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Contact: Wayne Swank
828-524-2128 x100
USDA Forest Service ‑ Southern Research Station

Long-Term Response of a Forest Watershed Ecosystem

Clearcutting in the Southern Appalachians

Otto, NC—A new book edited by U.S. Forest Service emeritus scientist Wayne Swank and Virginia Tech professor Jack Webster and published by Oxford University Press brings together findings from more than 30 years of collaborative research by the Forest Service and the National Science Foundation (NSF) Long Term Ecological Research (LTER) program on the Coweeta Experimental Forest (Coweeta) near Otto, North Carolina.

The research centers on the long-term ecological responses of a southern Appalachian forested watershed following clearcut logging that took place in the 1970s. The 14 chapters by Forest Service and university scientists cover aspects that range from tree regrowth, to stream water quality, to effects on stream macroinvertebrates—each highlighting the importance of long-term data collection and research.

"We're frequently asked, just what is long-term research in forested systems," said Swank. "We consider the minimum window of investigation for forest ecosystems to include the lifespan of the forest of interest, which can easily include several generations of scientists. This book provides a comprehensive update on the long-term study of Coweeta Watershed 7, which so far spans nearly 40 years."

In 1974, then Forest Service scientist Swank and colleagues at the University of Georgia proposed the research to NSF, which funded the study on nutrient cycling from a clearcut cable-logging study on Watershed 7 at Coweeta. The study was incorporated into the newly established NSF LTER program in 1980. The study was unique in that it answered both practical questions related to forest resource management in the southern Appalachians, as well as fundamental hypotheses about hydrologic and ecological processes that were driving the responses. Data and published findings from the study now stretch into decades.

Major findings covered in the book include:

One of the novel features of the research is that it captures watershed responses over a large number of disturbances—not only logging, but also drought, record rainfall, hurricanes, insect outbreaks, and diseases. The research increased awareness about the effects of disturbance on forest ecosystems as well as the need to understand these processes at greater levels of complexity.

"Some forest processes simply cannot be forecast accurately with data from short-term studies," said Swank. "For example, water quality and nutrient responses on Watershed 7 changed with every decade of data. Building models to forecast chemistry, nutrient, and carbon responses using data from the first 5 or 10 years would have given us different answers from what we actually observed in the long-term record. Watershed 7 continues to provide a rare opportunity for researchers."


The book is 253 pages, with 14 chapters by 27 contributors. It can be purchased from Oxford University Press or Amazon.com.

For more information, contact Wayne Swank at wswank@uga.edu.

Headquartered in Asheville, NC, the Southern Research Station comprises more than 120 scientists and several hundred support staff who conduct natural resource research in 20 locations across 13 southern states (Virginia to Texas). The Station's mission is "…to create the science and technology needed to sustain and enhance southern forest ecosystems and the benefits they provide." More information is available at the Southern Research Station page.

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