Soil Methane Dynamics of Skid Trails and Landings in Managed Northern Hardwood Forests
Notice bibliographique
Résumé
Skid trails and landings are the portions of harvested forests that are used by forestry vehicles; skid trails are the network of trails used to transport logs to the landing, a central storage point where logs are processed and stacked. Soils in these features are highly impacted by the traffic they experience, and often sustain long-lasting changes to soil properties. While temperate forest soils tend to act as a methane (CH4) sink, these altered soil properties can influence soil CH4 dynamics, weakening their strength as a sink or causing a shift to CH4 emissions. This phenomenon has been documented in experimental settings but very few have studied it in situ in harvested forests as well as the soil drivers that contribute to it. We studied soil CH4 fluxes from skid trails and landings in a selection-managed forest in central Ontario, Canada, as well as the properties that may contribute to the observed flux. One-year-old skid trails exhibited high CH4 emissions, particularly from intensively used primary trails that were low-lying and wet. These emissions were correlated to low surface soil porosities and high soil moisture contents. Landings one year after harvest had significant spatial variation but had some strong “hotspots” of high CH4 emissions. CH4 flux on landings was correlated to soil pH and quantities of buried woody residues. On a broader scale, within the first year after harvest emissions from skid trails and landings respectively offset the strength of the CH4 sink from the surrounding untrafficked soils within a harvest area by ~45 and 12%. A chronosequence of skid trails and landings found that highest CH4 emissions occurred one year after a harvest event then began to decrease in the following years. Eventually soils returned to consuming CH4, however in the 15-year study period these soils never recovered to consuming CH4 at the same rate as unharvested soils. Temperate forest soils are an important global CH4 sink, and these findings contribute to the understanding of the effects of forest management on forest CH4 budgets. The results also inform prevention and remedial practices in climate smart forestry practices.
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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 | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| 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) | 0,001 | 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 tête enseignante, 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 ».