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Taking the diameter of a tagged tree, just above the nail. This tree is about 17cm diameter.
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Recording the tag number and diameter of a tree in the long-term vegetation study
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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.
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Sometimes a tag comes off a tree and needs to be replaced
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Recording the tag number and diameter of a tree in the long-term vegetation study
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Comparing leaves of western hemlock (left) and Pacific yew (right)
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Comparing leaves of western hemlock (left) and Pacific yew (right)
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Andy Bluhm measures the diameter of a large Douglas fir tree in the HJ Andrews Experimental Forest
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Andy Bluhm measures the diameter of a large Douglas fir tree in the HJ Andrews Experimental Forest
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Climbing rope, harnesses, lanyard, ascenders and carabiners are tools of the trade for a canopy ecologist whose field work is up in the trees
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Instruments measure air temperature, air humidity, and air movement. The measurements on the ground are compared to measurements taken in the tree canopy.
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A dendrometer band around a large Douglas-fir tree measures the daily and annual swell and contraction of the tree trunk.
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A dendrometer band around a large Douglas-fir tree measures the daily and annual swell and contraction of the tree trunk.
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Tree climbers use carabiners to climb and to attach their gear to their harnesses
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Adam Sibley 56 meters above ground in the Discovery Tree. The white enclosure above his head contains the data logger that records and transmits data from sensors in the upper canopy.
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Mark Schulze, Andrews Forest Director, begins his ascent into the canopy to take measurements
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Mark Schulze, Andrews Forest Director, takes a few minutes in the mid canopy as he makes his way high into the tree tops to make measurements
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The blue and white discs in this image contain spore collectors for measuring the diversity of fungal spores which make it to this height in the canopy. This setup is replicated at six canopy heights.
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The orange needles on this western hemlock branch are scorched, caused by a heat dome in summer 2021 that brought maximum air temperatures above 110 o F for three consecutive days.
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The orange needles on this western hemlock branch are scorched, caused by a heat dome in summer 2021 that brought maximum air temperatures above 110 o F for three consecutive days.
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Mark Schulze clips samples of branches high in the canopy as part of a study on needle scorch caused by the heat dome of summer 2021
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Adam Sibley, graduate student, at ease high in the canopy. Adam spend many days and hours in the canopy for his research on assessing tree canopy microclimate and the response of trees to...
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Looking down from high in the canopy into the crowns of neighboring trees