Long-Term Ecological Research (LTER)/AND006: H.J. Andrews WS 1, 2, and 3 and Miscellaneous Suspended Sediment Grab Samples

LTER - Long-Term Ecological Research Program/H.J. Andrews Forest (AND)

LTER/AND006 [Summary adapted from the LTER Core Data Set Catalog]:

The objective of this study was to quantify the long-term effects of
two intensities of timber harvest on sediment delivery at seasonal and
yearly time scales. A paired watershed approach was used to compare
differences in total sediment flux over a 30-year period. The three
small forested catchments (WS 1, 2, and 3) in this study are located
in the H.J. Andrews Experimental Forest in the Western Cascade range
of Oregon, a steeply dissected landscape underlain by mixed volcanic
rocks and vegetated with 400- to 500-year-old stands of Douglas fir
and hemlock. Sampling of suspended and bedload sediment was initiated
in 1957 and continued through 1988 on all three watersheds which have
drainage areas of 96, 60, and 10 ha respectively. Three different
treatments were compared: a 100% clearcut watershed without roads
completed in 1966 (WS 1), a 25% harvested patch-cut watershed with 6%
of area in roads completed in 1963 (WS 3), and a forested control
(WS2). Vertically integrated, suspended sediment grab samples were
taken in pint milk bottles from the head end of each flume during and
between storms. Samples are taken at as near the same time as
possible at each watershed, with samples taken on rising leg, peak,
and falling leg, where possible. Sediment was measured by EPA and OSU
labs prior to 1963. From Water Year 1963 through 1976, sediment
quantity and concentrations were measured with the Gooch crucible
filtration technique. In November, 1977, sediment measurements were
moved to Corvallis FSL (CCAL) and the method changed to a larger GF/C
filter paper. On November 23, 1983, this was changed to a GF/F filter
paper. All samples are screened before filtering, removing bedload
sediment (greater than 2 mm).

The Andrews Forest is in the western Cascade Range of Oregon in the
15,800-acre drainage basin of the Lookout Creek, a tributary of Blue
River and the McKenzie River. The area elevation ranges from 1350
feet to 5340 feet and contains excellent examples of Pacific Northwest
conifer forests, wildlife, and ecosystems.

Information about the Long-Term Ecological Research (LTER) Program can
be obtained from:

LTER Network Office
College of Forest Resources AR-10
University of Washington
Seattle, WA 98195
Phone: [phone]
FAX: [phone]
Email: [e-mail]
"http://lternet.edu"

or

National Science Foundation
Division of Environmental Biology
Long-Term Projects in Environmental Biology
Phone: [phone]
Email: [e-mail]