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University Gazette

The University of North Carolina at Chapel Hill

Conserving rare plants: It takes an army

Mike Kunz explains how prescribed burns reduce the risk of other, more serious fires and stimulate germination for various plants.

The ground tremored slightly. In the distance, a soft boom echoed through the surrounding forest. “It’s a pretty regular occurrence to hear tanks and large ammunition being fired,” said Mike Kunz, chuckling.

Then, as if on cue, a shadow crept over the research team as a massive C-17 cargo jet momentarily blocked the sun.

“For being as remote as we are,” Kunz added, “there is actually pretty constant noise – you just get used to it after a while.”

Some of the largest reservoirs for biodiversity in the nation reside on more than 37,000 square miles of Department of Defense
land. The military, it turns out, is one of the country’s strongest advocates for wildlife and plant conservation.

Conserving Rare Plants: It Takes an Army from UNC Research on Vimeo.

Kunz, a conservation ecologist with the North Carolina Botanical Garden (NCBG), has spent the past six years working on a rare plant reintroduction program at one of the most populated military bases in the world: Fort Bragg.

“Most people don’t know the military has this strong environmental ethic,” said Johnny Randall, director of conservation programs at the NCBG. “They don’t want to see these species go extinct – and neither do we.”

The North Carolina Botanical Garden has been a leader in native plant conservation and education in the Southeastern United States for more than 40 years. As part of its mission, the garden is committed to conserving biological diversity and participates in university research and teaching.

With the same goals in mind, the garden partnered with the Endangered Species Branch at Fort Bragg and the Army Corps of Engineers in 2011. Together, they propagated and reintroduced the federally endangered rough-leaved loosestrife, as well as the Georgia indigo bush, sandhills milkvetch, and sandhills lily – all “species at risk,” according to the military.

Approximately two-thirds of Fort Bragg’s 500-square-mile installation is training grounds – and maintaining the natural environment is crucial. Remove just one of those endangered or rare plant species from the Sandhills ecosystem – and a ripple effect of unknown size would occur, affecting pollinators, other plants and soil stabilization.

“Even if we don’t know specifically what will happen, we know these plants each play a unique role within the ecosystem,” Kunz said. All of these species are native to the Southeastern United States – some almost exclusively to Fort Bragg. “For example, two-thirds of the known population of Georgia indigo bush occur on the military base,” he said. “So if we lose those resources, we’ve lost the majority of the population in the entire world for that species.”

Flags and fires

Hundreds of blue and red flags stretch across the Fort Bragg forest. These colorful markers show the breadth of this project, each one identifying one plant within the four species studied. Some occur naturally, while others were propagated and reintroduced
by the researchers – thanks to the expertise of the NCBG.

Starting in 2011, between the months of March and October, Kunz made the 1½ hour drive to the base multiple times each week to help take demographic measurements like height and width, stem diameter and the number of flowers and seeds produced on each individual plant. For the reintroduced populations, the research team propagated and out-planted literally thousands of individuals for each of the species, over multiple years. They also took measurements of the natural populations, of which there were also thousands.

The N.C. Botanical Garden and the Army propagated and reintroduced the federally endangered sandhills lily.

Rare plants don’t get a lot of attention, according to Janet Gray, Fort Bragg’s endangered species botanist. “They’re blank slates of information,” she said. “And we’ve gained so much of it that now we know how to perpetuate and maintain these populations. It’s really groundbreaking work.”

One method of preserving these species is prescribed burns. Since the Sandhills experience natural fires every one to three years, the burns prevent more serious fires and stimulate germination for the already fire-adapted ecosystem. “The surrounding longleaf pine and wiregrass depend on it for regeneration,” Kunz explained. “And all of the associated species, although not fire-adapted, benefit from it, too.”

In fact, if it wasn’t for all the routine live ammunition work conducted by the military throughout the year, some of these plant species might have disappeared decades ago.

“Those exercises can actually cause wildfires,” Randall said. “And if those wildfires never occurred, then these plants would have gone extinct a long time ago. It was only within the last 30 years that these species were discovered on base. When botanists and biologists started doing inventory work there, they realized it was a treasure trove of rare plants.”

Protecting the rare plant populations on base not only prevents these species from becoming federally endangered but also helps Fort Bragg maintain its finite training land – so consistent collaboration with multiple environmental agencies such as the Nature Conservancy and the U.S. Fish and
Wildlife Service is key. Today, the base’s conservation efforts are a national model for other military installations – 88 partnerships in 30 states now have federal funding for these types  of projects.

“Fort Bragg has been a really great installation to work with because they have a high level of dedication to conserving their natural areas,” Kunz said. “For someone who was never in the military, it was definitely an eye-opening experience to see all the work our military does.”