Notice bibliographique
Résumé
The Great Lakes forest region is a bioclimatic zone between the northern boreal forest and the eastern deciduous forest of North America. Relatively warm, dry conditions prevailed during the first half of the Holocene, at which time pines (Pinus spp.) and oaks (Quercus spp.) were more prominent than during the second half. The contemporary Great Lakes forest is dominated by sugar maple (Acer saccharum Marsh.) on optimum sites but almost 50 other tree species occur over the spectrum of sites and disturbance regimes encountered throughout the region. Although gap-phase regeneration typifies the undisturbed forest, wildfire and destructive windfall, due to downbursts, are not uncommon. The incidence of forest fire is lower than that in the boreal zone, and the incidence of windfall is lower than that of the deciduous forest to the south and east. Age-structure reconstruction points to the fire-related origin of many Pinus- and Quercus-dominated forests. Paleoecological and neoecological evidence indicates subsequent succession to dominance by either eastern hemlock (Tsuga canadensis (L.) Carr.) or to sugar maple. However, it seems that these shade-tolerant forests remain stable over millennia, even though they may occupy similar sites. Species composition changes only after catastrophic disruption and death of the original cohort. The old-growth stage has been identified by features linked to forest stand age, including a heterogeneous physiognomy, high biomass, high woody necromass, and high species diversity. Assessment of each feature along chronosequences of forests dominated by eastern white (Pinus strobus) and red pine (Pinus resinosa Ait.) yielded a more complicated picture. Productive sites led to forests of much taller stature and earlier canopy breakup than on poor sites. Standing woody biomass aggraded to 120150 years and subsquently declined on all but the most productive sites, where it continued to increase with stand age. Snag volume tended to peak in the 90- to 125-year age range with subsequent decline. On the forest floor, coarse woody debris accumulated in a pattern similar to that of aboveground woody biomass. Plant species diversity was linked to the heterogeneity of substrata, much of which was attributed to woody necromass. These features persisted as legacies from stand growth before forest fire. Consequently, plant species diversity showed no correlation with postdisturbance stand age. The need to adopt a more dynamic view of the distribution and abundance of the Great Lakes forest flora is exemplified by the conservative understorey perennial, ground ginger (Asarum canadense L.) and cryptogamic epiphytes that indicate the continuity of old-growth forests with time. Key words: diversity, downbursts, fire, Holocene, necromass, old-growth criteria, pine chronosequence, site relations, succession.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 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) | 0,002 | 0,009 |
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; les deux têtes enseignantes s’accordent sur ce qui est montré ici.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».