Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects. Page: 105 of 115
117 pagesView a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
3.12 LINE INTERCEPT (OR LINE TRANSECT)
3.12.1 Variables Estimated
Basal or canopy cover of herbs, shrubs, or trees (pp. 5, 7).
3.12.2 Description
In summary, a meter tape is stretched out to form a line i'n the site.
The crew moves along the meter tape and records the measurement at which the
line passes over or under the edges of the individual plants.
A randomly located straight line transect is laid out in the site (see
Appendix A for a discussion of how to establish a random transect and how to
lay it out on the ground). The crew moves along the tape and projects the
plant canopies (or basal areas) vertically to the tape and records the length
of the line segment and the kind of plant involved (Fig. 10). If individual
plants overlap, each is measured separately. When the line passes close to
the intercepted parts of the canopy, it is possible to "eyeball" the vertical
projection from the plant to the line. If the line passe's farther from the
intercepted parts of plants (e.g., tree canopies), it is important to use a
precise method of projecting, such as the Lindsey Sighting Level (p. 35) or
the Vertical Rod (p. 39). After completing the transect, pulling on the end
of the tape should permit one to break or pull out the anchor stick, so the
tape can be rewound.
Calculations are generally as follows for each plant type (X) (e-g.,
plant species) recorded:
EI
C - (100)
where C = cover of x (%)
II. = sum of intercepts with x
e = lengths of the line transect
3.12.3 Accuracy
This technique gives quite accurate results. Accuracy is highest if the
plants measured have the same growth form and similar crown diameters
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Ashley, Paul R. Columbia River Wildlife Mitigation Habitat Evaluation Procedures Report / Scotch Creek Wildlife Area, Berg Brothers, and Douglas County Pygmy Rabbit Projects., report, January 1, 1997; Olympia, Washington. (https://digital.library.unt.edu/ark:/67531/metadc703292/m1/105/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.