Seedbed micro-sites and their role in post-fire succession \nof the lichen-black spruce woodland \nin Terra Nova National Park, Newfoundland
Notice bibliographique
Résumé
Effects of a recent wildfire in the lichen-black spruce woodland in Terra Nova \nNational Park, Newfoundland, were investigated to determine the interaction between fire \nintensity and fire severity; plus effects on forest-floor disturbance, on canopy seed banks, \nand on black spruce regeneration. As there was much exposed mineral soil from ant \nactivity on this site, the potential for enhanced post-fire black spruce recruitment due to \nants was also investigated. A seeding trial considered four potential seedbeds available: \nareas of high severity; areas of low severity; active ant nests; and abandoned ant nests. In \naddition, the amount and distribution of seed rain in the burned area was measured in an \nattempt to assess factors that affect the pattern and success of black spruce recruitment \nfollowing fire. Duff depths were reduced by fire by as much as 50% while lichen depth \nby up to 88%. Ant nests occurred at a density of 6.15 per 100m² in the burned areas \ncompared to 2 per 100m² in the unburned forest. Black spruce seed-fall, while low at 16 539 seeds per ha in the year following the fire, was sufficient for re-establishing the lowdensity \nlichen woodland community at an initial density of 524 seedlings per ha by 2003. \nHowever, a mean cone removal of 52% by non-native red squirrels may be limiting the \nestablishment of a higher-density forest. Available seedbed was limited by the extensive \ncaribou-lichen mat, but over 40% of successful black spruce seedlings in the seeding trial \ngerminated in this substrate, compared with 33% for inactive ant nests and 26% for high \nseverity bum. Seedlings were most likely to become established and survive in \ndesiccation fractures in the lichen mat. The presence of abandoned ant nests did result in \ngermination, but did not necessarily result in establishment as seedling survival was \nreduced from 89% to 44% after winter. Seedling mortality on scorched organic soil \nsubstrate under former spruce canopies was highest at 71 %. Active ant nests produced no \ngerminants in the trial and were the least suitable for germination. Drier and warmer than \nnormal conditions in 2003, resulting in soil moisture deficits, appeared to be the main \nlimiting factor for black spruce germination and survival. The next several years will be \ncritical for subsequent black spruce germination and survival and in determining if reestablishment \nof the recently burned lichen woodland in TNNP will be successful.
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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 | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 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 ».