Skip to main content

Chaparral Conversion to Increase Streamflow in Arizona: Sequential Treatments Extend Duration of Nitrate Loss to Stream Water

Buy Article:

$29.50 plus tax (Refund Policy)

Abstract:

Converting an Arizona chaparral watershed to grass cover in two stages by means of herbicide treatments increased stream flow and the concentration of nitrate ions in the stream water. Nitrate rose to remarkably high concentrations (83 ppm) and was exported from the watershed in extraordinary amounts (up to 143 kg/ha/yr) in comparison with a control watershed (1.0 kg/ha/yr). Abnormal concentrations of nitrate in streamflow persisted for more years from the two-stage treated watershed than from a companion watershed converted in one stage. Monthly mean weighted nitrate concentrations fluctuated in an annual cyclic pattern that closely corresponded with major rainfall events and the annual stream discharge cycle, which peaked during the winter rainy season. A possible consequence of such large releases of nitrate ions into stream water is eutrophication of downstream watercourses and reservoirs. In planning for chaparral conversions to enhance water yield, forage production, and wildlife habitat, consideration should be given to the nitrate-release phenomenon associated with conversion to reduce possible adverse environmental impacts. For. Sci. 33(1):89-103.

Keywords: Water yield improvement; brush control; eutrophication; stream water quality

Document Type: Journal Article

Affiliations: Rocky Mountain Forest and Range Experiment Station, USDA Forest Service, Forestry Sciences Laboratory, Tempe, AZ 85287

Publication date: 1987-03-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
  • Submit a Paper
  • Membership Information
  • Author Guidelines
  • Podcasts
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more