Gregory, S.; Sobota, D. 2011. Fall directions and breakage of trees along streams in the Pacific Northwest, 2000-2002 Long-Term Ecological Research Andrews Forest LTER Site. [Database]. Available: https://andrewsforest-stage.forestry.oregonstate.edu/data/fsdb-data-catalog/TD042 Accessed 2026-05-10.

This database contains data on patterns of fall and breakage by riparian trees along streams in the Pacific Northwest. Data in these tables were collected from 2000-2002. Two tables are included. (1) site descriptions and (2) tree fall. The site descriptions table contains information on the geographic location (general physiographic location, political state, and river drainage basin), physical aspects of the channel (active channel width, valley floor width, and channel gradient), and structure of the riparian forest (general age, tree density and basal area, and average tree height/diameter breast height ratio of down trees at the site). Physical aspects of the channel are average values taken at 20-m intervals within the site except for channel gradient, which are average values for 100-m intervals. Stand density (trees per ha) and basal area (m per ha) were measured with the point- center quarter method, please see Dan Sobota's Master's thesis (Pub 4337) for more details. The tree fall table contains information on individual trees measured at each site in the study. Species, geomorphic landform of rooting position, streamside location, and type of tree fall (stem break or root throw event) are descriptive variables for each tree. Tree height, diameter at breast height and diameter at the top of the tree describe tree size. Side slope at tree base and distance from the active channel describe the physical location of the tree along the stream. Number of pieces only includes those produced when the tree first fell. Fall direction is normalized to 0 degrees upstream and 90 degrees directly towards the stream for trees located on both stream banks.

Temporal coverage: 2000-01-09 to 2002-06-21

Geographic coverage: N/A

Bounds: W N/A, E N/A, N N/A, S N/A

• 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.

Title: Long-Term Ecological Research

• Stanley V. Gregory
  Role: Principal Investigator
  Oregon State University;Dept. of Fisheries and Wildlife;Nash Hall 104, Corvallis, OR, 97331, USA
  Phone: (541) 737-1951
  Email: stanley.gregory@oregonstate.edu
  URL: http://oregonstate.edu/dept/pnw-erc/personnel/gregory.htm
• Stanley V. Gregory
  Role: Creator
  Oregon State University;Dept. of Fisheries and Wildlife;Nash Hall 104, Corvallis, OR, 97331, USA
  Phone: (541) 737-1951
  Email: stanley.gregory@oregonstate.edu
  URL: http://oregonstate.edu/dept/pnw-erc/personnel/gregory.htm
• Daniel J. Sobota
  Role: Creator
  OR, USA
  Email: sobota.daniel@deq.state.or.us

• Information Manager
  Andrews Forest LTER Program, US Forest Service Pacific Northwest Research Station, 3200 SW Jefferson Way, Corvallis, OR, 97331
  Email: hjaweb@fsl.orst.edu
  URL: http://andrewsforest.oregonstate.edu/
• Stanley V. Gregory
  Oregon State University;Dept. of Fisheries and Wildlife;Nash Hall 104, Corvallis, OR, 97331, USA
  Phone: (541) 737-1951
  Email: stanley.gregory@oregonstate.edu
  URL: http://oregonstate.edu/dept/pnw-erc/personnel/gregory.htm

• Andrews Forest LTER Site
  Role: Publisher
  Forest Ecosystems and Society Department in Forestry, Oregon State University, 201K Richardson Hall, Corvallis, OR, 97331-5752
  Phone: (541) 737-8480
  Email: lterweb@fsl.orst.edu
  URL: http://andrewsforest.oregonstate.edu/

