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Title: Relationships of dead wood patterns with biophysical characteristics and ownership according to scale in Coastal Oregon, USA

Author: Kennedy, Rebecca S.H.; Spies, Thomas A.; Gregory, Matthew J.;

Date: 2008

Source: Landscape Ecolology. 23: 55-68

Publication Series: Scientific Journal (JRNL)

Description: Dead wood patterns and dynamics vary with biophysical factors, disturbance history, ownership, and management practices; the relative importance of these factors is poorly understood, especially at landscape to regional scales. This study examined current dead wood amounts in the Coastal Province of Oregon, USA, at multiple spatial scales. Objectives were to: (1) describe current regional amounts of several characteristics of dead wood; (2) compare dead wood amounts across ownerships; (3) determine the relative importance, according to spatial scale, of biophysical and ownership characteristics to regional dead wood abundance. Dead wood plot data were evaluated with respect to explanatory variables at four spatial scales of resolution: plots, subwatersheds, watersheds, and subbasins. The relationships of dead wood characteristics with biophysical attributes and ownership were diverse and scale-specific. Regionwide dead wood abundance and types varied among ownerships, with public lands typically having higher amounts of dead wood and more large dead wood than private lands. Regression analysis of total dead wood volume indicated that ownership was important at the subbasin scale. Growing-season moisture stress was important at plot, subwatershed, and watershed scales. Topography was important at the two coarser scales. Multivariate analysis of dead wood gradients showed that ownership was important at all scales, topography at the subbasin scale, historical vegetation at watershed and subbasin scales, and current vegetation at plot and subwatershed scales. Management for dead wood and related biodiversity at watershed to landscape scales should consider the distinct dynamics of snags and logs, the importance of historical effects, and the relevance of ownership patterns.

Keywords: Coarse woody debris, snags, logs, legacy, forest management, landscape ecology, topography, forest history, climate, coast range

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Kennedy, Rebecca S.H.; Spies, Thomas A.; Gregory, Matthew J. 2008. Relationships of dead wood patterns with biophysical characteristics and ownership according to scale in Coastal Oregon, USA. Landscape Ecolology. 23: 55-68

 


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