Graduate Thesis Or Dissertation
 

Recruitment trends and physical characteristics of course woody debris in Oregon Coast Range streams

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  • This study investigated the long-term consequences of timber stand removal on the recruitment, physical characteristics, and spatial distribution of coarse woody debris in small (second- and third-order) streams of the Oregon Coast Range. A chronosequence of stream-stand systems, ranging from 21- to 140-years since disturbance (YSD), were sampled to determine temporal trends in coarse woody debris characteristics along with successional changes in riparian forests. Total debris volumes ranged from 135 to 864 cubic meters per hectare. No distinct trend was found in the total volume of debris over time because of the variable effects of the disturbance event on pre-disturbance debris volumes (debris delivered prior to or during the disturbance event). Post-disturbance deliveries (debris delivered after disturbance by second-growth stand) of deciduous debris increased through 65-YSD then decreased. Post-disturbance coniferous debris volumes, which were first detected at the 28-YSD site, increased from 28- to 140-YSD. Pre-disturbance coniferous debris comprised the largest proportion of the total volume in the stream system until approximately 122-YSD at which time post-disturbance coniferous debris made up the largest proportion of total debris volume. At all sites the largest volume of pre-disturbance debris volumes were in the large (greater than 0.30 meters) diameter size class while the largest proportion of post-disturbance debris volumes were in the large diameter class only at the 65- through 140-YSD sites. The largest proportion of pre-disturbance debris volumes were in the large (greater than 4.0 meters) length size class at the 28- through 140-YSD sites and the largest proportion of post-disturbance debris was in the large size class at the 28- through 140-YSD sites. Morisita's index of dispersion, I[subscript σ] was used to test the type of spatial distribution pattern followed by the debris pieces. Results indicate that debris pieces in the pre- and post-disturbance delivery classes along with total pieces tended to fol 1cM a contagious (clumped) spatial distribution pattern at all sites. Results from this study will provide an improved perspective of the long-term forest stand and coarse woody debris dynamics associated with riparian areas.
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