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Featured researches published by John D. Waldron.


Landscape Ecology | 2008

Simulating the reciprocal interaction of forest landscape structure and southern pine beetle herbivory using LANDIS

David M. Cairns; Charles W. Lafon; John D. Waldron; Maria D. Tchakerian; Robert N. Coulson; Kier D. Klepzig; Andrew G. Birt; Weimin Xi

The reciprocal interaction of landscape structure and ecological processes is a cornerstone of modern landscape ecology. We use a simulation model to show how landscape structure and herbivory interact to influence outbreaks of southern pine beetle (Dendroctonus frontalis Zimmermann) in a landscape representative of the southern Appalachian Mountains, USA. We use LANDIS and its biological disturbance agent module to simulate the effects of landscape composition (proportion of landscape in host area) and host aggregation on the size and severity of insect outbreaks and the persistence of the host species, Table Mountain Pine (Pinus pungens Lamb.). We find that landscape composition is less important in the modeled landscapes than host aggregation in structuring the severity of insect outbreaks. Also, simulated southern pine beetle outbreaks over time tend to decrease the aggregation of host species on the landscape by fragmenting large patches into smaller ones, thereby reducing the severity of future outbreaks. Persistence of Table Mountain pine decreases throughout all simulations regardless of landscape structure. The results of this study indicate that when considering alternative restoration strategies for insect-affected landscapes, it is necessary to consider the patterns of hosts on the landscape as well as the landscape composition.


Archive | 2012

Restoration of Southern Pine Forests After the Southern Pine Beetle

Weimin Xi; John D. Waldron; David M. Cairns; Charles W. Lafon; Andrew G. Birt; Maria D. Tchakerian; Kier D. Klepzig; Robert N. Coulson

The southern pine beetle (Dendroctonus frontalis Zimmermann) is the most destructive insect pest of pine (Pinus spp.) forests in the southern United States. Restoring and managing pine stands infested by southern pine beetle are critically important for forest health and sustainability in the region. The successful restoration of damaged pine forests requires the integration of information of beetle biology and behavior, pine ecology, and landscape restoration. Certain social, economic, and political issues also need to be considered concomitantly. The knowledge for effective restoration and management of southern pine forests has increased greatly in the past decade. In this chapter, we provide a synthesis of new and existing knowledge to address the goals, framework, implementation, social and political impacts on the restoration of the southern pine forests in the context of southern pine beetle. We also provide information on common restoration methods and cost estimates. More effective use and further development of such knowledge could substantially reduce the economic, ecological, and social impact of southern pine beetle within the southern United States and adjacent areas.


Restoration Ecology | 2007

Modeling the Effects of Fire on the Long-Term Dynamics and Restoration of Yellow Pine and Oak Forests in the Southern Appalachian Mountains

Charles W. Lafon; John D. Waldron; David M. Cairns; Maria D. Tchakerian; Robert N. Coulson; Kier D. Klepzig


Acta Ecologica Sinica | 2009

Review of forest landscape models: Types, methods, development and applications

Weimin Xi; Robert N. Coulson; Andrew G. Birt; Zong-Bo Shang; John D. Waldron; Charles W. Lafon; David M. Cairns; Maria D. Tchakerian; Kier D. Klepzig


Journal of Forestry | 2008

Landscape Modeling for Forest Restoration Planning and Assessment: Lessons from the Southern Appalachian Mountains

Weimin Xi; Robert N. Coulson; John D. Waldron; Maria D. Tchakerian; Charles W. Lafon; David M. Cairns; Andrew G. Birt; Kier D. Klepzig


Applied Vegetation Science | 2007

Simulating the impacts of southern pine beetle and fire on the dynamics of xerophytic pine landscapes in the southern Appalachians

John D. Waldron; Charles W. Lafon; Robert N. Coulson; David M. Cairns; Maria D. Tchakerian; Andrew G. Birt; Kier D. Klepzig


Geography Compass | 2008

Simulation Modeling as a Tool for Understanding the Landscape Ecology of Southern Pine Beetle Infestations in Southern Appalachian Forests

David M. Cairns; Charles W. Lafon; Andrew G. Birt; John D. Waldron; Maria D. Tchakerian; Robert N. Coulson; Weimin Xi; Kier D. Klepzig


Ecological Restoration | 2009

Modeling long-term effects of altered fire regimes following Southern Pine Beetle outbreaks (North Carolina).

Weimin Xi; John D. Waldron; Charles W. Lafon; David M. Cairns; Andrew G. Birt; Maria D. Tchakerian; Robert N. Coulson; Kier D. Klepzig


Open Journal of Forestry | 2014

Evaluating Southern Appalachian Forest Dynamics without Eastern Hemlock: Consequences of Herbivory by the Hemlock Woolly Adelgid

Andrew G. Birt; Yu Zeng; Maria D. Tchakerian; Robert N. Coulson; Charles W. Lafon; David M. Cairns; John D. Waldron; Weimin Xi; Szu-Hung Chen; Douglas A. Street


Tree and Forestry Science and Biotechnology 6(Special Issue 1):22-26 | 2012

Impacts of hemlock decline and ecological considerations for hemlock stand restoration following hemlock woolly adelgid outbreaks

Sarah Z. Jonas; Weimin Xi; John D. Waldron; Robert N. Coulson

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Kier D. Klepzig

United States Forest Service

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Sarah Z. Jonas

University of West Florida

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