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The Resource Canopy structure on forest lands in western Oregon : differences among forest types and stand ages, Anne C.S. McIntosh, Andrew N. Gray, and Steven L. Garman, (electronic resource)

Canopy structure on forest lands in western Oregon : differences among forest types and stand ages, Anne C.S. McIntosh, Andrew N. Gray, and Steven L. Garman, (electronic resource)

Creator
Contributor
Summary
Canopy structure is an important attribute affecting economic and ecological values of forests in the Pacific Northwest. However, canopy cover and vertical layering are rarely measured directly; they are usually inferred from other forest measurements. In this study, we quantified and compared vertical and horizontal patterns of tree canopy structure and understory cover along a successional gradient of forests and among stands with different thinning histories on nonfederal lands in western Oregon. Analyses focused on three dominant forest type groups: wet conifer, wet hardwood, and dry hardwood. We used data from 917 systematically located, forested Forest Inventory and Analysis plots measured between 1995 and 1997. On each plot, canopy cover by layer and species was measured on line-intercept transects, and cover of understory species was measured on five subplots. Trends in canopy structure with stand age did not always follow the patterns predicted by common successional models. Most of the cover in moist stands was in the upper tree layer, but cover in dry hardwood stands was more evenly distributed among layers. Contrary to expectations of canopy closure, mean canopy cover by age class rarely exceeded 85 percent, even in unthinned productive young conifer forests. Possibly as a result, effects of stand age on understory vegetation were minimal, except for low levels of forbs found in 20- to 40-year-old wet conifer stands. Shade-tolerant tree species rarely made up more than 20 percent of canopy cover, even in the lower canopy layers and in stands >100 years old. Although heavily thinned stands had lower total cover, canopy structure did not differ dramatically between thinned and unthinned stands. Our findings suggest potential limitations of simple stand succession models that may not account for the range of forest types, site conditions, and developmental mechanisms found across western Oregon
Language
eng
Work
Publication
Extent
1 online resource (35 pages)
Note
  • Title from title screen (viewed on Sept. 8, 2011)
  • "August 2009."
Instance
Label
Canopy structure on forest lands in western Oregon : differences among forest types and stand ages
Title
Canopy structure on forest lands in western Oregon
Title remainder
differences among forest types and stand ages
Statement of responsibility
Anne C.S. McIntosh, Andrew N. Gray, and Steven L. Garman
Creator
Contributor
Subject
Genre
Language
eng
Summary
Canopy structure is an important attribute affecting economic and ecological values of forests in the Pacific Northwest. However, canopy cover and vertical layering are rarely measured directly; they are usually inferred from other forest measurements. In this study, we quantified and compared vertical and horizontal patterns of tree canopy structure and understory cover along a successional gradient of forests and among stands with different thinning histories on nonfederal lands in western Oregon. Analyses focused on three dominant forest type groups: wet conifer, wet hardwood, and dry hardwood. We used data from 917 systematically located, forested Forest Inventory and Analysis plots measured between 1995 and 1997. On each plot, canopy cover by layer and species was measured on line-intercept transects, and cover of understory species was measured on five subplots. Trends in canopy structure with stand age did not always follow the patterns predicted by common successional models. Most of the cover in moist stands was in the upper tree layer, but cover in dry hardwood stands was more evenly distributed among layers. Contrary to expectations of canopy closure, mean canopy cover by age class rarely exceeded 85 percent, even in unthinned productive young conifer forests. Possibly as a result, effects of stand age on understory vegetation were minimal, except for low levels of forbs found in 20- to 40-year-old wet conifer stands. Shade-tolerant tree species rarely made up more than 20 percent of canopy cover, even in the lower canopy layers and in stands >100 years old. Although heavily thinned stands had lower total cover, canopy structure did not differ dramatically between thinned and unthinned stands. Our findings suggest potential limitations of simple stand succession models that may not account for the range of forest types, site conditions, and developmental mechanisms found across western Oregon
Member of
Cataloging source
NRC
http://library.link/vocab/creatorName
McIntosh, Anne C. S
Government publication
federal national government publication
Illustrations
  • illustrations
  • maps
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
http://library.link/vocab/relatedWorkOrContributorDate
1955-
http://library.link/vocab/relatedWorkOrContributorName
  • Gray, Andrew N
  • Garman, Steven L.
  • Pacific Northwest Research Station (Portland, Or.)
Series statement
General technical report PNW
Series volume
GTR-794
http://library.link/vocab/subjectName
  • Forest canopies
  • Understory plants
  • Plant succession
  • Forest thinning
Label
Canopy structure on forest lands in western Oregon : differences among forest types and stand ages, Anne C.S. McIntosh, Andrew N. Gray, and Steven L. Garman, (electronic resource)
Instantiates
Publication
Note
  • Title from title screen (viewed on Sept. 8, 2011)
  • "August 2009."
Bibliography note
Includes bibliographical references (pages 28-33)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Color
black and white
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
719436391
Dimensions
unknown
Extent
1 online resource (35 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations, map
Specific material designation
remote
Label
Canopy structure on forest lands in western Oregon : differences among forest types and stand ages, Anne C.S. McIntosh, Andrew N. Gray, and Steven L. Garman, (electronic resource)
Publication
Note
  • Title from title screen (viewed on Sept. 8, 2011)
  • "August 2009."
Bibliography note
Includes bibliographical references (pages 28-33)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Color
black and white
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
719436391
Dimensions
unknown
Extent
1 online resource (35 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations, map
Specific material designation
remote

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