Understanding Woody Plant Encroachment as a Coupled Human and Natural System

Tuesday, August 12, 2014: 8:00 AM-11:30 AM
204, Sacramento Convention Center
Michael G. Sorice, Virginia Tech
Chris B. Zou, Oklahoma State University; and Bradford Wilcox, Texas A& M University
Chris B. Zou, Oklahoma State University
After centuries existing as grasslands rangeland systems worldwide have been transforming into woodlands and shrublands. This phenomenon, known as woody plant encroachment (WPE), is especially prevalent in the Southern Great Plains of the United States where it is estimated to be 5 to 7 times greater than in other regions of the country. The rapid ecological transition is driven largely by human-related elimination of fire from the system—both because overgrazing has reduced fuel available for fire to propagate and because of active fire suppression the WPE has resulted in significant changes to primary production, trophic structure, biological diversity, and nutrient cycling of rangeland systems. Rangeland systems with high densities of WPE provide fewer ecosystem services including changes in hydrological regimes and forage for livestock. Further, the woody-plant dominated ecosystem state is highly resilient; it is extremely difficult and cost prohibitive to covert established woodlands back to grasslands. This, in turn, has significant social and economic implications and impacts on human well being and highlights the need to understand the social and ecological factors that facilitate or inhibit this widespread environmental change. A new understanding of WPE is needed that treats it as complex social-ecological system that encompasses the interactions of physical, ecological and social systems. This symposium explores the opportunities and challenges of addressing woody plant encroachment as a complex problem with both ecological and social dimensions.
8:00 AM
 The importance of past and recent land use policies in woody plant expansion in Eastern Kansas
John M. Briggs, Kansas State University; John Harrington Jr., Kansas State University; John M. Blair, Kansas State University
8:40 AM
 Global crowdsourcing of soil-specific woody plant encroachment patterns and management strategies
Jeffrey E. Herrick, USDA Agricultural Research Service; Adam Beh, USDA-ARS Research Unit at the Jornada; Josh Beniston, USDA-ARS Research Unit at the Jornada; Kevin Urama, Africa Technology Policy Studies Network; Cornelis Van der Waal, Vanderwaal & Associates Agri-ecological Services
9:40 AM
10:10 AM
 Encroachment of Juniperus species as a socio-ecological problem on private rangelands
Samuel D. Fuhlendorf, Oklahoma State University; Sherry A. Leis, Missouri State University; John Weir, Oklahoma State University
10:30 AM
 Prescribed burn associations and ecosystem restoration through the application of periodic fire at landscape scales
Urs Kreuter, Texas A&M University; Carissa L. Wonkka, Texas A&M University; David Toledo, USDA Agricultural Research Service