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The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean

Mary Gagen Orcid Logo, Neil Matthews, Sandra Denman, Martin Bridge, Andrew Peace, Rebecca Pike, Giles Young

Dendrochronologia, Volume: 55, Pages: 50 - 59

Swansea University Author: Mary Gagen Orcid Logo

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DOI (Published version): 10.1016/j.dendro.2019.03.001

Abstract

Declines are a distinctive category of tree disease, complex to define and quantify and challenging to mitigate due to their multiple causes and heterogeneous tree response patterns. In many parts of Europe, oak decline syndromes are impacting tree health and having a measurable economic impact on f...

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Published in: Dendrochronologia
ISSN: 11257865
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa49146
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spelling 2019-04-23T16:08:53.1353378 v2 49146 2019-03-07 The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean e677a6d0777aed90ac1eca8937e43d2b 0000-0002-6820-6457 Mary Gagen Mary Gagen true false 2019-03-07 SGE Declines are a distinctive category of tree disease, complex to define and quantify and challenging to mitigate due to their multiple causes and heterogeneous tree response patterns. In many parts of Europe, oak decline syndromes are impacting tree health and having a measurable economic impact on forestry. In the UK the impact of periodic oak declines is expanding against a backdrop of multiple environmental pressures, to become capable of threatening the UK’s native oak woodland. Here we explore the growth histories of oak trees at a site symptomatic of Chronic Oak Decline (COD), in the South of England; Speculation Cannop in the Forest of Dean. The dendrochronological picture at the site reveals that trees with current external COD symptoms have shown suppressed growth, in relation to the regional average, from early in their lives. Moreover, there is an amplified reduction in minimum ring width in Symptomatic trees as compared to a healthy subsample of Control trees, likely to be dominated by reduced latewood width in affected trees. Broadly, the site reveals the appearance of decline, roughly 40 years after tree planting, around 1860. There is considerable variability in the later decline history pattern in Symptomatic trees but there are clusters of decline episodes in the 1920s, 1960s, 1980s and 1990s at this site. The Control trees are not always unaffected but rather show growth releases after each historical decline phase. The trees that currently show external decline symptoms do not have a history of these growth releases. We conclude that investigating the tree ring growth histories at sites impacted by COD could provide an important management tool, and ring width histories of trees at affected sites should be used in the identification of the decline predisposing factors, that a management strategy requires. Journal Article Dendrochronologia 55 50 59 11257865 Oak Decline, Dendrochronology, Tree Rings, Climate Change 30 6 2019 2019-06-30 10.1016/j.dendro.2019.03.001 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University 2019-04-23T16:08:53.1353378 2019-03-07T11:12:43.0596587 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Mary Gagen 0000-0002-6820-6457 1 Neil Matthews 2 Sandra Denman 3 Martin Bridge 4 Andrew Peace 5 Rebecca Pike 6 Giles Young 7 0049146-07032019111352.pdf GagenetalDendroC2019OakDeclineFinalAccepted.pdf 2019-03-07T11:13:52.6230000 Output 424660 application/pdf Accepted Manuscript true 2020-03-30T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng
title The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean
spellingShingle The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean
Mary Gagen
title_short The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean
title_full The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean
title_fullStr The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean
title_full_unstemmed The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean
title_sort The tree ring growth histories of UK native oaks as a tool for investigating Chronic Oak Decline: An example from the Forest of Dean
author_id_str_mv e677a6d0777aed90ac1eca8937e43d2b
author_id_fullname_str_mv e677a6d0777aed90ac1eca8937e43d2b_***_Mary Gagen
author Mary Gagen
author2 Mary Gagen
Neil Matthews
Sandra Denman
Martin Bridge
Andrew Peace
Rebecca Pike
Giles Young
format Journal article
container_title Dendrochronologia
container_volume 55
container_start_page 50
publishDate 2019
institution Swansea University
issn 11257865
doi_str_mv 10.1016/j.dendro.2019.03.001
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Geography{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Geography
document_store_str 1
active_str 0
description Declines are a distinctive category of tree disease, complex to define and quantify and challenging to mitigate due to their multiple causes and heterogeneous tree response patterns. In many parts of Europe, oak decline syndromes are impacting tree health and having a measurable economic impact on forestry. In the UK the impact of periodic oak declines is expanding against a backdrop of multiple environmental pressures, to become capable of threatening the UK’s native oak woodland. Here we explore the growth histories of oak trees at a site symptomatic of Chronic Oak Decline (COD), in the South of England; Speculation Cannop in the Forest of Dean. The dendrochronological picture at the site reveals that trees with current external COD symptoms have shown suppressed growth, in relation to the regional average, from early in their lives. Moreover, there is an amplified reduction in minimum ring width in Symptomatic trees as compared to a healthy subsample of Control trees, likely to be dominated by reduced latewood width in affected trees. Broadly, the site reveals the appearance of decline, roughly 40 years after tree planting, around 1860. There is considerable variability in the later decline history pattern in Symptomatic trees but there are clusters of decline episodes in the 1920s, 1960s, 1980s and 1990s at this site. The Control trees are not always unaffected but rather show growth releases after each historical decline phase. The trees that currently show external decline symptoms do not have a history of these growth releases. We conclude that investigating the tree ring growth histories at sites impacted by COD could provide an important management tool, and ring width histories of trees at affected sites should be used in the identification of the decline predisposing factors, that a management strategy requires.
published_date 2019-06-30T03:59:56Z
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