Investigations of Aquatic Weed Control Methods and Their Environmental Effects on Nontarget Aquatic Species.

摘要

Laboratory and field studies on submersed aquatic weed and attached algae control methods are reported. Diatom and macroinvertebrate animal populations were sampled in four irrigation canals to determine effects of herbicide-algaecide treatments on nontarget organisms. Two canals were untreated and two treated with copper sulfate or xylene herbicides. Water quality,standing crop biomass,and adenosine triphosphate (ATP) levels in organisms were collected along with biological data. Biological samples were identified to determine taxa and community structure. Population data were used to calculate species diversity indices using information theory equations. Results show few statistical significant differences between treated and untreated canals. Canal water return flows were similar to populations occurring in receiving streams. Conclusions support hypotheses that taxa diversity of these organisms can be used to indicate ecological conditions of aquatic canal and river habitats. One experimental herbicide and a chlorinated solvent were herbicidal on pondweeds. Three proprietary soluble copper compounds were mixed with diquat to determine herbicidal characteristics. Slight activity increases were noted over diquat alone.