Terrestrial lichen abundance in relation to stand structure and silvicultural history
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Notice bibliographique
Résumé
Terrestrial lichen has been identified as an important factor contributing to suitable woodland caribou (Rangifer tarandus caribou) winter habitat. Conservation efforts to maintain viable populations of woodland caribou in areas where forest management activities take place will require an understanding of the forest conditions that promote suitable habitat characteristics. \nTwo studies were conducted for this thesis. In the first study, terrestrial lichen abundance and stand structure of naturally disturbed and previously harvested forest stands in northwestern Ontario were measured. Terrestrial lichen abundance (% cover) was relatively low and highly variable, but significantly higher in conifer-dominated (4.28 ? 6.83%), than in deciduous (0.60 ? 1.51%) or mixedwood (0.62 ? 1.01%) stands. No significant difference in lichen abundance was found between naturally disturbed (3.14 ? 5.77%) and previously harvested stands (3.41 ? 6.53%). Lichen abundance was significantly greater in stands with non-organic (5.71 ? 7.75%), rather than organic (2.07 ? 4.14%) soil textures. Among non-organic conifer-dominated stands, negative relationships were observed between lichen abundance and canopy closure, basal area, tree height and crown height. \nIn the second study, terrestrial lichen abundance was compared in twenty-four 20 to 40 year-old stands, previously treated with prescribed burning (PB) or mechanical site preparation (MSP). T-test and Mann-Whitney U test results indicated no strong difference in terrestrial lichen abundance between PB (8.95 ? 8.45%) and MSP (2.37 ? 2.03%) treatments, though confounding effects of dominant tree species composition may have contributed to this result. Among the stand structural characteristics measured, canopy closure exhibited the strongest negative relationship with lichen abundance. Negative relationships were also observed between lichen abundance and crown height and basal area. \nThe results of this study indicate that terrestrial lichen abundance is difficult to predict in conifer-dominated stands of northern Ontario. Terrestrial lichen abundance is strongly correlated with overstory structural attributes, which suggests that forest management activities could potentially influence terrestrial lichen abundance by manipulating stand structure to create understory light conditions that are favourable to terrestrial lichen establishment and growth.
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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 | 0,000 | 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 | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 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 découle