Distribution and Abundance of Nonnative Plant Species at Johnstown Flood National Memorial and Allegheny Portage Railroad National Historic Site

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Overview

The goal of this study was to inventory the nonnative plant populations in each of the four NPS units between 2004 and 2006 at each of the NPS vegetation mapping plots and accuracy assessment points. This report details the results of the inventory for JOFL, which took place in 2004, and ALPO, which took place in 2005-2006. This inventory will contribute to a general understanding of the nonnative plant distributions, identify what species are most prevalent, and determine which vegetation associations are most impacted by nonnative plant species. This report draws attention to survey points and vegetative communities with particularly dense populations of nonnative plants and identifies them as targets for further study and management.