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Assessing the effect of snow/water obstructions on the measurement of tree seedlings in a large-scale temperate forest inventory / C. W. Woodall in Forestry, an international journal of forest research, vol 86 n° 4 (October 2013)  

Public [article]  inForestry, an international journal of forest research > vol 86 n° 4 (October 2013) . - pp 421 - 427 Titre : Assessing the effect of snow/water obstructions on the measurement of tree seedlings in a large-scale temperate forest inventory Type de document : Article/Communication Auteurs : C. W. Woodall, Auteur ; James A. Westfall, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 421 - 427 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Etats-Unis [Termes IGN] forêt tempérée [Termes IGN] impact sur les données [Termes IGN] inventaire forestier étranger (données) [Termes IGN] neige [Vedettes matières IGN] Inventaire forestier Résumé : (auteur) National-scale forest inventories have endeavoured to include holistic measurements of forest health inclusive of attributes such as downed dead wood and tree regeneration that occur in the forest understory. Inventories may require year-round measurement of inventory plots with some of these measurements being affected by seasonal obstructions (e.g. snowpacks and seasonal flooding). In order to assess the potential effects that snow/water obstructions may have on the measurement/analysis of forest seedlings across large scales, the differences in seedling abundance between two inventory measurements (∼5-year remeasurement period) and as affected by snow/water depth was ascertained using a repeated forest inventory across the eastern US. Results indicate that there is a general trend of decreasing seedling density over time (−33.16 seedlings ha−1 year−1) in the eastern US, with snow/water depths in excess of 15 cm significantly affecting resulting estimates of seedling abundance. Although snow/water obstruction to seedling measurement occurred on ∼9 per cent of inventory plots across the eastern US, snow was a much more common situation occurring on nearly 50 per cent of plots (at time 1, 2 or both) at high latitudes (>45°). Given the statistically significant effect of snow/water on seedling abundance estimates, tree regeneration assessments should not include observations obstructed by snow/water depths that exceed minimum seedling heights. Furthermore, seedling abundance inventories may mitigate the influence of measurement obstructions by sampling only during the summer or incorporating climate information into their sampling logistics. Numéro de notice : A2013-788 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1093/forestry/cpt013 En ligne : https://doi.org/10.1093/forestry/cpt013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78312 [article]