Research Highlights - Urban Natural Resource Stewardship
More than 80% of the U.S. population lives in urban and suburban areas. The urban forests---street and park trees as well as landscape plantings on private lands---provide important ecosystem services to urban residents and workers. A healthy urban forest can help reduce air pollution and urban core temperatures and thus make cities more livable. Mitigation of past declines of urban forests and open space; maintenance of the health of street trees and open spaces; revitalization of neighborhoods and righting of past environmental injustices are important issues for urban forest managers.
2012 Research Highlights
From World's Largest Landfill to New York City's Newest Park
The Fresh Kills Salt Marsh, at the southwestern corner of Staten Island in New York City, was once the world's largest landfill. Now the NYC Department of Parks and Recreation is converting the landfill into a park and a citywide cultural and recreation destination through extensive ecological restoration and landscape planning efforts. At 2,200 acres, Fresh Kills Park will be the largest park developed in New York City in more than 100 years. Forest Service researchers at the New York City Urban Field Station and throughout the NRS are working with university cooperators to explore the process of conversion and its impacts on the social and biophysical landscape. Researchers assessed Staten Island residents' attitudes toward the park, developed a communications strategy to address public health concerns about it, and used focus groups to understand residents' memories of the landfill as well as their fears and interests in using the future park. In another study, native poplar and willow plants collected from Staten Island are being propagated at the NRS Institute for Applied Ecosystem Studies in Rhinelander, WI, where they will be grown in the greenhouse and hybridized, and the most successful genotypes will be outplanted at Fresh Kills Park.
Herb Schroeder (retired), NRS; David Klenosky, Purdue University; Carrie Grassi and Eloise Hirsh, NYC Department of Parks and Recreation Fresh Kills Team; Phil Gleason, NYC Department of Sanitation; Christine Vogt, Michigan State University; Deborah Popper and Rich Flanagan, College of Staten Island
U.S. Urban Tree Cover Declining
Trees in urban areas provide many benefits to city residents. But Northern Research Station scientists have found that urban tree cover has been declining in recent years at a rate of about 20,000 acres per year or about 4.0 million trees per year. Recent analyses by NRS scientists reveal that many forces such as urban development, insects and diseases, natural regeneration, and tree planting are constantly changing the urban tree cover, both positively and negatively. Although tree cover is declining within most urban areas, the development of some urban areas can increase regional tree cover, especially in grassland-dominated states. Understanding these changes is leading to better management plans for sustaining tree cover and its associated benefits for current and future generations.
U.S. Forest Service: RPA Assessment Staff and State and Private Forestry Urban and Community Forestry Program; SUNY; National Science Foundation
Nowak, David J.; Greenfield, Eric J. 2012. Tree and impervious cover change in U.S. Urban Forestry & Urban Greening. 11(1): 21-30.
Nowak, David J.; Greenfield, Eric J. 2012. Tree and impervious cover in the United States. Landscape and Urban Planning. 107: 21-30.
More Trees Associated with Less Crime in Greater Baltimore
Northern Research Station scientists found a strong inverse relationship between tree canopy and crimes of robbery, burglary, theft, and shooting when they compared high-resolution tree canopy data and geocoded crime point data in the Baltimore region. These findings add to the literature on the relationship between crime and vegetation in a number of ways. First, the findings show that where there are more trees there is less crime. Second, this result holds for both public and private land, but it is stronger for public land. Third, when spatial autocorrelation is adjusted for, the overall result still holds, but the magnitude is not as great. Finally, it appears there is some slight geographic variability in the relationships between trees and crime and that a few isolated areas see a positive relationship between trees and crime. The modeling results indicated conservatively that a 10 percent increase in tree canopy was associated with a roughly 12 percent decrease in crime.
Austin Troy, University of Vermont
Troy, Austin; Grove, J. Morgan; O'Neill-Dunne, Jarlath. 2012. The relationship between tree canopy and crime rates across an urban-rural gradient in the greater Baltimore region. Landscape and Urban Planning. 106: 262-270.
Understanding Urban Civil Environmental Action Across the U.S.
Visualizing where and how hundreds of civic environmental stewardships groups are working in cities across the United States has gotten easier for the public, municipal agencies, and nonprofits, thanks to the continued work of the Stewardship Mapping and Assessment Project (STEW-MAP). STEW-MAP, developed by scientists from the Northern Research Station, supports urban natural resource management, policymaking, and public outreach with databases and interactive maps. This year, the STEW-MAP team continued to expand the project's geographic reach as well as its products and platforms. The team has launched a new multi-city online portal (http://stewmap.net/), which provides information about STEW-MAP projects in New York City, Chicago, Baltimore, and Seattle, including maps, network diagrams, and publications to date.
