Search

This report provides an overview of expected housing density changes and related impacts to private forests on America's islands in the Pacific and Caribbean, specifically Hawaii, Guam, American Samoa, the Commonwealth of the Northern Mariana Islands, Puerto Rico, and the U.S. Virgin Islands. We discuss the vulnerability of island forests to conversion for housing development, introduction and spread of invasive species, and risk of uncharacteristic wildfire, among other concerns. Our maps and projections suggest that in localized areas from 3 to 25 percent of private forest land is likely to experience a substantial increase in housing density from 2000 to 2030. Resource managers, developers, community leaders, and landowners should consider the impacts of housing development and invasive species on ecosystem services in coming decades.

Close to 80 percent of the U.S. population lives in urban areas and depends on the essential ecological, economic, and social benefits provided by urban trees and forests. However, the distribution of urban tree cover and the benefits of urban forests vary across the United States, as do the challenges of sustaining this important resource. As urban areas expand across the country, the importance of the benefits that urban forests provide, as well as the challenges to their conservation and maintenance, will increase. The purpose of this report is to provide an overview of the current status and benefits of America's urban forests, compare differences in urban forest canopy cover among regions, and discuss challenges facing urban forests and their implications for urban forest management.

Over half (56 percent) of America’s forests are privately owned and managed and provide a vast array of public goods and services, such as clean water, timber, wildlife habitat, and recreational opportunities. These important public benefits are being affected by increased housing density in urban as well as rural areas across the country. The Forests on the Edge project, sponsored by the U.S. Department of Agriculture, Forest Service, seeks to improve our understanding of where across the country housing density increases, as well as other threats, might affect these critical goods and services. For this study, we map and rank watersheds across the conterminous United States to analyze the relative contributions of private forest land to water quality, timber volume, at-risk species habitat, and interior forest. In addition, we rank watersheds according to the pressures on private forest contributions from increased housing density, wildfire, insect pests and diseases, and air pollution. Results indicate that private forest land contributions to forest cover, clean water, and timber volume are greatest in the East, but are also important in many Western watersheds. Private forests making substantial contributions to interior forest and at-risk species are more uniformly distributed across the country. Development pressures on these contributions are concentrated in the Eastern United States but are also found in the north-central region, parts of the West and Southwest, and the Pacific Northwest; nationwide, more than 57 million acres of rural forest land are projected to experience a substantial increase in housing density from 2000 to 2030. Private forests in both the Eastern and Western United States are under pressure from insect pests and diseases. The bulk of private forests most susceptible to wildfire are located in the West and parts of the Southeast. Lastly, ozone pollution affecting private forests is localized in California and several areas of the East.

Many of America’s national forests and grasslands—collectively called the National Forest System—face increased risks and alterations from escalating housing development on private rural lands along their boundaries. National forests and grasslands provide critical social, ecological, and economic benefits to the American public. This study projects future housing density increases on private rural lands at three distances—2, 3, and 10 miles—from the external boundaries of all national forests and grasslands across the conterminous United States. Some 21.7 million acres of rural private lands (about 8 percent of all private lands) located within 10 miles of the National Forest System boundaries are projected to undergo increases in housing density by 2030. Nine national forests are projected to experience increased housing density on at least 25 percent of adjacent private lands at one or more of the distances considered. Thirteen national forests and grasslands are each projected to have more than a half-million acres of adjacent private rural lands experience increased housing density. Such development and accompanying landscape fragmentation pose substantial challenges for the management and conservation of the ecosystem services and amenity resources of National Forest System lands, including access by the public. Research such as this can help planners, managers, and communities consider the impacts of local land use decisions.