Key Functions
  • Maintains a Provincial Range Reference Area program.
  • Determines plant community composition and productivity on Crown rangelands.
  • Provides advice to districts on plant community response to grazing and other disturbance.
 

Ecology

Range Reference Areas of British Columbia

What are Range Reference Areas?

Range Reference Areas are permanent installations which monitor the impact of livestock, wildlife and other disturbances on British Columbia rangelands. Reference Areas include permanent vegetation sampling plots that have never been grazed as well as abandoned grazing areas and relic sites. Fenced exclosures, which protect vegetation from grazing and browsing, are monitored.

range exclosure

Why Range Reference Areas are Important

Long-term maintenance and monitoring of Range Reference Areas provide a consistent, continuing benchmark for evaluating the accuracy of potential natural (climax) communities (PNC) estimates.

Information from Range Reference Areas is used to measure the desired effect of range management practices and contributes to the development of Range Use Plans. As our knowledge of the PNC for a given range type is improved, the desired plant community targets set out in Range Use Plans can be adjusted.

Range Reference Areas on sites which have reached PNC are valuable to land managers because:

  • They provide solid evidence of the climax species composition on grassland and forested range types from similar site conditions (assuming the comparison is not invalidated by a history of irreversible impacts); and,
  • They are subject to the same year-to-year climatic fluctuations as adjacent managed grasslands thus allowing for direct comparisons of change over time.

In range ecosystems where no examples of PNC remain, Range Reference Areas are established in the most advanced seral (successional) stage available. These sites may typically require 5 to 15 years to reach PNC. In areas where only early-seral grasslands exist, Range Reference Areas may require up to 70 years or longer to reach PNC.

Range Reference Areas in seral communities can be used to validate estimates of PNC by:

  • Excluding grazing to allow full expression of the existing plant community in growing seasons following Range Reference Area establishment; and,
  • Allowing range managers to improve PNC estimates through repeated monitoring as the seral community moves toward climax (PNC).

 

Where are Range Reference Areas Established?

There are over 360 Range Reference Areas in British Columbia in both open and forested range environments. The majority are found in the Cariboo-Chilcotin and Kamloops area where permanent rangelands comprise a larger portion of the total land area.

For More Information

For further information - contact one of the following Range Ecology Specialists:

  • Francis Njenga (Kamloops): 250-371-3828
  • Nick Hamilton (Prince George): 250-614-7526