STAND DESCRIPTION

Plot Name: Reference Stand 32 (HJA)
Plot Size: 0.25 ha
Established: 1978
Remeasurements: 1983, 1988, 1994
Site Description
Latitude: 44.24
Longitude: 122.19
Elevation: 650 m
Aspect: S-SW
Slope: gentle to steep
Landform: gentle concave sideslope and convex steep sideslope separated by a subridge
Soil Parent Material: colluvium and residuum from altered volcanoclastic rocks (Little Butte Formation)
Soil(s): shallow on ridge and 1-2 m deep on bench and sideslopes
Plant Association: Tsuga heterophylla/Rhododendron macrophyllum/Berberis nervosa
Age Class: largely second-growth

Soils:

No detailed soil profile descriptions are available at the present time.

General Stand Description:

The tree layer is composed of a primary layer of dense even-aged second-growth (about 145 years-old) Pseudotsuga menziesii with only a few scattered old-growth trees of the same species. The secondary tree layer is composed of multiple age- and size-classes of Tsuga heterophylla and Thuja plicata. The climax tree species of the area is Tsuga heterophylla with Thuja plicata probably a co-climax species of less importance.
The tall shrub layer is dominated by dense patches of Rhododendron macrophyllum and more scattered stems of Acer circinatum. Berberis nervosa and Gaultheria shallon are dominants of the low shrubs and have very dense cover. Typical of second-growth stands, Cornus nuttallii, Castanopsis chrysophylla, Acer circinatum, and Gaultheria shallon each are more important than they would be in typical climax stands.
The herb layer is well developed and dominated by Linnaea borealis and Chimaphila umbellata. Xerophyllum tenax, Coptis laciniata, Viola sempervirens, and Polystichum munitum are also abundant. Most of the Xerophyllum is restricted to the subridge portion of the stand where soils tend to be shallow and stony.
Stand Structure and Composition
Live Tree Data at Last Measurement (1994)
Coarse Woody Debris: no data available
Ecosystem and Population Dynamics (measurements for most recent interval, 1988-1994)
Net Bole Production: 5.8 Mg/ha/yr
Annual Mortality: 5.2 Mg/ha/yr
Percent of Trees Dying: total-1.6%/yr