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Environmental Sciences

1999

California Polytechnic State University, San Luis Obispo

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Valuation Of Tree Aesthetics On Small Urban-Interface Properties, Richard Thompson, Richard Hanna, Jay Noel, Douglas D. Piirto Sep 1999

Valuation Of Tree Aesthetics On Small Urban-Interface Properties, Richard Thompson, Richard Hanna, Jay Noel, Douglas D. Piirto

Natural Resources Management and Environmental Sciences

A model was developed to predict the value contribution of forest condition on small urban-wildland interface properties. Sample data were collected on property transactions in the Lake Tahoe Basin of California between 1990 and 1994. A variant of the stand density index (SDI) and a tree health measure were added to a list of traditional property characteristics (i.e., location, house size, lot size) to express the influence of tree care on property value. These aesthetic characteristics were statistically significant despite the expected dominant influence of the traditional characteristics. Values for the forest density and health characteristics were estimated and reveal …


A Calibration Procedure Using Topmodel To Determine Suitability For Evaluating Potential Climate Change Effects On Water Yield, Brian Dietterick, James A. Lynch, Edward S. Corbett Apr 1999

A Calibration Procedure Using Topmodel To Determine Suitability For Evaluating Potential Climate Change Effects On Water Yield, Brian Dietterick, James A. Lynch, Edward S. Corbett

Natural Resources Management and Environmental Sciences

An evaluation was conducted on three forested upland watersheds in the northeastern U.S. to test the suitability of TOPMODEL for predicting water yield over a wide range of climatic scenarios. The analysis provides insight of the usefulness of TOPMODEL as a predictive tool for future assessments of potential long-term changes in water yield as a result of changes in global climate. The evaluation was conducted by developing a calibration procedure to simulate a range of climatic extremes using historical temperature, precipitation, and streamfiow records for years having wet, average, and dry precipitation amounts from the Leading Ridge (Pennsylvania), Fernow (West …


Effects Of Above-Ground Biomass Allocation On Soil Nitrogen Demand And Below-Ground Productivity: The Influence Of Stand Density, Christopher Dicus, Thomas J. Dean Feb 1999

Effects Of Above-Ground Biomass Allocation On Soil Nitrogen Demand And Below-Ground Productivity: The Influence Of Stand Density, Christopher Dicus, Thomas J. Dean

Natural Resources Management and Environmental Sciences

Two stands in a loblolly pine (Pinus taeda L.) plantation were established in southeastern Louisiana in 1981 at three initial planting densities (1.2 x 1.2m, 2.4 m., and 3.6 x 3.6m). Height, height to the base of the live crown, and DBH measurements taken in consecutive years, coupled with allometric equations, yielded estimates of annual stand level foliage, branchwood, and stemwood biomass increment in each plot. Stemwood, branchwood, first-year foliage, second year foliage, and litter tissues were obtained in each plot and analyzed for nitrogen concentration, and were used to provide estimates of annual foliar nitrogen retranslocation and above-ground …