STAND DESCRIPTION
- Plot Name: Reference Stand 38 (HJA Lookout Cr. Riparian)
- Plot Size: 2.44 ha
- Established: 1990
- Remeasurements: 1996
- Site Description
- Latitude: 44.23
- Longitude: 122.22
- Elevation: 500 m
- Aspect: variable
- Slope: 0 to 60%
- Landform: Plot straddles main stem of Lookout Creek with most
of the plot north of the channel. This portion is largely
made up of floodplain and terraces. To the south of the
channel the main landform is a steep toe-slope.
- Soil Parent Material: recent alluvium and mixed colluvium.
- Soil(s): Unknown
- Plant Association: Several communities are present, ranging
from upland western hemlock to riparian red alder.
- Age Class: variable
Soils:
- No description currently available.
General Stand Description:
Reference Stand 38 was established to study riparian
stands along the main stem of Lookout Creek (located just
south of the Concrete Bridge in the H.J. Andrews Exp. For.).
At this location Lookout Creek occupies a fairly broad flood
plain. The flood event of 1996 resulted in blockage of the
main channel and consequent establishment of a new, secondary
channel.
The vegetation is variable over the plot and
unforunately the understory has not been quantitatively
described. To the south of the main channel on a steep toe-slope
there is a stand of mature Tsuga heterophylla and Thuja
plicata. Here the understory is dominated by Acer
circinatum, Berberis nervosa, and Gaultheria shallon. Along
the stream channels the vegetation is dominated by Alnus
rubra and significant amounts of Acer macrophyllum, with an
understory of Rubus spectabilis and Polystichum munitum. On
gently sloping terrace and flood plain surfaces the overstory
tends to be a rather scattered mixed stand of Tsuga
heterophylla, Pseudotsuga menziesii, and Thuja plicata. The
understory is variable with species such as Oxalis oregana
and Vaccinium parvifolium being especially common.
- Stand Structure and Composition
- Live Tree Data at Last Measurement
- Basal area: 57.6 m2/ha
- PSME-18.7 m2/ha
- THPL-15.9 m2/ha
- TSHE-10.6 m2/ha
- ALRU-5.1 m2/ha
- ACMA-4.1 l m2/ha
- Stem numbers: 562/ha
- ALRU-257/ha
- TSHE-110/ha
- TABR-74/ha
- ACMA-54/ha
- THPL-42/ha
- PSME-10/ha
- Diameter distribution:
- median-13.7 cm
- quadratic mean-36.1 cm
- maximum-211.5 cm
- Age: not available
- Height (measurements within the last 20 years):
- ALRU Ave.=19.0 m (n=29, quadratic mean diam.=29.4 cm), Max.=29.6 m.
- Volume: 927.1 m3/ha
- PSME-382.4 m3/ha
- THPL-244.4 m3/ha
- TSHE-167.9 m3/ha
- ACMA-53.5 m3/ha
- ALRU-45.3 m3/ha
- TABR-23.6 m3/ha
- Biomass: 449.1 Mg/ha
- PSME-221.0 Mg/ha
- THPL-81.0 Mg/ha
- TSHE-78.5 Mg/ha
- ACMA-27.2 Mg/ha
- ALRU-19.8 Mg/ha
- TABR-16.0 Mg/ha
- Coarse Woody Debris: not available
- Ecosystem and Population Dynamics (measurements for most recent
interval, 1990-1996)
- Net Bole Production: 4.0 Mg/ha/yr
- Annual Mortality: 5.5 Mg/ha/yr
- Percent of Trees Dying: Total-3.5%/yr (12.1% were uprooted)