ARBORICULTURE ARBORICULTU & CONTENTS URBAN FORESTRY Volume 42, Issue 5, September 2016 Formerly the Journal of Arboriculture, 1975 – 2005 (Volumes 1 – 31) ® www.isa-arbor.com Keith O’Herrin, Richard J. Hauer, William J. Vander Weit, and Robert W. Miller Homebuilder Practices and Perceptions of Construction on the Wooded Lot: A Quarter Century Later Follow-Up Assessment ........................................................................285 Abstract. Building new homes on wooded lots is common in the upper Midwest, United States. Existing trees are oſten leſt behind dur- ing construction to become part of the future landscape. A study conducted in 1980 found that homebuilders in Portage County, Wis- consin, U.S. generally had a poor understanding of how construction activities could impact the health of trees intended to be preserved. Researchers replicated that study 27 years later by surveying homebuilders in the same region to see how their tree preservation knowledge and use of construction activities have changed during that time. The results indicate few construction activities changed significantly, show- ing that little has changed overall to improve tree preservation. Even though builders significantly improved their knowledge of the negative effects that storage of fill soil on roots poses to tree preservation, they also significantly increased usage of that very same activity. Builders almost never consulted a tree preservation expert and thought doing so was the least important activity when making tree preservation deci- sions. Interest in a tree preservation training workshop was limited. Unless pressured by consumer demand or regulation, builders will prob- ably not improve their tree preservation knowledge, change their construction activities, or include tree experts anywhere in the process. Key Words. Construction; Damage; Followup; Home Builders; Landscape; Perceptions; Public; Tree Experts. ® Christine Moskell, Nina Bassuk, Shorna Allred, and Pat MacRae Engaging Residents in Street Tree Stewardship: Results of a Tree Watering Outreach Intervention ...............................................................................................................................301 Abstract. Street trees provide numerous environmental, community, and health benefits, but municipal urban forestry programs oſten lack the public resources to adequately maintain trees, particularly in the time immediately following planting. Watering trees in the first three years aſter planting is critical for tree survival. A quasi-experimental design was used to test whether an outreach intervention impacted resi- dents’ street tree watering behavior, and whether their watering behavior enhanced soil moisture, an important outcome for tree growth. Residents at mailing addresses for trees in the treatment group received educational materials about watering, while the control group received no educational materials. Soil moisture data was collected weekly at every tree throughout the growing season (May–Septem- ber 2012) and used as a proxy for residents’ watering behavior. Results indicate that the postcards had a positive impact on residents’ water- ing behavior, but that the impact diminished over time. While the impact of the postcards on soil moisture was not statistically significant, the evaluation of the outreach intervention has practical significance for future educational efforts to engage residents in street tree watering. Key Words. Community Engagement; Soil Moisture; Stewardship; Urban Trees. Geoffrey H. Donovan, David T. Butry, and Megan Y. Mao Statistical Analysis of Vegetation and Stormwater Runoff in an Urban Watershed During Summer and Winter Storms in Portland, Oregon, U.S. ....................................................318 Abstract. Past research has examined the effect of urban trees, and other vegetation, on stormwater runoff using hydrologi- cal models or small-scale experiments. However, there has been no statistical analysis of the influence of vegetation on runoff in an intact urban watershed, and it is not clear how results from small-scale studies scale up to the city level. Researchers address this gap in the literature by estimating random-effects regression models of the effect of trees and other vegetation on total run- off and peak runoff for a summer (15–16 June 2010) and a winter (18–19 December 2010) storm in Portland, Oregon, U.S. Researchers found that additional tree canopy cover was associated with lower runoff in the summer storm, but the significance of the tree coef- ficient was sensitive to model structure. Researchers found that additional groundcover (grass and shrubs) associated with lower peak flow in the summer, and this result was robust to model structure. Neither trees nor groundcover were significantly asso- ciated with winter stormwater runoff. Results suggest that trees and other vegetation can be effective at moderating stormwater runoff. However, vegetation is not as effective in the winter, which is consistent with past modeling and experimental studies. Key Words. Economics; Hydrology; Oregon; Portland; Runoff; Stormwater; Trees; Urban Forestry Vegetation. ©2016 | International Society of Arboriculture | ISSN:1935-5297
September 2016
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