Sutherland, Steve, Goins, Robb and Winfield, Jay ([n.d.]), "Monitoring changes in weed populations: post-fire and post-herbicide treatment [abstract]": 1 p..
Abstract:
Weed invasions, especially in their early stages, are often characterized by widely distributed, low-density populations. This makes monitoring changes in weed populations difficult. We will present potential weed monitoring problems and use results for recent studies to illustrate methods to overcome these difficulties. We will show how random and non-random sampling at multiple scales was used to document post-fire weed colonization of previously weed-free areas, weed expansion from source populations into disturbed areas, and fire-induced changes in established weed populations on the Bitterroot National Forest. We will also compare the "cost" and effectiveness of the follow monitoring methods: frequency, percent cover, point intercept, and density in documenting post-fire weed response and herbicide efficacy on the Bitterroot and Helena National Forests. We will also identify pitfalls that were encountered during these studies. |
