Graduate Thesis Or Dissertation

 

Prediction of the biomass, leaf area, and crown area of sprout clumps of tanoak (Lithocarpus densiflorus (Hook. and Arn.) Rehd.) : a technique for assessing site occupancy by this species Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1c18dj656

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  • Tanoak (Lithocarpus densflorus (Hook and Am.) Rehd.), an evergreen hardwood tree that grows abundantly in southwest Oregon and north California, sprouts vigorously after a disturbance, such as logging or fire These sprouts form clumps that can hamper conifer regeneration on clearcuts and in shelterwoods. In order to obtain a quantitative measure of the site occupancy by tanoak sprout clumps, aboveground biomass and leaf area were estimated for a range of sprout clump sizes of age 1 to 6. Both variables were linearly correlated with the diameter of the original parent tree at breast height (dbh). Equations were developed for predicting sprout clutnpbiomass, leaf area, and crown area through age 6 from the dbh of the original parent tree. Thus, by knowing the diameters of tanoak trees prior to cutting, the bioinass, leaf area, and crown area of the developing sprout clump stand can be predicted up to 6 years after cutting. Biomass and leaf area were also linearly correlated with crown area. This permits the estimation of tanoak site occupancy (i.e., biomass/ha, leaf area index, and percent crown cover) in existing brushfields, based on measurements of clump size derived from aerial photos or ground surveys. Examples of the use of these methods are included.
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