MAPPING BRAZILIAN PEPPER INFESTATIONS IN SOUTH TEXAS WITH SPATIAL INFORMATION TECHNOLOGIES

摘要

Brazilian pepper (Schinus terebinthifolius), an evergreen shrub or tree indigenous to Brazil, Paraguay, and Argentina, was introduced into the United States as an ornamental. This plant has an aggressive growth habit that allows it to establish, spread, and displace native vegetation, resulting in a monoculture of Brazilian pepper. It is included on the invasive and noxious weed lists of several states, including Texas. In this study, we used spatial information technologies to map and assess Brazilian pepper infestations in south Texas. Using commercial geographic information system (GIS) software and coordinates of infested sites obtained with global positioning systems, we developed a database and a distribution map showing the locations of Brazilian pepper infestations in south Texas counties. We used digitized color infrared aerial photography subjected to a computerized classification algorithm to develop a map and to assess a Brazilian pepper infestation at a study site located in Cameron County, Texas. Employing the thematic map derived from the aerial photograph of the study site and soil data (Soil Survey Geographic Database) as layers in the GIS, we determined the soil attributes associated with the Brazilian pepper plants mapped at the study site. The overall results suggest that natural resource managers can use spatial information technologies as tools for mapping and assessing Brazilian pepper infestations in south Texas. They can employ the information obtained from these technologies to assist them in implementing management plans designed to control this invasive plant.