Table of Contents David W. MacFarlane Quantifying Urban Saw Timber Abundance and Quality in Southeastern Lower Michigan, U.S. ..................................................................................................253 Abstract. There is a growing need for society to use resources efficiently, including effective use of dead and dying trees in urban areas. Harves ing saw timber from urban trees is a high-end use, but currently, much urban wood ends up in landfills or is used for wood chips or biomass fuel. To assess the general feasibility of harvesting urban wood, a regional estimate of urban saw timber quantity, quality, and availability was deve oped for a 13-county area in southeastern lower Michigan, U.S. Conservatively, over 16,000 m3 (560,000 ſt3 ) of urban saw timber is estimated to become available each year in the study area from dead and dying trees, enough to supply the minimum annual needs of five small sawmills. The quality of wood in urban soſtwoods was generally low but comprised only a relatively small portion (10%) of urban wood. Wood quality of urban-grown hardwoods was com- parable to that found in forests in the region, although the absolute volume was nine times less. Although there are potential concerns with harvest- ing urban trees for saw timber such as low availability and poor wood quality, the results of this study suggestthat many of them may be unfounded. Key Words. Saw Timber; Urban Forestry; Wood Products; Wood Recycling. Michael R. Kuhns and Douglas K. Reiter Knowledge of and Attitudes About Utility Pruning and How Education Can Help .......................................................................................................................................... 264 Abstract. A survey was conducted in six cities in the western United States whose electric utilities practice directional pruning for line clearance. Recipients’ knowledge of and attitudes about tree care practices and issues, utility pruning, directional pruning for line clearance, and effects of a simple brochure about utility pruning were determined. Respondents cared a great deal about landscape trees but had not thought much about utility pruning. They felt that utility pruners care most about keeping lines clear but care less about the trees, that companies are poor at explai ing pruning to the public, and slightly disagree that large trees should be removed and replaced with small trees under lines. Those who had thought a lot about utility pruning were less trusting of those who do the pruning. The brochure increased trust of utility pruning personnel and the pe ception that they care about trees and greatly increased agreement that those personnel are highly trained professionals. Preference for topping over directional pruning was reduced by receiving a brochure, although topping still was preferred. Most supported line burial and were willing to pay higher rates for burial. Several recommendations are suggested for utilities and researchers, including the need for utilities placing an increased emphasis on communication with the public regarding these matters. Key Words. Acceptability; Aesthetics; Directional Pruning; Electric Utility; Topping; Urban Forestry. Mengmeng Gu, James A. Robbins, and Curt R. Rom Early Landscape Performance of 20 Field-Grown Birch Genotypes at Two Locations in Arkansas, U.S. and Response to Irrigation ............................................................................. 275 Abstract. Twenty birch genotypes were planted in the field in April 2002 to evaluate their survival and growth at Fayetteville and Hope, Arkan- sas, U.S., and to evaluate their response to two irrigation regimes at Fayetteville. Aſter four growing seasons, the overall tree survival was 62% and 30% at Fayetteville and Hope, respectively. Betula pendula ‘Trost’s Dwarf ’, B. ermanii, and B. albosinensis were among genotypes with the lowest survival at both locations. Betula populifolia, B. nigra ‘BNMTF’, B. nigra ‘Cully’, and B. × ‘Royal Frost’ had greater survival aſter four grow- ing seasons than the other birch genotypes investigated. Betula nigra ‘BNMTF’ and B. nigra ‘Cully’ were taller and had greater trunk diameter than the other surviving birch genotypes at both locations aſter four growing seasons. At the end of 2005, B. utilis var. jacquemontii was the shortest and had the smallest trunk diameter among the 18 surviving genotypes at Fayetteville, and B. papyrifera ‘Uenci’, B. populifolia ‘White- spire’, B. maximowicziana, and B. lenta were the shortest and had the smallest trunk diameter among the 13 surviving genotypes at Hope. At Fayetteville, B. nigra and B. davurica had the greatest annual change in tree height in both 2004 and 2005, and B. davurica was among geno- types having the greatest annual change in trunk diameter in 2002, 2004, and 2005. At Hope, B. papyrifera had the greatest annual change in tree height in both 2004 and 2005, and B. davurica had the greatest annual change in trunk diameter in 2004. In 2005, annual change was not significant among birch genotypes at Hope. At Fayetteville, water-stress treatment reduced final tree height and trunk diameter in birch trees. Key Words. Growth; Irrigation Regime; Survival. ©2007 | International Society of Arboriculture | ISSN:1935-5297
July 2007
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