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Anomalous diameter distribution shifts estimated from FIA inventories through time / Francis A. Roesch in Forestry, an international journal of forest research, vol 83 n° 3 (July 2010)  

Public [article]  inForestry, an international journal of forest research > vol 83 n° 3 (July 2010) . - pp 269 - 276 Titre : Anomalous diameter distribution shifts estimated from FIA inventories through time Type de document : Article/Communication Auteurs : Francis A. Roesch, Auteur ; Paul C. Van Deusen, Auteur Année de publication : 2010 Article en page(s) : pp 269 - 276 Langues : Anglais (eng) Descripteur : [Termes IGN] diamètre des arbres [Termes IGN] données statistiques [Termes IGN] Etats-Unis [Termes IGN] inventaire forestier étranger (données) [Termes IGN] modèle statistique [Vedettes matières IGN] Inventaire forestier Résumé : (auteur) In the past decade, the United States Department of Agriculture Forest Service's Forest Inventory and Analysis Program (FIA) has replaced regionally autonomous, periodic, state-wide forest inventories using various probability proportional to tree size sampling designs with a nationally consistent annual forest inventory design utilizing systematically spaced clusters of fixed-area plots. This has resulted in significant changes in the spatial-temporal distribution of observations on the nation's forest resource. This paper discusses the resulting changes in the observation of the distribution of tree diameters measured at 1.37 m above ground level. We show that in three of the four FIA regions, a significant portion of the upper end of the diameter distribution has thus far gone unobserved by the new inventory design. We conclude that the reason is not that the larger diameter trees have become less common but rather that there is a low enough probability of observing these trees that they are not being observed. This postulate is supported by the observation that large-diameter trees are not missing from the data acquired by the fourth FIA region (the Pacific Northwest), which uses an additional sampling mechanism for large-diameter trees. We explore the implications of this effect in addition to potential solutions. Numéro de notice : A2010-594 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1093/forestry/cpq009 Date de publication en ligne : 07/04/2010 En ligne : https://doi.org/10.1093/forestry/cpq009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75424 [article]