TD042
Fall directions and breakage of trees along streams in the Pacific Northwest, 2000-2002

CREATOR(S): Stanley V. Gregory, Daniel J. Sobota

PRINCIPAL INVESTIGATOR(S): Stanley V. Gregory

ORIGINATOR(S): Daniel J. Sobota

DATA SET CONTACT PERSON: Stanley V. Gregory

METADATA CONTACT: Daniel J. Sobota

DATA SET CREDIT:

National Council for Air and Stream Improvement, Inc. (NCASI); H.J. Andrews LTER program

METADATA CREATION DATE:

13 Jul 2004

MOST RECENT METADATA REVIEW DATE:

18 Dec 2012

KEYWORDS:

Disturbance, Organic matter, disturbance, wood, woody debris, organic matter, riparian ecosystems, trees

PURPOSE:

This database was created to provide information for individuals or groups interested in modeling recruitment of wood from riparian forests to streams. Specific information can be queried for specific situations. Fall directions and piece numbers can be converted to probability values according to methods in Dan Sobota's Master's thesis.

METHODS:

Experimental Design - TD042 :

Description: Sites in this study selected according to region (west or east of Cascades crest) and forest age (40-70 years old; 80-150 years old; >150 years old). Intensive surveys performed on a randomly-selected 200-300-m reach of stream, extending to 50 m upslope (ground distance) on each streamside. Up to 100 fallen trees (approximately half per streamside) were surveyed at each site. Empirical measurements of diameter at breast height, tree height, fall direction (standardized to streamside and valley orientation) were conducted for trees greater than 10 cm diameter at breast height in the study site.

Field Methods - TD042 :

Description: The point-center quarter method (Cottam and Curtis 1956) was used for quantification of riparian forest characteristics.

Statistical Methods - TD042 :

Description: Statistics/algorithms (include name, description, and citation):

SITE DESCRIPTION:

Provide a general description of the site. Coast Range: Douglas-fir/western hemlock forest zone; basalts, oceanic floor crusts and marine and estuarine sedimentary rocks Western Cascades: Douglas-fir/western hemlock forest zone; andesites, basalts, rhyolites and minor sedimentary rock types Eastern Cascades: Douglas-fir/western hemlock/Ponderosa Pine forests; andesites, basalts, rhyolites and minor sedimentary rock types Intermountain West: Douglas-fir/ponderosa pine/lodgepole pine/western larch forests; Columbia Basalts and glacial deposits

TAXONOMIC SYSTEM:

None

GEOGRAPHIC EXTENT:

Western Oregon and Washington, East Cascades of Washington, Wallowa Mountains of Oregon, Northern Rocky Mountains of Idaho and Montana

ELEVATION_MINIMUM (meters):

100

ELEVATION_MAXIMUM (meters):

1500

MEASUREMENT FREQUENCY:

Data were collected at a single visit to each site

PROGRESS DESCRIPTION:

Complete

UPDATE FREQUENCY DESCRIPTION:

notPlanned

CURRENTNESS REFERENCE:

Ground condition