Clatsop Plains – Long Beach Peninsula Coastal Prairie Restoration 2015 Report

Executive Summary

In 2015, treatments varied by site and establishment of seeded species was low across sites. Future monitoring will help to elucidate treatment effectiveness and aid in management recommendations.

NCLC Sites

Treatments did reduce cover of both exotic forbs and graminoids, in comparison to control plots. Native species cover was minimal across treatments, due to low establishment of seeded species. Future monitoring is necessary to allow slow growing native seeded species to establish, and to determine the successional trajectory of the individual treatments.

Willapa NWR

Invasive grasses continue to be a management issue at the site. Although the treatments did reduce invasive graminoid cover compared to the controls, all maintained levels that will require intensive management. Future monitoring will provide next steps for management of the pasture grasses at the site.

Yeon (National Park Service)

This site was very different from the other sites. While vegetative cover was low in general at the site, the treatments actually increased the cover of invasive graminoids. Future monitoring will determine the successional trajectory of the site, but currently, none of the treatments offer a practical alternative to the current state of the site. Similar to the other sites, seeded species have been slow to establish and future monitoring will likely find higher cover of native species.