Tree Research

To help local tree advocates make the case for trees in their communities, ACTrees has compiled Benefits of Trees and Urban Forests: A Research List.  This research listing includes over 150 tree benefits and facts, ranging from the national to the hyper-local level, and all with complete scientific citations. This information tells the story of trees in dollars and cents, in pounds and percents, with compelling data about why maintaining and growing a healthy urban forest is a smart, sustainable investment. Learn more.

And check out other current research that may be of interest to those in the urban greening community. For a full list of research, visit the Research Archive.

A Comparison Of Urban And Periurban Forests

Tuscaloosa, AL (June 9, 2016) – Pairing urban forest data from eight cities across the southeastern U.S. with periurban (spaces between the urban and rural interface) forest data shows that tree diversity, as well as both observed and estimated species richness values, were greater in urban forest areas. How does human population effect these forest areas and what does this mean for urban forester planners?

EAB: Saving Trees Early Less Costly Than Replacing Them

West Lafayette, IN (June 20, 2016) – Cities and towns with urban forests, such as parks and streets lined with trees, could spend less money by taking steps to save emerald ash borer-infested trees early rather than wait until they can only replace them, Purdue University researchers concluded in a new study.

Knowledge Co-Production In Urban Research

By Lindsay K. Campbell, Erika S. Svendsen, and Lara A. Roman

Baltimore, MD (June 20, 2016) – Cities are increasingly engaging in sustainability efforts and investment in green infrastructure, including large-scale urban tree planting campaigns. In this context, researchers and practitioners are working jointly to develop applicable knowledge for planning and managing the urban forest. A new paper presents three case studies of this kind of knowledge co-production in urban forestry.

California Street Tree Benefits Valued At $1 Billion

Albany, CA (June 14, 2016) – According to a new report from the U.S. Forest Service’s Pacific Southwest Research Station, the trees lining California’s streets are estimated to provide the state and its citizens with more than $1 billion in benefits. For every $1 spent on planting or maintaining a street tree, that tree returns, on average, $5.82 in benefits.

Urban Parks Build Healthy Cities

Clemson, SC (May 12, 2016) – A new study using the Gallup-Healthways Well-Being Index suggests the path to long-term happiness may lead straight through the closest park. An interdisciplinary team of researchers is using data from Gallup and other sources to explore connections between urban parks, green space and public health.

Six Tree Species And Their Urban Space Requirements

By Jens Dahlhausen, Peter Biber, Thomas Rötzer, Enno Uhl and Hans Pretzsch

Freising, Germany (May 25, 2016) – Urban trees have gained in importance during recent decades, but little is known about the temporal dynamic of tree growth in urban areas. The present study investigated the allometric relationships of stem diameter, tree height, and crown radius for six different tree species in six metropolises worldwide.

Study Offers Guidelines To Help Cities Improve Tree Planting

Gainesville, FL (May 26, 2016) – More than half the world’s people and 80% of the U.S. population live in urban areas. Trees benefit these residents by filtering the air, reducing temperatures and creating healthy landscapes. According to a new study led by Adam Dale, a UF/IFAS assistant professor of entomology, these benefits are reduced when trees are planted in unsuitable urban landscapes, and they lay out guidelines to lead urban tree-planting decisions in a more sustainable direction.

Do Trees Sleep At Night? It Seems So

Masala, Finland (February 29, 2016) – According to new research trees sleep, with branches and leaves drooping at night. For the first time, trees have been shown to undergo physical changes at night that can be likened to sleep, or at least to day-night cycles that have been observed experimentally in smaller plants. what are the implications?

Inventory Data Of California Street Trees Drives Future Priorities

By E. Gregory McPherson, Natalie van Doorn, John de Goede

Davis, CA (April 16, 2016) – A new U.S. Forest Service study compiled recent inventory data from 929,823 street trees in 50 California cities. The research determined trends in tree number and density, identified priority investments and created baseline data against which the efficacy of future practices can be evaluated.

Moss On Urban Trees Helps Identify Pollution Hot Spot

By Yasmeen Sands, U.S. Forest Service

Portland, OR (May 18, 2016) – In December 2013 when Sarah Jovan and Geoffrey Donovan, two scientists with the U.S. Forest Service’s Pacific Northwest Research Station in Portland, Oregon, crisscrossed the northwest area of their city they had no idea they were onto something big. Though their research focus seemed straightforward enough: determine if moss, in particular, the ubiquitous Lyell’s orthotrichum moss which grows abundantly across much of the city, could help measure urban air pollution.