Skip to main content
ARS Home » Research » Publications at this Location » Publication #66408
Title: MAPPING LEAFY SPURGE (EUPHORBIA ESULA) INFESTATIONS USING AERIAL PHOTOGRAPHY AND GEOGRAPHIC INFORMATION SYSTEMS

Author
item Anderson, Gerald
item Everitt, James
item Escobar, David
item SPENCER, NEAL - 5432-15-00
item ANDRASCIK, ROGER - USDI,NPS,MEDORA,ND

Submitted to: Geocarto International
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/25/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary: Leafy spurge is a troublesome weed on the northern Great Plains of the United States that is difficult to control. Aerial photography (remote sensing) and computer aided mapping (GIS) have been used to detect and monitor numerous grassland problems. The objectives of this study were to use both tools to map and quantify the amount of leafy spurge within Theodore Roosevelt National Park and to provide information for managing the infestation. Analysis of the data indicated that approximately 1,735 acres of the 46,140 acre park were infested by leafy spurge. Most of the leafy spurge population was restricted to drainage channels, creek bottoms, and river bottoms. Leafy spurge populations were closely associated with water channels, and the size of the population decreased rapidly as the distance from a channel increased. The joint use of GIS and remote sensing technology proved to be a powerful combination of tools which provided previously unavailable information about the amount of area covered and distribution of leafy spurge within the park. The results of this study will contribute to the development of a comprehensive leafy spurge management plan for Theodore Roosevelt National Park.

Technical Abstract: Leafy spurge is a troublesome weed on the northern Great Plains of the United States that chemicals and grazing management have not controlled. Remote sensing and geographic information system (GIS) technology have been used to detect and monitor numerous grassland related problems. The objectives of this study were to use both technologies to map and quantify the extent of leafy spurge within Theodore Roosevelt National Park and to provide information for managing the infestation. Analysis of the data indicated that 702 ha of the 18,680 ha park were infested by leafy spurge; however, leafy spurge populations occurring under dense woody canopies, in deep stream channels, and on steep slopes were not always detected. Infestaions were especially dense in the western and southeastern portions of the park. Most infestations were restricted to riparian zones and smaller drainage channels. Leafy spurge infestations decreased exponentially as distance from stream channels increased (r**2=0.98). The significant association of leafy spurge with drainage channels suggests that the weed might be effectively managed on a watershed sub-basin level. The joint use of GIS and remote sensing proved to be a powerful combination of tools which provided previously unavailable information about the extent and spatial dynamics of leafy spurge within the park. The results of this study will contribute to the development of a comprehensive leafy spurge management plan for Theodore Roosevelt National Park.