Graduate Thesis Or Dissertation

 

Height-diameter and volume equations, growth intercept and needle length site quality indicators, and yield equations for young ponderosa pine plantations in Neuquén, Patagonia, Argentina Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/4j03d205h

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  • Ponderosa pine (Pinus ponderosa Dougl. ex Laws.) is the most widely planted species in the Patagonian Andes region of Argentina for economic development. However, information on site quality and yield is so limited that potential forest investors and managers do not have a reliable basis on which to make sound decisions. To ameliorate this problem I completed five silvicultural studies in Neuquen, the northernmost province where ponderosa pine is planted. Data were collected in 127 stands throughout Neuquen. 1) Four height(H)-diameter(D) equations were tested and [math equation] was selected to predict individual tree H at the stand level. 2) Nineteen volume (V) equations were fitted with V = β₀+ β₁ D²H + β₂D + ε and V = β₀ + β₁D + β₂D² + ε selected to predict total inside-bark tree V when H data are and are not available respectively. The effect of crown ratio was not significant when added to D and H. A comparison demonstrated that trees of the same D and H appeared to have more volume in Neuquen than in western United States. 3) The ability of 13-growth intercepts to predict stand top height and crop height was examined between ages 12 and 20 years. A growth intercept index (GII) was developed to determine site quality based on the length of the five internodes starting at or above breast height. 4) The ability of needle length, measured around the bud on the terminal leader (TNL) and on the tip of first order lateral branches (LNL), to predict top height at age 20 was tested. A preliminary needle length index to determine site quality based on LNL was developed. 5) Yield equations based on stand age, GII, trees/ha (or basal area), and longitude, were developed. These equations predict higher volumes for Neuquén stands than those attained by highly productive California ponderosa pine plantations of the same age, dominant height, and trees/ha. Neuquén stands support very high stocking and they exhibit negligible mortality despite their very high basal areas and relative densities by North American standards.
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