STAND DESCRIPTION
- Plot Name: Reference Stand 37 (Hagan Block Riparian)
- Plot Size: 1 ha
- Established: 1981
- Remeasurements: 1986, 1992
- Site Description
- Latitude: 44.17
- Longitude: 122.43
- Elevation: 475 m
- Aspect: SW and NE
- Slope: 5-70%
- Landform: facing toe-slopes with NW-trending incised stream
channel
- Soil Parent Material: Unknown
- Soil(s): Unknown
- Plant Association: Tsuga heterophylla/Acer circinatum/
Polystichum munitum
- Age Class: Mature
Soils:
- No description currently available.
General Stand Description:
This reference stand was established in order to study
the riparian zone along the S. fork of Hagan Creek. The
stream channel has only very limited terraces and adjoining
toe-slopes are quite steep. Vegetation along the stream
includes red alder (Alnus rubra), big-leaf maple (Acer
macrophyllum), and cascara (Rhamnus purshiana) with abundant
devils club (Oplopanax horridum) in the understory. Upland
slopes, adjacent to the stream, are largely occupied by
mature Douglas-fir (Pseudotsuga menziesii) with a vine maple
(Acer circinatum)/sword fern (Polystichum munitum)
understory. Western hemlock (Tsuga heterophylla) is present,
but in generally small amounts. The most striking feature of
the understory on uplands is the abundance of sword fern.
- Stand Structure and Composition
- Live Tree Data at Last Measurement
- Basal area: 52.3 m2/ha
- PSME-43.6 m2/ha
- ACMA-4.6 m2/ha
- ALRU-3.5 m2/ha
- TSHE-0.4 m2/ha
- RHPU-0.2 m2/ha
- Stem numbers: 224/ha
- PSME-103/ha
- ACMA-46/ha
- ALRU-26/ha
- RHPU-23/ha
- TSHE-15/ha
- Diameter distribution:
- median-40.8 cm
- quadratic mean-54.5 cm
- maximum-156.9 cm
- Age-not available
- Height (measurements within the last 20 years):
PSME ave.=45.6 m (n=12, quadratic mean diameter=69.7 cm), max.=63.0 m
- Volume: 778.5 m3/ha
- PSME-675.3 m3/ha
- ACMA-51.1 m3/ha
- ALRU-46.3 m3/ha
- TSHE-3.5 m3/ha
- RHPU-1.1 m3/ha
- Biomass: 439.4 Mg/ha
- PSME-387.9 Mg/ha
- ACMA-27.4 Mg/ha
- ALRU-21.2 Mg/ha
- TSHE-1.7 Mg/ha
- RHPU-0.4 Mg/ha
- Coarse Woody Debris: not available
- Ecosystem and Population Dynamics (measurements for most recent
interval- 1986-1992)
- Net Bole Production: 5.4 Mg/ha/yr
- Annual Mortality: 0.9 Mg/ha/yr
- Percent of Trees Dying: total-1.4%/yr