Dale Blahna, Kathy Wolf, PNWRS; Dana Fisher, University of Maryland; James Connolly, Northeastern University; Dexter Locke, NRS/New York City Department of Parks and Recreation; Steve Romalewski and Christy Spielman, CUNY Center for Urban Research; Oliver Bazinet, University of Washington; Mark Bouman, Field Museum
Fisher, Dana R.; Campbell, Lindsay; Svendsen, Erika S. 2012. The organisational structure of urban environmental stewardship. Environmental Politics. 21(1): 26-48.
Connolly, James J.; Svendsen, Erika S.; Fisher, Dana R.; Campbell, Lindsay K. 2013. Organizing urban ecosystem services through environmental stewardship governance in New York City. Landscape and Urban Planning. 109: 76-84.
2011 Research Highlights
Culturally Appropriate Conservation Education for the Hmong American Community
Forest Service researchers produced a conservation education DVD in partnership with the Hmong community titled “The Wildlife and Wilderness Exploration Show.” The DVD puts a modern twist on traditional Hmong storytelling, delivering key messages in entertaining and educational segments covering a wide range of topics. The educational messages were identified through interviews with Hmong natural resource professionals across the US.
Connecting ethnic minority communities with nature and nature-based activities is challenging, especially so when conservation professionals and educators lack culturally appropriate materials and outreach tools. A Forest Service scientist, working with academics and Hmong natural resources professionals and the Hmong arts and theater community, developed a DVD---“The Wildlife and Wilderness Exploration Show”---in a modern twist on traditional Hmong storytelling with English subtitles. The educational messages cover topics such as using public land, regulations and safety, fire prevention, gathering wild plants, and the concept of “leave no trace.” In contemporary Hmong American culture, DVDs are a popular form of entertainment and cultural learning, particularly appropriate for new refugees and elders with little proficiency in English.
Foung Heu, Digital Motion LLC, St. Paul, MN; Michele Schermann, University of Minnesota, St. Paul, Bioproducts and Biosystems Engineering; May Lee-Yang, Hmong Arts Connection, St. Paul, MN; and Kao Thao, Minnesota Department of Natural Resources, Fort Snelling State Park
Street-Level Views of Climate Change
Forest Service researchers and partners interviewed residents of two Chicago neighborhoods about their awareness of climate change and their own climate-friendly behaviors. They found that residents have varying levels of knowledge about climate change and identified many opportunities to simultaneously meet neighborhood goals and mitigate the impacts of climate change. The findings will help the City of Chicago shape its Climate Action Plan outreach to residents and the lessons learned are applicable in other places as well.
Forest Service scientists and partners investigated climate-friendly attitudes and behaviors in two Chicago neighborhoods in order to assist the City of Chicago with implementing its Climate Action Plan. Some residents were aware of climate change and the actions they could take to minimize its effects. Many others were less aware of climate change but still engaged in some climate-friendly practices that could be supported and built upon. The research suggests that in order to advance the goals of the Climate Action Plan at the neighborhood level, the City of Chicago needs to understand the issues of importance in each neighborhood, assess the ways that these are related to climate change mitigation or adaptation, and develop climate change goals that address residents’ concerns.
Jennifer Hirsch, Field Museum; City of Chicago Department of Environment
Westphal, L.M. and J.L. Hirsch. 2010. Engaging Chicago residents in climate change action: Results from rapid ethnographic inquiry. Cities and the Environment. 3(1):article 13. http://escholarship.bc.edu/cate/vol3/iss1/13. 16 p.
Five Years after the Fire, Effects on Community Still Linger
Persistant long-term effects of wildfire can limit community recovery years later
Organizations helping communities recover from the effects of wildfire need to understand the issues and conditions that are likely to persist even years later. In this study of communities affected by the Rodeo-Chediski fire five years after the event, Forest Service scientists and their university colleagues found that although the community took some positive actions in response to the fire, other negative impacts persist.
Forest Service partners: National Forest System, Southwestern Region
External partners: Washington State University, Department of Natural Resource Sciences; University of Idaho, Department of Agricultural Economics and Rural Sociology
Carroll, M.S.; Paveglio, T.; Jakes, P.J.; Higgins, L.L. 2011. Nontribal community recovery from wildfire five years later: the case of the Rodeo-Chediski fire. Society and Natural Resources 24: 672-687.
Carroll, M.S.; Cohn, P.J.; Seesholt, D.N.; Higgins, L.L. 2005. Fire as a galvanizing and fragmenting influence on communities: the case of the Rodeo-Chediski fire. Society and Natural Resources 18: 301-320.
Non-native Forest Pathogens Cost Homeowners Millions of Dollars Annually
Two big killers of residential trees--the oak wilt pathogen in the East and the sudden oak death (SOD) pathogen in the West cost homeowners millions of dollars annually. Millions are spent to treat, remove, and replant oak trees and millions are lost in property value where ever these diseases have spread. Forest Service researchers calculated economic costs and losses to homeowners and communities and found that programs to slow the spread of forest diseases such as oak wilt and sudden oak death provide important benefits, in terms of reduced expenditures and losses, to both homeowners and communities.
