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TD012
Dimensions, cover, volumes, mass and nutrient stores of Coarse Woody Debris (bark and wood from logs, snags, and stumps) from forests plots in the western United States and Mexico, 1977 to 2005

PRINCIPAL INVESTIGATOR: Mark E. Harmon
ORIGINATOR: Mark E. Harmon
DATA SET CONTACT PERSON: Mark E. Harmon
METADATA CONTACT: Becky Fasth
ABSTRACTOR: Mark E. Harmon
METADATA CREATION DATE:
10 Jan 1999
MOST RECENT METADATA REVIEW DATE:
3 Sep 2013
KEYWORDS:
Inorganic nutrients, Organic matter, biomass, decay rates, decomposition, inorganic nutrients, nutrients, woody debris, coarse woody debris, organic matter, terrestrial ecosystems, logs
PURPOSE:
These data provide an inventory of the volume, mass and nutrients stored within various forest types by coarse woody debris. These data can be used as either part of a mass or nutrient budget, or description of habitat (cover and volume).
METHODS:
Experimental Design - TD012 :
Description: Stands were subjectly choosen to represent a forest type and successional stage. Standard reference stand grid and mapping technique. Usually a 1ha area was divided into 25x25m plots, further divided into 5x5m sections with string for mapping. In some cases, the maps were used to record log and snag dimensions, whereas in other cases log and snag dimensions were measured in the field and recorded on separate forms.
Field Methods - TD012 :
Description: Snag and log diameters measured with Calipers or diameter tape to nearest cm. Snag height was visually estimated in the field in some cases and measured in some cases. Log lengths were taken from maps using a ruler in most cases, but in some cases actual lengths were measured using a tape in the field. The upper end diameter of the snags was estimated assuming a taper of 2cm/m (taper factor). Density and nutrient values were taken from published and unpublished studies. The source of the values is noted in TD1202 file.
SUPPLEMENTAL INFORMATION:

This is a reference data set, created as a library of information.

Sources used for compiling data in database TD012, table 2 (Density and Nutrient Concentration Data):

Reference 1: Harman and Whigman, upublished data in FSDB databases TD022

Reference 2:Harmon, Mark E.; Cromack, Kermit Jr.; Smith, Bradley G. 1987. Coarse woody debris in mixed-conifer forests, Sequoia National Park, California. Canadian Journal of Forest Research. 17: 1265-1272.

Reference 3: Harman, upublished data in FSDB databases TD022

Reference 4: Wilson, Funck, and Avery, 1987. Fuelwood characteristics of northwestern conifers and hardwoods. FRL RES. BULL 60.

Reference 5: Sollins, Phillip; Cline, Steven P.; Verhoeven, Thomas; Sachs, Donald; Spycher, Gody. 1987. Patterns of log decay in old-growth Douglas-fir forests. Canadian Journal of Forest Research. 17(12): 1585-1595.

Reference 6: Graham, Robin Lambert; Cromack, Kermit Jr. 1982. Mass, nutrient content, and decay rate of dead boles in rain forests of Olympic National Park. Canadian Journal of Forest Research. 12: 511-521.

Reference 7: See FSDB database TV009, table 8 containing a mean for a species based on literature values.Data sources were compiled in source reference 4 .

Reference 8: Harmon, Mark E. 1989. Effects of bark fragmentation on plant succession on conifer logs in the Picea - Tsuga forests of Olympic National Park, Washington. American Midland Naturalist. 121: 112-124.

Reference 9: Graham, Robin Lee Lambert. 1981. Biomass dynamics of dead Douglas-fir and western hemlock boles in mid-elevation forests of the Cascade Range. Corvallis, OR: Oregon State University. 152 p. Ph.D. dissertation.
SITE DESCRIPTION:
The charcateristics of the stands sampled varies. Exact descriptions for some of the stands are contained in the TV010 database. see http://andlter.forestry.oregonstate.edu/data/abstract.aspx?dbcode=TV010 for plot descriptions.
TAXONOMIC SYSTEM:
Garrison et al., 1976
GEOGRAPHIC EXTENT:
Primarily Pacific Northwest (OR, WA), but includes data from Yucatan, Mexico and the Rocky Mountains (CO).
ELEVATION_MINIMUM (meters):
ELEVATION_MAXIMUM (meters):
MEASUREMENT FREQUENCY:
Irregular
PROGRESS DESCRIPTION:
Complete
UPDATE FREQUENCY DESCRIPTION:
irregular
CURRENTNESS REFERENCE:
Ground condition