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Comparing line-intersect, fixed-area, and point relascope sampling for dead and downed coarse woody material in a managed northern hardwood forest

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Abstract:

We present the results of a timed field trial comparing the bias characteristics and relative sampling efficiency of line-intersect, fixed-area, and point relascope sampling for downed coarse woody material. Seven stands in a managed northern hardwood forest in New Hampshire were inventoried. Significant differences were found among estimates in some stands, indicating a potential for difference in bias in field implementation of the methods. In terms of relative sampling efficiency, results for each method varied among stand. However, point relascope sampling had comparable or better time efficiency than the other methods in most stands.

Nous présentons les résultats d'un essai chronométré sur le terrain visant à comparer les caractéristiques des biais et l'efficacité relative des méthodes d'échantillonnage par intersection de lignes, placettes circulaires à rayon fixe et placettes circulaires à rayon variable à l'aide du relascope pour les débris ligneux grossiers au sol. Sept peuplements ont été inventoriés dans une forêt de feuillus nordiques du New Hampshire. Des différences significatives ont été observées entre les estimations dans certains peuplements, laissant entrevoir la possibilité qu'il y ait des différences dans les biais liés à l'implantation des méthodes sur le terrain. En terme d'efficacité relative d'échantillonnage, les résultats pour chaque méthode variaient selon les peuplements. Cependant, l'échantillonnage au relascope était aussi ou plus efficace du point de vue du temps que les autres méthodes dans la plupart des peuplements.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: August 1, 2004

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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nrc/cjfr/2004/00000034/00000008/art00021
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