Non-native forest pathogens kill many thousands of trees annually in the United States. Two serious fungal diseases are oak wilt in the East and sudden oak death (SOD) in the West. Information on economic costs and losses to landowners and municipalities is limited, especially for residential areas. Forest Service researchers predicted the spread of SOD in California and oak wilt in Anoka County, MN, over the decade 2010-2020 and then predicted annual expenditures for oak treatment, removal, and replanting and property value losses associated with tree mortality. For SOD in California, they predicted that annual expenditures could reach almost $1 million and annual property value losses, up to $13 million. For oak wilt in a single county in Minnesota, they predicted annual expenditures of $2 to 6 million. Although the predicted amounts are substantial, they are, nevertheless, lower bounds on total economic losses because of reduced ecosystem services such as water quality and increased safety hazards. Quantifying expenditures and losses to landowners is critical to strategies for prevention, management, and research of diseases and pests in forests.
Kent Kovacs, Frances Homans, Tetsuya Horie, Shefali Mehta, and David Smith, University of Minnesota; Ross Meentemeyer, University of North Carolina, Charlotte; Chris Gilligan and Nik Cunniffe, Cambridge University, UK; and Arwin Pang, University of Nevada, Reno
Kovacs, Kent; Vaclavik, T.; Haight, R.G.; Pang, A.; Cunniffe, N.J.; Gilligan, C.A.: Meentemeyer, R.K. 2011. Predicting the economic costs and property value losses attributed to sudden oak death damage in California (2010-2020). Journal of Environmental Management 92: 1292-1302.
Haight, R.G.; Homans, F.R.; Horie, T.; Mehta, S.V.; Smith, D.J.: Venette, R.C.. 2011. Assessing the cost of an invasive forest pathogen: A case study with oak wilt. Environmental Management 47: 506-517.
2010 Research Highlights
Urban and community forest summaries for the lower 48 States
NRS scientist David Nowak and others have recently published several important summaries of tree and forest information. The first is a summary and comparison of urban tree cover and its associated benefits in the lower 48 United States, Sustaining America’s Urban Trees and Forests (GTR-NRS-62). The second is a compilation of tree and impervious cover data and population statistics for each of the lower 48 United States (in seven publications, GTR-NRS- 38, 47, 50, 54, 56, 58, & 59) using National Land Cover Data (NLCD) and U.S. Census data.
Statistics are reported and mapped for every community, county sub-division, and county in each state and for urban and community lands. Ecosystem services provided by these forests and trees were estimated. This information was compiled by NRS scientists David Nowak and Eric Greenfield and should prove useful to those developing state urban forest assessments and plans.
Several other parts of the Forest Service were partners in these projects: the RPA Assessment Staff; State and Private Forestry’s Urban and Community Forestry Program; the Cooperative Forestry Staff; and the Northeastern Area; and the Pacific Northwest Research Station.
Fungicide treatment alters wood anatomy and suppresses oak wilt
Oak wilt, a devastating fungal disease of mature trees in rural and urban forests of the eastern and southern U.S., is spread by insects that visit tree wounds (including pruning cuts) and also travels through natural root system grafts. Injection of the fungicide propiconazole in the root flares has been standard commercial practice by arborists, who have found that retreatment is necessary after several years. NRS scientist Jennifer Juzwik, in collaboration with the University of Minnesota and a commercial arboriculture company, found that injected propiconazole in the tree roots and lower stem degraded below levels required to stop the disease fungus after two years.
Results of a related study showed that alterations of the wood anatomy formed in the first to third growing seasons after injection into red oaks may likely contribute to the control of oak wilt during the same time period. Juzwik’s findings provide the scientific basis for properly-timed applications of the fungicide to control oak wilt as part of an integrated oak wilt control program.
Ryan Blaedow and Brian Barber, University of Minnesota; Shawn Bernick, Rainbow Treecare Scientific Advancements; Mark Stennes, S & S Tree Specialists, Inc.A; International Society of Arboriculture TREE Fund; U.S. Forest Service, Pesticide Impact Assessment Program; Minnesota Turf and Grounds Association
Models for ecological restoration in urban areas: Lessons from the USA and Europe
Ecological restoration often aims to recreate so-called pre-settlement conditions, but this can be problematic in urban areas where human activities have erased most traces of pre-settlement conditions. NRS researchers Paul Gobster and Lynne Westphal and a German colleague, Matthias Gross, analyzed urban restoration projects and developed several alternative models that articulate the various possible types of restoration projects.
