Valuation of continuous and intermittent<Emphasis Type="Italic">Phragmites</Emphasis> control |
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| Authors: | Email author" target="_blank">R?E?TurnerEmail author R?S?Warren |
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| Institution: | 1.Coastal Ecology Institute,Louisiana State University,Baton Rouge;2.Connecticut College,New London |
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| Abstract: | Quantifying the relative value ofPhragmites australis andSpartina alterniflora habitat is important to evaluate the benefits and risks of different attempts to addressPhragmites expansion on the U.S. eastern seaboard. Two contrasting approaches commonly used to restore tidal marsh habitats invaded
byPhragmites communities involve sprayingPhragmites with herbicide only when its coverage of a particular marsh area is near or close to 100%. Alternatively, after the first
application, herbicide is annually applied on any surviving patches ofPhragmites present in a mosaic of other marsh vegetation. A model is introduced to evaluate the relative habitat value of these control
regimes, here termed the Intermittent and Continuous. Compared to the Intermittent approach, the area of herbicide application
in the Continuous approach is higher in the first 6 yr, but lower the reafter. The cumulative gain in habitat quality after
20 yr in either approach is sensitive to the presumed relative values ofPhragmites versusSpartina habitat, and may even be negative if they are nearly equal. Annual applications of herbicide to patches ofPhragmites appears to generate more habitat value and with less herbicide than occasional applications whenPhragmites cover is at is maximum. |
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