A tablet displays the study plot with the stem map of all the tagged trees in Reference Stand 38, a site within a regional long-term study on vegetation
Pacific Northwest Permanent Sample Plot Program, Field work 2021
The Pacific Northwest Permanent Sample Plot Program is a long-term study of forest vegetation across the Pacific Northwest. The program samples 135 plots across a diversity of forest types in Oregon and Washington. Many of the plots are within the HJ Andrews Experimental Forest. Long-term observational data such as these are essential to understanding the fundamental processes of tree growth, mortality, regeneration and plant succession. This photo gallery highlights field work in summer 2021 within Reference Stand 38 in the HJ Andrews Experimental Forest.
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_001
Field crew leader Andy Bluhm reviews the study plot map
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_002
Lookout Creek
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_003
Lookout Creek
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_004
Field technician Sean Marcum records data on tree size and tree health
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_005
Andy Bluhm locates a tagged tree, part of a long-term study on vegetation
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_006
Andy Bluhm measures the diameter of a pacific yew tree that has a trunk growing parallel to the ground
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_007
Field technician Sean Marcum records data on tree size and tree health as crew members measure and call out their data for recording
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_008
Moving through the research plots can be a challenge due to large logs and steep slopes
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_009
A tagged tree in the long-term vegetation permanent study plot study
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_010
Field technician Sean Marcum records data on tree size and tree health
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_011
Taking the diameter of a tagged tree, just above the nail. This tree is about 17cm diameter.
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_012
Recording the tag number and diameter of a tree in the long-term vegetation study
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_013
Researchers find and measure every tree in the study plot and mark each one off as they go. All tagged trees are tracked from year to year, over decades.
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_014
Sometimes a tag comes off a tree and needs to be replaced
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_015
Recording the tag number and diameter of a tree in the long-term vegetation study
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_016
Comparing leaves of western hemlock (left) and Pacific yew (right)
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_017
Comparing leaves of western hemlock (left) and Pacific yew (right)
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_018
Andy Bluhm measures the diameter of a large Douglas fir tree in the HJ Andrews Experimental Forest
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_019
Andy Bluhm measures the diameter of a large Douglas fir tree in the HJ Andrews Experimental Forest
Photographed by: Lina DiGregorio
Date: 8/12/2021
Photo number: afe_020