Simulating the extent of decay caused by Heterobasidion annosum s. l. in stems of Norway spruce

Seifert, Thomas

doi:10.1016/j.foreco.2007.02.036

Cited by 27 publications

(19 citation statements)

References 23 publications

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“…the REMO scenarios with a spatial scale of 10 km; Jacob et al 2001) improve the simulations of the impacts of climate changes on growth. Extreme climate situations (drought events or storm disasters) and/or secondary stress effects like diseases and pests must be regarded as well (Seifert 2007). Allocation patterns of trees may additionally vary consistantly between years because of alternating cone and fruit production (Seifert and Müller-Starck 2008).…”

Section: Discussionmentioning

confidence: 99%

Modelling above and below ground carbon dynamics in a mixed beech and spruce stand influenced by climate

2008

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Tree growth and carbon dynamics are important issues especially in the context of climate change. However, we essentially lack knowledge about the effects on carbon dynamics especially in mixed stands. Thus, the objective of this study was to test the effects of climatic changes on the above and below ground carbon dynamics of a mixed stand of Norway spruce (Picea abies [L.] Karst.) and European beech (Fagus sylvatica L.) by means of scenario simulations. To account for the typical tree interactions in a mixed-species stand a spatial explicit tree growth model based on eco-physiological processes was applied. Three different climate scenarios considering altered precipitation, temperature, and radiation were calculated for an unthinned and a thinned stand. The results showed significant changes of above and belowground biomass over time, especially when temperature and radiation were increased additionally to decreased precipitation. The reduction in biomass increments of Norway spruce were more attenuated above than below ground. In contrast, the results for beech were the opposite: The belowground increments were reduced more. These results suggest a shift in the species contribution to above and belowground biomass under dryer and warmer conditions. Distinct effects were also found when thinned and unthinned stands were compared. A reduced stand density changed the proportions of above and below ground carbon allocation. As a main reason for the changed growth reactions the water balance of trees was identified which lead to changed biomass allocation pattern.

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Section: Discussionmentioning

confidence: 99%

Modelling above and below ground carbon dynamics in a mixed beech and spruce stand influenced by climate

2008

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“…typically bottle-shaped stem base or sporocarps at the basis of the trunk; Puddu et al 2003) were selected from the interior of each study stand as sample trees. Attention was drawn to H. annosum as this pathogen is known to reduce the stem diameter growth with increasing age of infected trees (Bendz-Hellgren and Stenlid 1995;Seifert 2007). The sampled trees had live crown ratios (i.e.…”

Section: Study Sitesmentioning

confidence: 99%

Combining tree-ring analyses on stems and coarse roots to study the growth dynamics of forest trees: a case study on Norway spruce (Picea abies [L.] H. Karst)

Nikolova

Zang

Pretzsch

2011

Trees

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We show the potential of a new method combining tree-ring analyses on stems and on coarse roots of individual trees in order to advance the understanding of growth dynamics in forest trees. To this end, we studied the root-shoot allometry of trees and its dependence on site conditions. Along a gradient in water supply in Southern Germany from dry to moist sites we selected 43 Norway spruce trees (Picea abies [L.] H. Karst.) aged 65-100 years. Increment cores were taken from stem and main roots revealing aboveground and belowground growth course over the last 34 years. Annual growth rates in roots and stems and their allometric relationships were applied as surrogate variables for tree resource allocation to aboveground and belowground organs. The mean sensitivities of both stem and root chronologies were found to be sitespecific, and increased from the moist through the dry sites. No temporal offset between aboveground and belowground growth reactions to climate conditions was found in Norway spruce at any of the sites. These results suggest that the root-shoot allometry depends on the specific site conditions only at the driest site, following the optimal biomass partitioning theory (the more restricted the water supply, the more organic matter allocation into the belowground organs).

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“…As explained in the provincial scaling instructions (Ministère des Ressources naturelles, 2001), the rotten zone was visually evaluated and defined as severely degraded wood where the fibre structure has softened or is totally disintegrated, and which cannot be used in any wood products. The definition used in this study corresponds to levels III and IV defined by Zycha (1962) and used by Seifert (2007 the diameter of a circle having the same area as that of the observed decay area. Total height was also measured.…”

Section: Databasementioning

confidence: 99%

Predicting decay and round-wood end use volume in trembling aspen (Populus tremuloides Michx.)

et al. 2008

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-• In Quebec (Canada), predicting net merchantable volume of standing trees is essential to adjust stumpage fees. Furthermore, round-wood end use is important in the provincial forest management context because it is used to split the allowable annual cut among the different mill types.• A method relying on linear, binomial and cumulative logit regressions is proposed to predict both decay volume and round-wood end use volume. Tree age, height and quality, as well as ecological region, stand origin and presence of Phellinus tremulae (Bond.) Bond. & Boriss. and Ceratocystis fimbriata (Ellis & Halst.) fungi are the main factors that contribute to the presence and the proportion of decayed merchantable volume. Once the net merchantable volume is estimated, its division into round-wood end use is estimated through a series of steps involving the presence of Phellinus tremulae, saw log height, stem quality and size as explanatory variables. The first step is a multinomial regression which predicts the number of end uses (pulp wood, low-grade saw logs, saw logs, low-grade veneer, and veneer) that are present in the stem. A series of logistic regressions then determines the presence of each end use, with linear regressions predicting the round-wood volume of each end use.forest products / forest management / decay / modelling / trembling aspen Résumé -Prévision du volume de bois carié et de la répartition par produits chez le peuplier faux-tremble (Populus tremuloides Michx.).• Au Québec (Canada), la prévision du volume marchand net des arbres sur pied est indispensable pour déterminer les droits de coupe. En outre, la répartition par produits du volume marchand net est essentielle dans le contexte de la gestion forestière régionale car c'est cette étape qui détermine la portion de la possibilité forestière qui est attribuée aux différentes usines de transformation.• Une méthode utilisant des régressions linéaires, binomiales et logistiques cumulatives est proposée pour prédire à la fois le volume de carie et sa répartition par produits. L'âge de l'arbre, la hauteur et la qualité, comme la région écologique, l'origine du peuplement et la présence de champignons Phellinus tremulae (Bond.) Bond. & Boriss. et Ceratocystis fimbriata (Ellis & Halst.) sont les principaux facteurs qui contribuent à la présence et à la proportion du volume de bois carié. Une fois le volume marchand net estimé, sa répartition par produits est estimée à travers une série d'étapes impliquant la présence de Phellinus tremulae, la hauteur de bois d'oeuvre, la qualité et la taille des tiges comme variables explicatives. La première étape est une régression logistique cumulative qui prédit le nombre d'utilisations finales (bois de pâte, sciage de basse qualité, bille de sciage, placage de basse qualité et placage) qui sont présentes dans le tronc. Une série de régressions logistiques détermine alors la présence de chacune de ces utilisations. Enfin, des régressions linéaires prédisent le volume marchand net de chaque utilisation. produits fo...

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Simulating the extent of decay caused by Heterobasidion annosum s. l. in stems of Norway spruce

Cited by 27 publications

References 23 publications

Modelling above and below ground carbon dynamics in a mixed beech and spruce stand influenced by climate

Modelling above and below ground carbon dynamics in a mixed beech and spruce stand influenced by climate

Combining tree-ring analyses on stems and coarse roots to study the growth dynamics of forest trees: a case study on Norway spruce (Picea abies [L.] H. Karst)

Predicting decay and round-wood end use volume in trembling aspen (Populus tremuloides Michx.)

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