Graduate Thesis Or Dissertation
 

Conifer growth and plant distribution under diffferent light environments in the Siskiyou Mountains of southwestern Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nz8064033

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  • In a mountainous region of southwestern Oregon where temperature, moisture and nutritional status of forest communities have already been classified, the influence of tight upon conifer growth and plant distribution was investigated. Light, measured in calories cm day' (400-700 nm) during clear summer days was used as an index to the yearly light environment. An ozalid integration technique, highly correlated with spectroradiometer data, was employed. Multiple regression was employed to evaluate site variables affecting growth. Results indicated that Shasta red and white fir occurred at lower light levels than Douglas-fir; at intermediate intensities Douglas-fir leader elongation was greater than either true fir, suggesting that it could compete successfully in thinned stands. All investigated conifers grew best at the highest light levels record indicating that once established, exposed trees have at advantage. Several herbaceous plants appeared useful as indicators of low or high light regimes, but most plant species occurred across the complete light gradient.
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  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B+W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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