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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
Dendrochronologia, Volume: 55, Pages: 50 - 59
Swansea University Author:
Mary Gagen
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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...
Published in: | Dendrochronologia |
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ISSN: | 11257865 |
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2019
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URI: | https://cronfa.swan.ac.uk/Record/cronfa49146 |
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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 |
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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 |
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Journal article |
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Dendrochronologia |
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55 |
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Swansea University |
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11257865 |
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10.1016/j.dendro.2019.03.001 |
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Faculty of Science and Engineering |
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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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1763753062723223552 |
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11.021648 |