Scientist names top 5 invasive plants threatening Southern forests in 2009

Jan 12, 2009

U.S. Forest Service Southern Research Station (SRS) Ecologist Jim Miller, Ph.D., one of the foremost authorities on nonnative plants in the South, today identified the invasive plant species he believes pose the biggest threats to southern forest ecosystems in 2009.

"Cogongrass, tallowtree, and Japanese climbing fern are among the fastest moving and most destructive nonnative plant species facing many southern landowners this year," said Miller. "Rounding out the top five invasive species that I'm very concerned about would be tree-of-heaven and nonnative privets. While our forests are besieged by numerous invasive plants, these and other nonnative species present serious financial and ecological threats to the South and its forests in 2009."

Nonnative species often out-compete native forest plants and may degrade forest productivity, wildlife habitat, recreational values, and water quality. Invasive species also greatly increase expenses as public and private land managers work to combat their spread and deal with their effects (such as increased wildfire risk and severity).

Nonnative plants can be introduced and spread by wildlife or through other natural means. Humans also spread invasive species by planting them in their gardens and yards and by seeds hitchhiking on their clothes. Additionally, tractors and mowers used in multiple locations without being cleaned often spread nonnative plants.

In an effort to inform forest managers, landowners, and others about where the most threatening invasive plants are in the South and to help them prepare for these threats, Miller collaborated with SRS Forest Inventory and Analysis (FIA) scientists to develop maps showing the spread, county-by-county, across the Southeast of more than 30 of the most serious nonnative plant species. The invasive plant data were collected on FIA plots throughout the southern United States in cooperation with State forestry agencies. In partnership with the University of Georgia's Center for Invasive Species Science and Ecosystem Health, SRS researchers recently posted the maps and occupation levels online.

Maps posted at www.invasive.org/fiamaps/acres.cfm show the number of acres in a county covered by each nonnative species. Maps posted online at www.invasive.org/fiamaps/percent.cfm show the percent of subplots analyzed in a county that have each invasive species. A spreadsheet found at www.invasive.org/fiamaps/summary.pdf shows the total acreage of 33 invasive plant species in 12 Southeastern States (data for eastern Oklahoma is missing as SRS FIA just completed this part of the State's inventory this month). Users can access the maps and spreadsheet via www.invasive.org/fiamaps/ . Current plans are for researchers to update the information annually.

Miller hopes government agencies, forest managers, natural resource professionals, landowners, students, and others will use the information to help combat the spread of nonnative plant species in southern forest and grassland ecosystems.

Details on the five invasive plants mentioned above can be found online via: www.srs.fs.usda.gov/pubs/gtr/gtr_srs062/ .

Source: USDA Forest Service

Explore further: Heat waves becoming more prominent in urban areas, research reveals

add to favorites email to friend print save as pdf

Related Stories

Stepping stones to NASA's human missions beyond

Jan 21, 2015

"That's one small step for (a) man; one giant leap for mankind." When Neil Armstrong took his first steps on the moon, many strides came before to achieve that moment in history. The same is true for a human ...

Helping native birds beat their bullies

Dec 30, 2014

Small Australian native birds are losing food and home to a growing flock of rivals, including native birds arriving from other states, invasive alien birds and those that thrive in urban areas, environmental scientists have ...

Recommended for you

Measuring phosphorus loss from Midwest crop fields

20 hours ago

Field runoff from farms in the Lake Erie basin is often rich in soluble plant nutrients, including phosphorus. When this nutrient-rich runoff reaches the lake, the phosphorus can support abundant algal blooms ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.