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Monitoring and Modeling Legacy Tree ...

Ball, Isaac Joseph,

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Monitoring and Modeling Legacy Tree Response to Restoration Treatments in the Klamath Mountains, Oregon, USA /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Monitoring and Modeling Legacy Tree Response to Restoration Treatments in the Klamath Mountains, Oregon, USA // Isaac Joseph Ball.
Author:	Ball, Isaac Joseph,
Description:	1 electronic resource (100 pages)
Notes:	Source: Masters Abstracts International, Volume: 86-10.
Contained By:	Masters Abstracts International86-10.
Subject:	Forestry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31841936
ISBN:	9798310349643

Monitoring and Modeling Legacy Tree Response to Restoration Treatments in the Klamath Mountains, Oregon, USA /
Ball, Isaac Joseph,

Monitoring and Modeling Legacy Tree Response to Restoration Treatments in the Klamath Mountains, Oregon, USA /Isaac Joseph Ball. - 1 electronic resource (100 pages)

Source: Masters Abstracts International, Volume: 86-10.

Climate change and its disruption of historical drought and wildfire patterns pose a substantial threat to forest health in the western United States. This threat is compounded by past management practices like fire suppression. The largest, oldest, and most ecologically valuable trees are particularly vulnerable, making their conservation a key objective of climate-adaptive forest management. Restoration treatments such as mechanical thinning have been shown to enhance tree growth and drought resilience in dry conifer forests, but long-term monitoring is necessary to understand their sustained effects. This study used dendroecological tree-ring analysis to investigate the effects of thinning on the growth, vigor, and resilience of large old trees. Four species were sampled in 2022 from the Ashland watershed in Southwestern Oregon, which underwent variable-intensity thinning from 2011-2013 as part of the Ashland Forest Resiliency Stewardship project. Results revealed that legacy tree growth generally declined over the past decade due to extreme drought, but thinning mitigated drought impacts for some species by improving resistance to growth decline or slowing reductions. Treatment responses were species-specific, with Pinus ponderosa showing improved drought resistance, Pinus lambertiana exhibiting temporary growth release followed by decline, and Pseudotsuga menziesii var. menziesii and Arbutus menziesii displaying inconclusive or masked responses. Thinning effects also varied by topoclimatic conditions, with moderately dry sites showing the most significant improvements for P. menziesii and P. ponderosa, while P. lambertiana benefited most at wet sites. Overall, findings suggest that thinning can enhance vigor and drought resilience in some legacy tree species, but its efficacy depends on species traits, site conditions, and treatment intensity.

English

ISBN: 9798310349643Subjects--Topical Terms:

895157
Forestry.
Subjects--Index Terms:

Forest management

Monitoring and Modeling Legacy Tree Response to Restoration Treatments in the Klamath Mountains, Oregon, USA /
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245 1 0 $a Monitoring and Modeling Legacy Tree Response to Restoration Treatments in the Klamath Mountains, Oregon, USA / $c Isaac Joseph Ball.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2025
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500 $a Advisors: Holz, Andres Committee members: Loikith, Paul; Ramirez, Aaron.
502 $b M.S. $c Portland State University $d 2025.
520 $a Climate change and its disruption of historical drought and wildfire patterns pose a substantial threat to forest health in the western United States. This threat is compounded by past management practices like fire suppression. The largest, oldest, and most ecologically valuable trees are particularly vulnerable, making their conservation a key objective of climate-adaptive forest management. Restoration treatments such as mechanical thinning have been shown to enhance tree growth and drought resilience in dry conifer forests, but long-term monitoring is necessary to understand their sustained effects. This study used dendroecological tree-ring analysis to investigate the effects of thinning on the growth, vigor, and resilience of large old trees. Four species were sampled in 2022 from the Ashland watershed in Southwestern Oregon, which underwent variable-intensity thinning from 2011-2013 as part of the Ashland Forest Resiliency Stewardship project. Results revealed that legacy tree growth generally declined over the past decade due to extreme drought, but thinning mitigated drought impacts for some species by improving resistance to growth decline or slowing reductions. Treatment responses were species-specific, with Pinus ponderosa showing improved drought resistance, Pinus lambertiana exhibiting temporary growth release followed by decline, and Pseudotsuga menziesii var. menziesii and Arbutus menziesii displaying inconclusive or masked responses. Thinning effects also varied by topoclimatic conditions, with moderately dry sites showing the most significant improvements for P. menziesii and P. ponderosa, while P. lambertiana benefited most at wet sites. Overall, findings suggest that thinning can enhance vigor and drought resilience in some legacy tree species, but its efficacy depends on species traits, site conditions, and treatment intensity.
546 $a English
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650 4 $a Ecology. $3 516476
650 4 $a Climate change. $2 bicssc $3 2079509
653 $a Forest management
653 $a Wildfire
653 $a Southwestern Oregon
653 $a Forest health
653 $a Drought resilience
690 $a 0478
690 $a 0329
690 $a 0404
690 $a 0474
710 2 $a Portland State University. $b Geography. $e degree granting institution. $3 3828620
720 1 $a Holz, Andres $e degree supervisor.
773 0 $t Masters Abstracts International $g 86-10.
790 $a 0180
791 $a M.S.
792 $a 2025
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31841936