Matthias Gross, Department of Urban and Environmental Sociology, Helmholtz Centre for Environmental Research, Germany, UFZ
Perceptions of crime and its impacts on the use of urban parks by Latino residents
Perceived safety has long been known to play an important role in people’s use of urban parks, but little is known about how the everyday leisure behavior of neighborhood residents is altered by the presence of gang activity. NRS scientist Paul Gobster examined how the perceptions of Latino residents in two inner- city Chicago neighborhoods affected their use of outdoor recreation environments and how they responded.
Residents reported a near-constant gang presence in and around the neighborhood parks studied, and drug-related activity made it particularly unsafe for residents and their children to access and use parks. Residents employed a number of strategies to cope with gang problems, including avoiding parks and neighborhood locations or altering their times of use, adopting protective behaviors such as using parks in large groups and/or under the presence of police, and devising collective behaviors such as organizing neighborhood crime watch programs, park clean-up activities, and supervised youth programs. Understanding these strategies is particularly important in inner-city and low-income communities where park space is often already at a minimum and residents have limited alternatives.
Kimberly Shinew and Monika Stodolska, University of Illinois at Urbana--Champaign
2009 Research Highlights
The Northern Research Station (NRS) published the proceedings of a conference titled Restorative Commons: Creating Health and Well-being through Urban Landscapes. Participants at the 2007 conference shared lessons learned from the fields of urban natural resource management and design with other practitioners, policymakers, and the general public.
- Meristem, New York, NY
Urban tree canopy: The development of prioritization tools
Scientists from the Northern Research Station, the University of Vermont (UVM) Spatial Analysis Laboratory, and other partners have developed tools for the high resolution assessment of urban landcover. These tools have been applied to a range of cities, including Burlington, VT; Boston, MA; New York City; and Baltimore and Cumberland, MD. Based upon these assessments, these cities have established urban tree canopy (UTC) goals and allocated resources to meet these goals.
- Austin Troy, Dexter Locke, Kelly Ann Goonan, Michele Romolini, University of Vermont
- Jacqueline Lu, Jessie Braden, and Fiona Watt, Department of Parks & Recreation, New York City
Protecting habitat for grassland birds also improves life for people
More than 80 percent of the U.S. population lives in urban areas, and these areas are experiencing rapid growth and largescale development of open space. Many residents are concerned about the loss of open spaces and the amenities they provide, and many local organizations, including local governments, have policies and funds to acquire land or conservation easements within or on the fringe of metropolitan areas.
- University of Washington
- University of Illinois
- Kane County (IL) Forest Preserve District
Listening to neglected voices
Natural resource managers need to understand the cultures and concerns of ethnic minority communities to serve them effectively. The Hmong people from Southeast Asia came to the U.S. as refugees after the Vietnam War.
- Michele Schermann, MaiKia Moua, and Tou Thai Lee, University of Minnesota
Tree biology education for landscape professionals
Urban and community forests need arborists and other landscape professionals who understand the relationship of tree biology and the environment.
- International Society of Arboriculture
- Ecological Landscaping Association
- American Nurseryman
- and others
2008 Research Highlights
Fight crime: Plant a tree
Trees and green space have always been prized in urban settings for their aesthetic value. But their stock might go up after a recent study suggests vegetation management might also affect crime rates.
But even more significant than the type of vegetation was its management. Regardless of a neighborhood’s income or education level, lower crime rates were associated with vegetated areas with higher levels of management and care. All these results suggest the importance of natural resource agencies, police and community development organizations to work together to make cities healthier and safer places to live. More>>
- Austin Troy and Ashley Lidman, Rubenstein School of the Environment and Natural Resources
2007 Research Highlights
Tree software benefits cities and their trees
NRS staff completed analyses of urban forest structure and ecosystem services and their values for seven U.S. cities and four cities in Italy. Using the Urban Forest Effects (UFORE) model, these cities were able to quantify the value of their existing forest cover and identify the potential for increasing canopy cover and value to the city.
- Davey Tree Expert Company
- National Arbor Day Foundation
- Society of Municipal Arborists
- International Society of Arboriculture
Living Memorials Project honored
The NRS’s Living Memorials Project received top honors from the Environmental Design Research Foundation and Places Journal and from the Voices of September 11th organization this year for its documentation of the spaces people create or use as they shape the landscape to memorialize individuals, places, and events.
- Parsons The New School for Design and Tishman Environment and Design Center
- National Park Service
- Federal Hall National Memorial
Wildland-urban interface maps aid fire planning
The 2007 southern California wildfires generated demand for the detailed maps of the wildland-urban interface (WUI) generated by NRS scientists and collaborators. California land managers and policymakers used the spatial detail of the maps in their efforts to protect 5.1 million WUI housing units (the nation’s highest number).
- Oregon State University
- University of Wisconsin-Madison