ARBORICULTURE ARBORICULTU & CONTENTS estry; Data Quality. Richard Hallett and Tanner Hallett Citizen Science and Tree Health Assessment: How Useful Are the Data? ...................................236 Abstract. Emerald ash borer (Agrilus planipennis) has killed millions of trees in the United States. Community managers face treatment or removal decisions for all publicly owned ash (Fraxinus spp.) trees. These decisions are based on the overall condition of each tree. In this study, the U.S. Forest Service-trained a Boy Scout troop in Oconomowoc, Wisconsin, U.S., in a tree health assessment protocol that used rubrics designed to measure physiological stress symptoms. The city provided tree inventory data, which included the location of 316 city- owned ash trees. After a two-hour training session, the Scouts and adult leaders assessed all ash trees in August 2015. A tree health expert re-assessed 20% of the trees. The protocol measured diameter at breast height and included a suite of tree stress assessment variables. Researchers used a five-class system for defoliation, leaf discoloration, and overall vigor. Fine-twig dieback was estimated in 5% classes. Digital photographs were taken and automatically processed so as to measure percent crown transparency. Expert/volunteer agreement for diameter at breast height was within 2.5 cm 92% of the time; defoliation, discoloration, and vigor were within two classes 100%, 93%, and 92% of the time, respectively. Crown dieback estimates were within 10% of each other 76% of the time, and transparency estimates were within 15% of each other 76% of the time. Researchers calculated an overall stress index value and ranked the trees from lowest to highest stress. The volunteer-generated data enabled Oconomowoc to make science-based management decisions for its infested ash trees. Key Words. Agrilus planipennis; Ash; CBM; Community-Based Monitoring; Emerald Ash Borer; Fraxinus; Tree Inventory; Wisconsin. Keir Hamilton, Andrew K. Koeser, and Shawn M. Landry Accuracy of Volunteer-Derived Data from a Single-Day Inventory Event Built Around a Crowdsourced Tree Mapping Application ...................................................................................248 Abstract. Freely available ecosystem service models, like those incorporated in the i-Tree suite of tools, have helped scientists and practitio- ners estimate the environmental functions and economic benefits associated with their urban forest. Traditionally, professional inven- tory crews have been used to collect the inventory data needed for these models, but several cities have established crowdsourcing platforms to allow volunteers to map and inventory trees. Students in this study hosted and participated in an Arbor Day inventory collection event, using a newly released crowdsourcing application for mapping trees and estimating ecosystem services. The students located, identified, and measured trees on the University of South Florida campus (Tampa, Florida, U.S.) aſter a brief training session. Aſter the one-day event, a more rigorously-trained field crew attempted to relocate the inventoried trees to assess the accuracy and variability of the data collected. Of the 339 trees inventoried at the original event, only 57.8% (n = 196) had coordinates that were accurate enough to re-measure. Of the 196 re-measured trees, 91.3% (n = 179) were cor- rectly identified. However, only 47.9% (n = 91) of trees had dbh measurements within a one inch (2.5 cm) threshold for accuracy. Results of this experi- ment offer insights for communities looking to host special inventorying events to increase participation in crowdsourcing tree inventory initiatives. Key Words. Citizen Science; Crowdsourced Data; Data Accuracy; Data Quality; Ecosystem Services; Florida; Tree Inventory; Urban Forestry. URBAN FORESTRY Volume 44, Issue 6, November 2018 Formerly the Journal of Arboriculture, 1975 – 2005 (Volumes 1 – 31) ® www.isa-arbor.com Lara A. Roman, Lindsay K. Campbell, and Rebecca C. Jordan Civic Science in Urban Forestry: Introduction to a Second Special Issue ...................................233 Abstract. This special issue is the second of two dedicated to civic science. As shared in the first special issue, “Civic science in urban forestry is a means of engaging the public in the study, management, and care of urban trees, and includes varied approaches with different disciplinary foundations” (Roman et al. 2018). We describe highlights from six articles (including original research and short communications) that assess program evaluation, data quality, and volunteer motivation. With these arti- cles, we aim to continue our consideration of current best practices and future research needs for urban forestry community science. Key Words. Citizen Science; Civic Ecology; Co-management; Knowledge Co-production; Participatory Research; Urban Ecology; Urban For- ® ©2018 | International Society of Arboriculture | ISSN:1935-5297
November 2018
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