Cumulative effects analysis of the water quality risk of herbicides used for site preparation in the Central North Island, New ZealandAuthor(s): Dan Neary; Brenda R. Baillie
Source: Water. 8: 573.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
View PDF (2.0 MB)
Herbicide use varies both spatially and temporally within managed forests. While information exists on the effects of herbicide use on water quality at the site and small catchment scale, little is known about the cumulative effects of herbicide use at the landscape scale. A cumulative effects analysis was conducted in the upper Rangitaiki catchment (118,345 ha) in New Zealand, to determine the risk to water quality from two herbicides commonly used for post-plant weed control: terbuthylazine and hexazinone. Data from a 12.5 ha catchment study within the Rangitaiki Basin, where these herbicides were aerially applied in two consecutive years, were used to model herbicide concentrations entering the Rangitaiki River for the remaining treated areas in the catchment for the same two spray seasons. A spreadsheet model routed herbicide residues from their point of entry into the river to a flow gauge on the Rangitaiki River. Modeling of chemical residue loadings and concentrations of terbuthylazine and hexazinone indicated that potential herbicide residues in stream waters would be mainly below analytical detection limits and pose no risk to the aquatic environment or human health and safety. Safety factors for drinking water quality standards, aquatic organisms, and human Acceptable Daily Intake levels were very large.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
Neary, Daniel G.; Baillie, Brenda R. 2016. Cumulative effects analysis of the water quality risk of herbicides used for site preparation in the Central North Island, New Zealand. Water. 8: 573.
Keywordshexazinone, terbuthylazine, cumulative effects, water quality, New Zealand
- Water quality assessment of bioenergy production
- Sources and Practices Contributing to Soil Contamination
- Psychological safety: The key to high performance in high stress, potentially traumatic environments
XML: View XML