Branch-stem relationship steadiness in high-grown Norway spruce (Picea abies (L.) Karst.). ; Stabilité des relations branche-tige chez l’épicéa commun en régime de futaie régulière ; Branch-stem relationship steadiness in high-grown Norway spruce (Picea abies (L.) Karst.).: Consequences on the modeling of the branching parameters bearing on wood quality. ; Stabilité des relations branche-tige chez l’épicéa commun en régime de futaie régulière: Conséquences sur la modélisation des caractères de la branchaison intéressant la qualité du bois.
We modelled Norway Spruce branchiness, in order to estimate wood quality of standing trees grown in monospecific even-aged stands from inventory data. We studied the whorl branches of the preformed growth unit. Their number, basal diameter and insertion angle were estimated. For delimiting crown base, we modelled heights to the first green branch, first green whorl and first dead branch. We started from a model previously established from young trees data representing the average fertility classes found in Vosges mountains. In this model, the averages of branch basal diameter and insertion ang... Mehr ...
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Dokumenttyp: | doctoralThesis |
Erscheinungsdatum: | 2007 |
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HAL CCSD
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Schlagwörter: | Branch / Branch diameter / Insertion angle / Crown base / Knottiness / Fertility / Branch number / Whorl / Breast height diameter / Belgium / Sweden / Total height / Norway spruce / high grown trees / base du houppier / nodosité / nombre de branches / angle d’insertion / diamètre / branche / verticille / diamètre à 1 / 30m / fertilité / âge / Hauteur totale / France / Belgique / Suède / futaie / Epicéa commun / [SDV.SA.SF]Life Sciences [q-bio]/Agricultural sciences/Silviculture / forestry |
Sprache: | Französisch |
Permalink: | https://search.fid-benelux.de/Record/base-26968038 |
Datenquelle: | BASE; Originalkatalog |
Powered By: | BASE |
Link(s) : | https://pastel.archives-ouvertes.fr/tel-01136332 |
We modelled Norway Spruce branchiness, in order to estimate wood quality of standing trees grown in monospecific even-aged stands from inventory data. We studied the whorl branches of the preformed growth unit. Their number, basal diameter and insertion angle were estimated. For delimiting crown base, we modelled heights to the first green branch, first green whorl and first dead branch. We started from a model previously established from young trees data representing the average fertility classes found in Vosges mountains. In this model, the averages of branch basal diameter and insertion angle for a whorl were computed from stem height and diameter at breast height. We aimed at: (i) modelling branch basal diameter and insertion angle variance in the whorl; (ii) verifying that the model could be applied to stands grown under conditions not accounted for in the original calibration sample (high site indices, old stands); (iii) determining the geographical area within which the model can be used without requiring any new calibration work.The branch basal diameter and insertion angle studies samples were collected in National Forest Districts Vosges (72 trees) and "Plateau Lorrain" (26 trees). The stands were selected according to their age (from plantation, if this information was available, measured on stumps otherwise) and site index (HØ), defined as the estimated dominant height at stand age 100 years. Northeastern France site classes I and II defined the high fertility modality, while site class III constituted the low fertility modality. Age modalities were: young (35 years), mature (66 and 68 years), old (95 and 133 years). After felling stem data were collected: Total height (Ht), diameter at breast height (D130), year annual height increments. In every second growth unit starting from the current year leader shoot, whorl branches were measured for basal diameter and insertion angle. Branches were declared dead when no green lateral could be found. Crown base was defined by the first green whorl (first ...