White Oak Research at the Northern Research Station

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White oak is a keystone species in eastern U.S. forests, vital for its ecological, economic, and cultural value.

Northern Research Station scientists have decades of experience studying the growth, physiology, and dynamics of white oaks. NRS research investigates the conditions required for successful regeneration, best management practices for sustainable harvesting, and addressing challenges such as climate change, mesophication, and forest health threats.

This Rooted in Research science roundup offers a sample of recent white oak research by NRS scientists.

White Oak Performance Over Forty Years

NRS research scientist Mark Coggeshall and colleagues examined the performance of white oak trees across a range of provenances in a common garden planting over forty years. This article focuses on the species’ response to climate variables, the potential role of assisted migration in forest management, and the importance of considering genetic diversity in white oak conservation and reforestation strategies.

Prescribed Fire Effects on Wood Quality

Some forest managers in the east may avoid using prescribed fire in regenerating oaks due to concerns about fire impact on timber volume or value. However, recent research by NRS scientist Dan Dey and collaborators found that although prescribed fire causes some wounds, only a small percentage of burned oak stands experience a reduction in timber grade - a low price to pay for improved oak regeneration.

Management Guides for Upland Oaks

Oak regeneration experts Dan Dey, Callie Schweitzer, and Stacy Clark co-authored two short silviculture guides, Prescribed Fire for Upland Oaks and Enhancement Planting of Upland Oak Species in collaboration with the White Oak Initiative and the University of Kentucky. The guides synthesize key findings for forest managers from decades of research and field trials.

Genetic Diversity in White Oaks

NRS research plant pathologist Anna Conrad and colleagues screened and validated 16 DNA markers from white oak trees on the Daniel Boone National Forest to study their genetic diversity. These markers showed high genetic variation and provided useful information on the genetic makeup of white oaks in the area.

White Oak Seedlings in Urban Environments

NRS scientists Nancy Falxa Sonti and Richard Hallett worked with colleagues to understand how white oak seedlings were faring in Baltimore. In a journal article, they report that urban soils in their study supported strong growth and better physiological functioning in white oak seedlings compared to reference soils despite having higher levels of heavy metals. However, warmer air temperatures did cause stress and reduced seedling growth.

Private Lands and Oak Sustainability in the Eastern U.S.

Two recent publications by Lauren Pile Knapp and Jacob Fraser and colleagues examine the long-term sustainability of oak populations on managed public and private lands in the eastern U.S. Using the LANDIS PRO forest landscape model, the team analyzed how current and alternative management practices on public and private land could influence the balance of oak and maple species in southeastern Ohio over a 150-year period. A Rooted in Research science brief explores this research.

FIA Tree Damage Data Dashboard, 2015 Five-Year Reports

This dashboard allows users to view and filter USDA Forest Service Forest Inventory & Analysis (FIA) data based on state and tree species - including white oak.

Long-term Effects of Prescribed Burning and Mechanical Thinning on Oak Forests

Oak forests in the east have experienced significant ecological changes over the past century due to fire exclusion and land use changes. Historically, anthropogenic fire regimes maintained oak dominance by reducing competitors like red maple. With the loss of fire across the landscape, these competing species have become more abundant, suppressed oak regeneration, and altered forest structure in a process known as mesophication. In this recent Rooted in Research science brief, Todd Hutchinson and colleagues present 20 years of data collected from the Ohio Hills Fire and Fire Surrogate Study. They found that repeated prescribed fires with or without mechanical treatments were effective in reducing mesophication across upland sites by reducing stand density, creating canopy openings on dry sites, and increasing oak-hickory regeneration and ground layer diversity.