ASSESSMENT OF THE QUALITY AND PRODUCTIVITY OF LODGEPOLE PINE GROWN IN THE WESTERN PART OF LATVIA
Notice bibliographique
Résumé
The research aims to examine the pace of growth of lodgepole pine, the amount of damage caused by biungulates and the quality of trunks for lodgepole pine provenances growing in the western part of Latvia in the areas around Ugale and Kuldiga, identifying the most damage-resistant and promising provenances for cultivation in Latvia. In Latvia, foresters and plant breeders have been working for years to increase the quality and productivity of local tree species, while assessing various forest stand management patterns and trying to reduce the rotation period of stands. Nowadays, because of climate change, i.e. with the climate becoming warmer, it is clear that in the future in Latvia not only a management strategy for the dominant tree species have to be changed but also the possibilities of introducing new tree species suitable for the conditions in Latvia need to be considered to reduce the forest rotation period. At the same time, introducing new tree species requires considering that the tree species must have economic potential, i.e. the wood has prospects for being processed and consumed (e.g. construction) in the local region, as carbon is sequestrated during the growth of the trees and stays in Latvia. Lodgepole pine is one of the tree species that could have prospects for cultivation on an industrial scale in plantations, which was introduced in Latvia at the beginning of the last century. Based on the experience of Swedish foresters in growing lodgepole pine on an industrial scale in the 1980s, experimental lodgepole pine plantations were established in Latvia by using both domestic seeds and those from the natural range in Canada and the United States, as well as from Sweden. The research analysed the following tree inventory data collected from the experimental plantations of lodgepole pines at the ages of 27 and 43 years in the western part of Latvia: the height and diameter of the trees and compared the data for Scots pine grown in identical conditions. In addition, the proportions of trees damaged by deer etc. as well as the proportions of trees with multiple tops and branch-to-stem attachments because these defects significantly reduce the chances of producing quality roundwood assortments in the future were analysed for both species. The data were processed using parametric methods. In an experimental plantation in the area near Ugale, 43-year-old lodgepole pines demonstrated a performance similar to that of Scots pines, with average heights of 18.2 and 18.4 meters and diameters of 19.1 and 19.0 cm, respectively, i.e. the differences were insignificant. In the plantation near Kuldiga, the differences were found significant, as the average height difference between the species was 1.3 m, while the diameter difference was 1.3 cm. It was concluded that lodgepole pines had lower trunk quality and were more damaged by deer. It was also found that the least productive lodgepole pine provenances were more damaged by deer.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».