Table of Contents Robert E. Loeb and Samuel King Landslides and the Urban Forest .................................................................................................. 213 Abstract. Trees and saplings were felled and killed by rockslides and soil slides formed during the record breaking rains of May 1–2, 2010, in Radnor Lake State Natural Area, Nashville, Tennessee, U.S. The losses were analyzed by species; stem basal area; root plate diameter and depth; percent slope; occurrence in a rockslide or soil slide as well as species classification as a lateral root system species versus tap or heart root system species. The number of stems lost for each species had a distribution similar to the results of the 2009 Natural Area survey but the number of saplings was significantly underrepresented at the landslide sites. Tree deaths were nearly five times greater than saplings lost. Although there were nearly equal numbers of tree and sapling stems classified as possessing a lateral root system versus tap or heart root sys- tem, 74% of the sapling losses were from surface root system species. The means for root plate diameter and depth were significantly larger in rockslides than soil slides even though the mean stem basal area did not differ significantly. For both slide types, slope steepness was not correlated with root plate depth, root plate diameter, or stem basal area. Similarly for both root system classi-fications, slope steepness was not significantly correlated except for surface root system trees with root plate depth. Planting tap root system trees reduces the risk of land- slide, but advances in the cultivation of taxa, such as hickory (Carya spp.), are needed to assure tap root preservation during transplantation. Key Words. Rockslide; Root Plate; Root System; Soil Slide; Torrential Rain; Urban Trees. Kendra J. Labrosse, Robert C. Corry, and Youbin Zheng Effects of Tree Stabilization Systems on Tree Health and Implications for Planting Specifications ............................................................................................................................... 219 Abstract. A tree stabilization system (TSS) is specified to promote stability and maintain tree posture at transplant. However, staking and guy- ing can compromise tree health. The authors of the current study have investigated the effects of such stabilization systems on trees to inform urban forest planting specifications. Visual symptoms for tree health were recorded for 488 trees with and without TSSs in Guelph, Ontario, Canada. Results showing symptoms of stunted growth, death, and pest/disease were fewer on trees observed with TSSs. Health was negatively impacted by TSSs by producing more symptoms of girdled trunks, swelling, and wilting. Trees planted on public land were found to benefit from being stabilized while trees on private land expressed more negative health effects when observed with trunk support. Implications for urban forest professionals include limiting tree stabilization practice to site conditions where their use is warranted along with timely removal. Key Words. Guying; Staking; Transplant; Trunk Support; Urban Forest. M. Sreetheran, M. Adnan, and A.K. Khairil Azuar Street Tree Inventory and Tree Risk Assessment of Selected Major Roads in Kuala Lumpur, Malaysia ........................................................................................................................................ 226 Abstract. Tree planting programs in Malaysia have progressed as planned. However, the subsequent management of the street trees, particularly at Kuala Lumpur City Hall, is not well undertaken due to inadequate information for management and maintenance purposes. There has never been a systematic tree survey conducted to inventory street trees in Kuala Lumpur. With this, a survey was conducted to collect comprehensive information on tree structure, species composition, species diversity, and tree defects and disorders. A total 2,191 street trees were surveyed. Key Words. Hazard Tree Management; Species Diversity; Tropics; Urban Trees; Urban Forest Management. Richard J. Hauer, Angela J. Hauer, Dudley R. Hartel, and Jill R. Johnson Rapid Assessment of Tree Debris Following Urban Forest Ice Storms ......................................... 236 Abstract. This paper presents a rapid assessment method to estimate urban tree debris following an ice storm. Data were collected from 60 communities to quantify tree debris volumes, mostly from public rights-of-way, following ice storms based on community infrastructure, weather parameters, and urban forest structure. Ice thickness, area of a community, and street distance are signifi- cant predictors for estimating debris from ice storms. Results from this study provide a way to estimate woody debris volumes from urban trees immediately following an ice storm. The model can also be used to predict debris volumes for storm preparedness planning. Key Words. Emergency Management; Ice Storm; Storm Damage; Tree Debris; Urban Forest. ©2011 | International Society of Arboriculture | ISSN:1935-5297
September 2011
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