Mortality of urban pines in Helsinki explored using tree rings and climate records View Full Text


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Article Info

DATE

2012-04

AUTHORS

Samuli Helama, Alar Läänelaid, Juha Raisio, Heikki Tuomenvirta

ABSTRACT

The mortality of Scots pine trees in and around Helsinki has been reported in recent years, but the causalities of these deaths have not so far been rigorously examined. Tree-ring analyses have previously shown to effectively reveal historical growth variability and thus hint at the stress factors behind tree mortality. Here, we analyzed the tree rings of pines in two tree classes (living and dead) from an urban park in Helsinki to reveal their growth variations and to examine the obtained chronologies along with climatic data. Guided by tree-ring information, the pine growth over the past century could be divided into four episodes: average growth conditions during the first half of the twentieth century, a suppressed growth period during the 1950s and 1960s, a growth release since the mid-1970s, and a period of recent mortality. The two tree classes became particularly differentiated during the release period in that the growth of surviving pines underwent a more positive and abrupt growth anomaly in comparison to dead pines. The survival of pines could also be linked to their sensitivity to droughts in a long-term context: The growth of still-living pines showed a statistically significant moisture sensitivity over the second half of the century only. The period 2002–2003 (coinciding with drought) was observed as a dendrochronologically dated episode with a 40% mortality. Overall, the results point to the importance of tree competitive strength and climate as predisposing and inciting/contributing factors behind the tree mortality. More... »

PAGES

353-362

References to SciGraph publications

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  • 2006-09. Plant phenological data and tree-rings as palaeoclimate indicators in south-west Finland since AD 1750 in INTERNATIONAL JOURNAL OF BIOMETEOROLOGY
  • 2009-10. Size mediated climate–growth relationships in Pinus halepensis and Pinus pinea in TREES
  • 2011. A Closer Look at Regional Curve Standardization of Tree-Ring Records: Justification of the Need, a Warning of Some Pitfalls, and Suggested Improvements in Its Application in DENDROCLIMATOLOGY
  • 2010-12. State of Scots pine (Pinus sylvestris L.) under nutrient and water deficit on coastal dunes of the Baltic Sea in TREES
  • 2005-12. Tree growth as indicator of tree vitality and of tree reaction to environmental stress: a review in EUROPEAN JOURNAL OF FOREST RESEARCH
  • 2005-09. Europe-wide reduction in primary productivity caused by the heat and drought in 2003 in NATURE
  • 2000-02. Topographic influences on radial growth of Scots pine (Pinus sylvestris L.) at small spatial scales in PLANT ECOLOGY
  • 2008-05. Dendroclimatological analysis of seeded and thinned Scots pine (Pinus sylvestris L.) stands at the coniferous timberline in NEW FORESTS
  • 2008-01. Thinning intensity and growth response in SW-European Scots pine stands in ANNALS OF FOREST SCIENCE
  • 1999-07. Influence of snowfall and melt timing on tree growth in subarctic Eurasia in NATURE
  • 2008-06. Growth response to climate and drought in Pinus nigra Arn. trees of different crown classes in TREES
  • 2004-03. The hydraulic architecture of Pinaceae – a review in PLANT ECOLOGY
  • 2006-04. Drought as an Inciting Mortality Factor in Scots Pine Stands of the Valais, Switzerland in ECOSYSTEMS
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    URI

    http://scigraph.springernature.com/pub.10.1007/s00468-011-0597-z

    DOI

    http://dx.doi.org/10.1007/s00468-011-0597-z

    DIMENSIONS

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