NCASI publishes results of herbicide measurements at Alsea Watershed Study

The Alsea Watershed Study Revisited is part of the Watersheds Research Cooperative (WRC; at Oregon State University. One component of the study is characterizing potential effects on aquatic ecosystems resulting from the use of herbicides to facilitate tree regeneration in a timber harvest unit in the Alsea’s Needle Branch drainage. As part of this effort, the analytical laboratory at NCASI’s West Coast Regional Center was tasked with measuring concentrations of multiple herbicides in samples collected from Needle Branch by WRC researchers affiliated with Oregon State University.

Analytical methods and results are presented in NCASI Special Report No. 13-01, Measurement of Glyphosate, Imazapyr, Sulfometuron Methyl, and Metsulfuron Methyl in Needle Branch Streamwater. Results show that concentrations of herbicides found in streamwater were low (<1 ppb) and that peak concentrations during post-application storm events were short-lived (<12 h). These results are consistent with earlier results from the Alto Watershed Study in Texas and generally confirm the effectiveness of Best Management Practices in minimizing ecological risks associated with silvicultural uses of herbicides.


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