Plant Invasion Patterns at Global and Regional Scales

From the moment of colonization, humans have carried non-native plants around the world with them. “The introductions are changing the world’s biogeography,” says U.S. Forest Service research ecologist Qinfeng Guo. “Understanding the mechanisms behind invasion patterns is critically important.” Invasion patterns vary depending on the scale. At finer scales, invasions are often related to competition.…  More 

30 Years of Nitrogen Fertilization in Spruce-Fir Forest

Rocks and sediments bind up almost 98 percent of all nitrogen. The remaining 2 percent is in motion, part of a global chemical cycle that includes humans, bacteria, plants, and the atmosphere. “Plants need nitrogen to grow,” says U.S. Forest Service research ecologist Steve McNulty. “However, excess nitrogen can harm plants.” Nitrogen and sulfur can…  More 

Drier Weather, Drier Fuels

Dry weather – and huge wildfires – are common. “Climate change would modify fuel moisture and wildland fires dramatically across the United States,” says Yongqiang Liu. Liu is a U.S. Forest Service research meteorologist who recently investigated climate impacts on fuel moisture. His study was published in the journal Ecohydrology. Weather quickly influences fuel moisture…  More 

One is the Deadliest Number

When the redbay ambrosia beetle, native to Asia, was first detected in coastal Georgia in 2002, it didn’t set off any alarm bells. “Ambrosia beetles rarely damage healthy trees, so this find was initially considered unimportant. But the subsequent epidemic of laurel wilt in the Southeast has caused a re-examination of the significance of these…  More 

Eastern Trees Move North & West

After analyzing extensive data collected on 86 tree species in the eastern U.S., researchers found that most trees have been shifting their ranges westward or northward in response to temperature and precipitation changes. Scientists from Purdue University, North Carolina State University, and the U.S. Forest Service collaborated on the study, which was recently published in…  More 

The Most Vulnerable Trees

What do water locust, Texas walnut, chalk maple, pyramid magnolia, two-wing silver bell, and butterbough all have in common? They’re among the U.S. tree species most vulnerable to climate change, according to a study by North Carolina State University (NCSU) and the U.S. Forest Service. The Forest Service Forest Health Protection program sponsored the study,…  More 

Hemlock Seed Banking

Eastern and Carolina hemlock trees in more than 400 counties across 19 states are dead, dying, or threatened by infestation of the invasive hemlock woolly adelgid. As the aphid-like pest continues to spread throughout the ranges of these economically and ecologically important trees, scientists, managers, and other specialists from North Carolina State University’s (NCSU) Camcore…  More 

Southern Pine Beetle Prevention Program

The U.S. Forest Service has teamed up with ESRI to create an exciting new tool for the Southern Pine Beetle (SPB) Prevention Program. This web-based application is called a story map, which is designed for users to navigate through interactive maps accompanied by multimedia content and informative text. The information is provided by the Forest…  More 

Sunlight vs. Hemlock Woolly Adelgids

Scientists have identified a potential new strategy for protecting hemlocks from the miniscule insect that plagues them. “High levels of sunlight help reduce hemlock woolly adelgid abundance on young seedlings,” says U.S. Forest Service project leader Bud Mayfield. “Follow-up experiments in the field are still needed, but the results suggest thinning or strategically creating gaps…  More 

Sap-sucking Bugs Threaten Hemlock Forests

Sap-sucking insects called hemlock woolly adelgids are draining the life from a common evergreen tree in the eastern United States. Since arriving from Japan in the 1950s, the tiny bugs have spread from Georgia to Maine—about half of the Eastern hemlock’s range. Once the bugs become well-established, the consequences can be grave. Areas with severe…  More