This database contains data on patterns of fall and breakage by riparian trees along streams in the Pacific Northwest. Data in these tables were collected from 2000-2002. Two tables are included. (1) site descriptions and (2) tree fall. The site descriptions table contains information on the geographic location (general physiographic location, political state, and river drainage basin), physical aspects of the channel (active channel width, valley floor width, and channel gradient), and structure of the riparian forest (general age, tree density and basal area, and average tree height/diameter breast height ratio of down trees at the site). Physical aspects of the channel are average values taken at 20-m intervals within the site except for channel gradient, which are average values for 100-m intervals. Stand density (trees per ha) and basal area (m per ha) were measured with the point- center quarter method, please see Dan Sobota's Master's thesis (Pub 4337) for more details. The tree fall table contains information on individual trees measured at each site in the study. Species, geomorphic landform of rooting position, streamside location, and type of tree fall (stem break or root throw event) are descriptive variables for each tree. Tree height, diameter at breast height and diameter at the top of the tree describe tree size. Side slope at tree base and distance from the active channel describe the physical location of the tree along the stream. Number of pieces only includes those produced when the tree first fell. Fall direction is normalized to 0 degrees upstream and 90 degrees directly towards the stream for trees located on both stream banks. 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. Field Methods - TD042

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.

Method Steps

Sampling

No software entries listed in this EML file.

• LTER controlled vocabulary: disturbance (theme), wood (theme), woody debris (theme), organic matter (theme), trees (theme)
• Andrews Experimental Forest site thesaurus: riparian ecosystems (theme)
• LTER core research areas: disturbance (theme), organic matter (theme)

• All Organisms: All Organisms
• Highest common category (ca. kingdom): Plantae
• Division or Phylum: Coniferophyta
• Class: Pinopsida
• Order: Pinales
• Family: Pinaceae
• Genus: Tsuga
• Species: Tsuga heterophylla
• Genus: Pseudotsuga
• Species: Pseudotsuga menziesii
• Genus: Pinus
• Species: Pinus contorta
• Species: Pinus ponderosa
• Genus: Picea
• Species: Picea engelmannii
• Species: Picea sitchensis
• Genus: Abies
• Species: Abies grandis
• Genus: Larix
• Species: Larix occidentalis
• Family: Cupressaceae
• Genus: Thuja
• Species: Thuja plicata
• Division or Phylum: Magnoliophyta
• Class: Magnoliopsida
• Subclass: Hamamelididae
• Order: Fagales
• Family: Betulaceae
• Genus: Alnus
• Species: Alnus rubra
• Species: Alnus rhombifolia
• Subclass: Rosidae
• Order: Sapindales
• Family: Aceraceae
• Genus: Acer
• Species: Acer glabrum
• Species: Acer circinatum
• Species: Acer macrophyllum

No related dataset codes found in the EML text fields.

• Sobota, Daniel J. 2003. Fall directions and breakage of riparian trees along streams in the Pacific Northwest. Corvallis, OR: Oregon State University. 126 p. M.S. thesis.

No related files listed in this EML file.

Data Use Agreement:

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. This Data Set is released under the Creative Commons license CC BY "Attribution" (see: https://creativecommons.org/licenses/by/4.0/). Creative Commons license CC BY - Attribution is a license that allows others to distribute, remix, tweak, and build upon your work (even commercially), as long as you are credited for the original creation. This license accommodates maximum dissemination and use of licensed materials.

It is considered professional conduct and an ethical obligation to acknowledge the work of other scientists. The Data User is asked to provide attribution of the original work if this data package is shared in whole or by individual parts or used in the derivation of other products. A recommended citation is provided for each Data Set in the Andrews LTER data catalog (see: http://andlter.forestry.oregonstate.edu/data/catalog/datacatalog.aspx). A generic citation is also provided for this Data Set on the website https://portal.edirepository.org in the summary metadata page. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed and all data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data.

General acknowledgement: Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University.

License: N/A

Maintenance update frequency: notPlanned

Description

• An update history is logged and maintained with each new version of every dataset.

Change History

• Version2 (2004-05-17)
  Metadata restructured and moved into SQLServer metadata database LTERMETA. Data moved into SQLServer database FSDBDATA.
• Version1 (2004-05-17)
  Original metadata creation