

confidence: 99%

“…Technically, models for uneven-aged forests can be used also for even-aged forest, but models for even-aged forests cannot always be used for uneven-aged forests. Although the models for even-aged stands often use important predictors that cannot be used in the uneven-aged approach, particularly stand age and dominant height, the uneven-aged modeling approach may still be fairly competitive also in even-aged forests (de-Miguel et al, 2012). Most probably the even-aged modeling approach is superior in strictly even-aged pure stands (de-Miguel et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

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Species Interactions in the Dynamics of Even- and Uneven-Aged Boreal Forests

Pukkala

Lähde²,

Laiho³

2013

Journal of Sustainable Forestry

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107

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Many boreal tree stands are neither clearly even-aged nor clearly uneven-aged. The stands may undergo a series of stages, during which an even-aged stand is transformed into two-storied mixed stand, and finally to multistoried or uneven-aged stand structure. The species composition often changes during the succession of stand stages. This study developed models for stand dynamics that can be used in different stand structures and species compositions. The model set consists of species-specific individual-tree diameter increment and survival models, and models for ingrowth. Separate models were developed for Scots pine, Norway spruce, and hardwood species. The models were used in a growth simulator, to give illustrative examples on species influences and stand dynamics. Methods to simulate residual variation around diameter increment and ingrowth models are also presented. The results suggest that mixed stands are more productive than one-species stands. Spruce in particular benefits from an admixture of other species. Mixed species improve diameter increment, decrease mortality, and increase ingrowth. Pine is a more beneficial admixture than birch. Simulations showed that uneven-aged management of spruce forests is sustainable and productive, and even-aged conifer stands growing on medium sites can be converted into uneven-aged mixed stands by a series of strong high thinnings.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Species Interactions in the Dynamics of Even- and Uneven-Aged Boreal Forests

Pukkala

Lähde²,

Laiho³

2013

Journal of Sustainable Forestry

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107

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“…Such a calculation was done for a forest containing three age classes of even-aged stands and for a forest having a similar uneven-aged structure everywhere. The basal areas of the stands used in the calculation were typical values for Syrian and Lebanese P. brutia forests (Shater et al 2011;de-Miguel et al 2012b). The proportions of biomass components in the even-aged and uneven-aged forests reflected the proportions found at tree level.…”

Section: Forest-level Biomass Predictionsmentioning

confidence: 99%

“…As a consequence of this, pine stands in Syria are more dense and even-aged, whereas the Lebanese stands present different degrees of "uneven agedness" resulting in higher within-stand heterogeneity in terms of tree size and shape (de-Miguel et al 2010(de-Miguel et al , 2012b. The determination of differences in stand structure based on statistical criteria such as standard deviation and skewness (Fig.…”

Section: Biomass Componentsmentioning

confidence: 99%

“…brutia forests occurring in Syria and Lebanon constitute two non-connected populations that have been subjected to different past forest management regimes according to different forest policies, which in turn have shaped the forest stand structures ranging from mostly unthinned even-aged stands in Syria to more sparse multilayered and uneven-aged stand structures in Lebanon ( Fig. 1) (de-Miguel et al 2010(de-Miguel et al , 2012b. Since cutting of living trees is strictly forbidden in Syria, most Syrian stands are on the self-thinning limit.…”

Section: Introductionmentioning

confidence: 99%

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Intra-specific differences in allometric equations for aboveground biomass of eastern Mediterranean Pinus brutia

de-Miguel

Pukkala

Assaf³

et al. 2013

Annals of Forest Science

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& Context Biomass prediction is important when dealing for instance with carbon sequestration, wildfire modeling, or bioenergy supply. Although allometric models based on destructive sampling provide accurate estimates, alternative speciesspecific equations often yield considerably different biomass predictions. An important source of intra-specific variability remains unexplained.• Aims The aims of the study were to inspect and assess intraspecific differences in aboveground biomass of Pinus brutia Ten. and to fill the gap in knowledge on biomass prediction for this species.• Methods Two hundred one trees between 2.3 and 55.8 cm in diameter at breast height were sampled throughout the easternand southernmost natural distribution area of P. brutia, in Middle East, where it forms different stand structures.Allometric equations were fitted separately for two countries. The differences in biomass prediction at tree, stand, and forest level were analyzed. The effect of stand structure and past forest management was discussed.• Results Between-country differences in total aboveground biomass were not large. However, differences in biomass stock were large when tree components were analyzed separately. Trees had higher stem biomass and lower crown biomass in dense even-aged stands than in more uneven-aged and sparse stands.• Conclusion Biomass and carbon predictions could be improved by taking into account stand structure in biomass models.

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