FS123
Uneven Aged Management Project (UAMP), Andrews Experimental Forest

CREATOR(S): William H. Emmingham, Gabriel F. Tucker, Paul D. Anderson

PRINCIPAL INVESTIGATOR(S): Paul D. Anderson

ORIGINATOR(S): William H. Emmingham, Gabriel F. Tucker

OTHER RESEARCHER(S): Cheryl Ann Friesen

METADATA CONTACT: Valerie Banner

FORMER INVESTIGATOR: James H. Mayo

DATA SET CREDIT:

USDA Forest Service Willamette National Forest; USDA Forest Service Pacific Northwest Research Station

METADATA CREATION DATE:

28 Aug 2012

MOST RECENT METADATA REVIEW DATE:

14 Feb 2018

KEYWORDS:

habitats, community structure, stand structure, populations, silviculture, ecology, community dynamics, plant cover, community composition, diversity, plant species composition, species richness, trophic structure, spatial variability, temporal variability, user guides, resource management, forest management, survival, disturbance, long term monitoring, thinning, woody debris, coarse woody debris, terrestrial ecosystems, forests, experimental forests, young forests, plants, vascular plants, shrubs, trees, conifers, hardwoods, seedlings, sprouts, vegetation, canopy gaps, long term studies

PURPOSE:

Evaluate alternative silvicultural approaches for converting uniform even-aged stands of Douglas-fir to more complex, uneven-aged stand structure and composition.

METHODS:

Experimental Design - FS123:

Description: Randomized complete block experiment with 4 treatments and 4 blocks. Treatments consist of repeated harvest entries to maintain stand density between 1) RD 30 and 50 (light thin); 2) RD 20 and 40 (moderate thin); 3) RD 20 and 40 with small 1-tree height gaps (thin with gaps); and unthinned (reference).

Field Methods - FS123:

Description:

Experimental treatment units with a minimum of 20 ac (8 ha) were harvested according to treatment assignment using an operational Forest Service harvest contract.

Permanent plot locations with nested circular plots, strip plots and transects for periodic surveys to determine composition (species), abundance (cover or stem density), and size distribution (diameter, height) of vascular plants ranging from forbs to trees. Vegetation data collection occurred pretreatment (1997 or 1998) and post-treatment (2001, 2003 and 2005).

Permanent Plots - FS123:

Description: Initially a random selection of 140 plot centers from a 50-m grid of prospective sample points. Plots established in initial survey and maintained unless inordinately disturbed for all subsequent surveys.

Processing Procedures - FS123:

Description: Minimal processing to calculate sampling unit totals or averages. Processing performed in spreadsheet environment.

Quality Assurance - FS123:

Description: Data field checked for completeness both on site and during post-collection compositing. Data screened for erroneous entries (magnitude) or invalid coding. Repeated observations checked for consistency across years of survey.

Data Entry - FS123:

Description: Manual keyboard entry to spreadsheet (Excel) of data transposed from hand-written field data collection forms.

SUPPLEMENTAL INFORMATION:

As a collaborative effort, implementation and data collection are performed by McKenzie River Ranger District personnel. The Pacific Northwest Research Station provides study oversight, data analysis and reporting.

SITE DESCRIPTION:

Sixteen forest stands within the Lookout Creek and McRae Creek drainages, HJ Andrews Experimental Forest, regenerated after old-growth harvest in the 1950s.

TAXONOMIC SYSTEM:

USDA Plants Database

GEOGRAPHIC EXTENT:

H. J. Andrews Experimental Forest, Western Cascades, Oregon

ELEVATION_MINIMUM (meters):

512

ELEVATION_MAXIMUM (meters):

966

MEASUREMENT FREQUENCY:

Biennial to 5-year intervals

PROGRESS DESCRIPTION:

Complete

UPDATE FREQUENCY DESCRIPTION:

notPlanned

CURRENTNESS REFERENCE:

Ground condition