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Are standing dead trees (snags) suitable as climate proxies? A case study from the central Scandinavian Mountains
Stockholm University, Faculty of Science, Department of Physical Geography.
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2017 (English)In: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891Article in journal (Refereed) Epub ahead of print
Abstract [en]

Standing dead trees (snags) play important roles in forest ecology by storing carbon as well as providing habitats for many species. Moreover, snags preserved for hundreds of years can provide useful data to extend tree-ring chronologies used for climatological and ecological studies beyond the lifespans of living trees. Here we examined the growth patterns of Scots pine snags from the central Scandinavian Mountains, in relation to still living trees. Using changes point analyses, we showed that a majority (74%) of the snags displayed significant negative growth changes prior (on average 17 years) to death. Change points around the same years were also seen in living trees, but they recovered their growth. The average growth reduction of snags showing negative growth changes before death was 46%. In most cases the final growth change points coincided with very cold summers, or to a lesser degree to period of cool summers. It was suggested that pines ending up as snags were less resilient than the trees which continued living, and thus not able to recover after cold summer events. Since the snag growth reductions prior to death were partly unrelated to climate, care should be taken when using such data in dendroclimatological studies.

Place, publisher, year, edition, pages
2017.
Keyword [en]
Scots pine, snags, mortality, climate extremes, dendroclimatology
National Category
Climate Research
Identifiers
URN: urn:nbn:se:su:diva-148846DOI: 10.1080/02827581.2017.1341547OAI: oai:DiVA.org:su-148846DiVA: diva2:1156508
Available from: 2017-11-13 Created: 2017-11-13 Last updated: 2017-11-22

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Gunnarson, Björn E.
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