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1352 Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast

By Range U. S. A, Christine L. May and Robert E. Gresswell


Abstract: Large wood recruitment and redistribution mechanisms were investigated in a 3.9 km 2 basin with an oldgrowth Pseudotsuga menziesii (Mirb.) Franco and Tsuga heterophylla (Raf.) Sarg. forest, located in the southern Coast Range of Oregon. Stream size and topographic setting strongly influenced processes that delivered wood to the channel network. In small colluvial channels draining steep hillslopes, processes associated with slope instability dominated large wood recruitment. In the larger alluvial channel, windthrow was the dominant recruitment process from the local riparian area. Consequently, colluvial channels received wood from further upslope than the alluvial channel. Input and redistribution processes influenced piece location relative to the direction of flow and thus, affected the functional role of wood. Wood recruited directly from local hillslopes and riparian areas was typically positioned adjacent to the channel or spanned its full width, and trapped sediment and wood in transport. In contrast, wood that had been fluvially redistributed was commonly located in mid-channel positions and was associated with scouring of the streambed and banks. Debris flows were a unique mechanism for creating large accumulations of wood in small streams that lacked the capacity for abundant fluvial transport of wood, and for transporting wood that was longer than the bank-full width of the channel. Résumé: Le recrutement et les mécanismes de redistribution des gros débris ligneux ont été étudiés dans un bassin de 3,9 km 2 supportant une forêt ancienne de Pseudotsuga menziesii (Mirb.) Franco et de Tsuga heterophylla (Raf.) Sarg

Year: 2010
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