From
http://www.cnr.umn.edu/FR/extension/urbanforestry/whatisurbanforestry.htm - University of Minnesota Extension Service
What is Urban Forestry?
The urban forest includes all of the natural resources in an urban area - plants, soil, water, animals - and is often referred to as the "green infrastructure" of a community. Any residential, commercial or institutional community that has public services - streets, curbs, utilities - is considered an urban area, in contrast to a rural area.
Urban forestry is the management of urban forests in a manner that maximizes the benefits of the natural resources to people without compromising the health and condition of those resources.
There may be many personal benefits associated with urban forests but the most universal include property values, quality of life, recreation, soil/water/air quality, energy conservation, and societal benefits.
Community forestry refers more specifically to the societal benefits of urban forests; community pride, the social aspects of community planting and care projects, reduction of violent crimes and a sense of safety.
Urban and Community forestry includes two main avenues of management: Urban Forest Health (e.g., best planting practices, disease and insect pest management, tree preservation) and the Societal Benefits (e.g., natural resources education, urban forest design, recreational opportunities).