STAND DESCRIPTION

Plot Name: Reference Stand 33 (HJA)
Plot Size: 0.25 ha
Established: 1978
Remeasurements: 1983, 1988, 1994
Site Description
Latitude: 44.25
Longitude: 122.16
Elevation: 1110 m
Aspect: N
Slope: 45-80%
Landform: steep, smooth side-slope off Roswell Ridge
Soil Parent Material: andesitic basalt (Sardine Formation)
Soil: no classification information available
Plant Association: Tsuga heterophylla-Abies amabilis/ Rhododendron macrophyllum/Berberis nervosa
Age class: Second-growth

Soils:

Soils are generally shallow and stony.

General Stand Description:

This plot is located in an area even-aged second-growth Dougals-fir. The stand is a fairly good represetative of the rather open understory variant of the TSHE-ABAM/RHMA/BENE habitat type in the H.J. Andrews Forest area.
The tree layer is composed of a dense layer of even- aged Pseudotsuga menziesii ranging in age from 135 to 155 years. Near this stand there are several remnants of an older stand. Tree species reproducing in the understory include the primary tree Tsuga heterophylla, the secondary species Abies amabilis and the co-climax Thuja plicata. Scattered individuals of Abies procera and Abies grandis are also present in the stand.
The shrub layer is moderately developed for the open variant of this habitat type. Rhododendron macrophyllum is the dominant tall shrub and Berberis nervosa is the dominant low shrub. Acer circinatum and Pachistima myrsinites are also well represented.
The herb layer is poorly developed as expected under a dense tree canopy. There are large patches of Linnaea borealis scattered among individuals of Polystichum munitum and smaller patches of Viola sempervirens and Whipplea modesta.
Stand Structure and Composition
Live Tree Data at Last Measurement (1994)
Coarse Woody Debris (measured in 1982):
Ecosystem and Population Dynamics (measurements of most recent interval, 1988-1994)
Net bole production: 4.8 Mg/ha/yr
Annual mortality: 0.6 Mg/ha/yr
Percent of trees dying: Total-0.8%/yr