Dendroclimatic signals of pedunculate oak (Quercus robur L.) in Estonia

Sohar, Kristina; Läänelaid, Alar; Eckstein, Dieter; Helama, Samuli; Jaagus, Jaak

doi:10.1007/s10342-014-0783-9

Cited by 32 publications

(21 citation statements)

References 53 publications

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“…The negative pointer years established by other scientists, e.g. 1963 and 1983 by Koprowski (2006), based on the annual increase in tree ring widths in common beech in Poland, or 1990 by Sohar et al (2014) for the tree ring widths of pedunculate oak in Estonia, were also heavily dependent on thermal and rainfall conditions, similar to our results for the years 1955-2014. Narrower rings of those tree species, formed in the years 1963, 1983 and 1990, were determined by a very dry period of May-July, or June, which is similar to tree rings of black locust, affected by a very dry period of July-August (Fig.…”

Section: Discussionsupporting

confidence: 91%

“…The threshold value depends, among others, on the tree species, location, or the size of the tested sample (Wilczyński, 2004;Wilczyński & Szymański 2014). Although the pointer year 1990 was also negative for oaks throughout Estonia (Sohar et al, 2014), and the years 1963 and 1983 were also negative for common beech in north-eastern Poland (Koprowski, 2006), pointer years rarely occur simultaneously in different species of trees, even under similar conditions. It sometimes happens that pointer years are different in the case of trees of the same species but growing at different sites (Bronisz et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

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Identification of meteorological conditions in the growth of Robinia pseudoacacia on the basis of pointer years in urban conditions

Kalbarczyk¹,

Ziemiańska²

2017

Dendrobiology

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This study assessed changes in air temperature and rainfall during the growth of black locusts (Robinia pseudoacacia L.) in urban conditions in the city of Wroclaw based on pointer years. Materials consisted of 54 wooden discs taken from felled straight-trunked trees at a height of 1.3 m from the ground at four sampling sites in the area of a defunct garden established at the turn of the 20 th century. Meteorological indicators were calculated based on monthly data obtained from the Wroclaw meteorological station, part of the national atmospheric monitoring network. Tree ring widths were determined using LINTAB TM 6 and TSAP-Win software. A set of meteorological elements describing temperature and rainfall conditions during the growth of the black locusts significantly affecting the tree ring widths, were selected using cluster analysis. Pointer years were defined as the years when a unidirectional change (e.g. an increase) in tree ring width compared to a previous year was observed in at least 75% of the trees. In the multiannual period 1955-2014 we found seven pointer years, comprising three positive years (tree ring wider than in the year before) : 1986, 1989, 1996, and four negative years (tree ring narrower than in the year before) : 1963, 1983, 1990, 1991. The width of the tree rings were formed under the influence of different unique thermal and rainfall systems each year. Within the groups of positive and negative pointer years, individual months differed in the impact of air temperature and rainfall conditions on tree ring widths.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Identification of meteorological conditions in the growth of Robinia pseudoacacia on the basis of pointer years in urban conditions

Kalbarczyk¹,

Ziemiańska²

2017

Dendrobiology

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“…However, anisohydric traits may lead to a longer drought memory due to high investments to sustain photosynthetic activity, thus leading to a hangover of drought effects. We already know from several studies from Middle Europe [22,25,26,77,78] that oaks react with a delay on drought events. The relative high tolerance of oaks [79] towards water deficits is confirmed by the fact that trees investigated in our study showed no significant growth decline during drought years against average growth.…”

Section: Reactions Of Oak Growth On Drought Events/periodsmentioning

confidence: 99%

Impact of Climate Trends and Drought Events on the Growth of Oaks (Quercus robur L. and Quercus petraea (Matt.) Liebl.) within and beyond Their Natural Range

Perkins

Uhl

Biber

et al. 2018

Forests

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Due to predicted climate change, it is important to know to what extent trees and forests will be impacted by chronic and episodic drought stress. As oaks play an important role in European forestry, this study focuses on the growth response of sessile oak (Quercus petraea (Matt.) Liebl.) and pedunculate oak (Quercus robur (L.)) under contrasting climatic conditions. Analyses cover both site conditions of their natural occurrence (Southern Germany and Northeast Italy) and site conditions beyond their natural range (South Africa). The sites beyond their natural range represent possible future climate conditions. Tree-ring series from three different sites were compared and analysed using dendrochronological methods. The long-term growth development of oak trees appears to be similar across the sites, yet the growth level over time is higher in the drier and warmer climate than in the temperate zone. When compared with previous growth periods, growth models reveal that oak trees grew more than expected during the last decades. A recent setback in growth can be observed, although growth is still higher than the model predicts. By focusing on the short-term reactions of the trees, distinct drought events and periods were discovered. In each climatic region, similar growth reactions developed after drought periods. A decline in growth rate occurred in the second or third year after the drought event. Oaks in South Africa are currently exposed to a warmer climate with more frequent drought events. This climatic condition is a future prediction also for Europe. In view of this climate change, we discuss the consequences of the long-and short-term growth behaviour of oaks grown in the climate of South Africa for a tree species selection that naturally occurs in Europe.

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“…The North-Central European (NCE) oak tree-ring network has been built as the result of intensive work performed in a vast area from Ireland in the west through the Alps and the Alpine foothills (Schweingruber and Ruoff 1979;Billamboz 2003), the Netherlands (Jansma 1995), NW Germany (Eckstein et al 1979), and W Germany (Hollstein 1980) to Estonia (Lääne-laid et al 2008;Sohar et al 2014) in the east. This work has resulted in the development of the longest continuous oak tree-ring chronology in the world, which spans the last 10,489 years (Friedrich et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Bridging the Gaps in Tree-Ring Records: Creating a High-Resolution Dendrochronological Network for Southeastern Europe

et al. 2014

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Dendrochronological research in North-Central Europe and the East Mediterranean has produced networks of long regional oak (Quercus sp.) reference chronologies that have been instrumental in dating, provenancing, and paleoclimate research applications. However, until now these two important tree-ring networks have not been successfully linked. Oak forests and historical/archaeological sites in southeastern Europe provide the key for linking the North-Central European and East Mediterranean tree-ring networks, but previous dendrochronological research in this region has been largely absent. This article presents the initial results of a project, in which we have built oak tree-ring chronologies from forest sites and historical/archaeological sites along a north-south transect between Poland and northwestern Turkey, with the aim of linking the North-Central European and East Mediterranean tree-ring networks and creating a new pan-European oak data set for dendrochronological dating and paleoclimatic reconstruction. Correlation among tree-ring chronologies and the spatial distribution of their teleconnections are evaluated. The southeastern European chronologies provide a solid bridge between both major European dendrochronological networks. The results indicate that a dense network of chronologies is the key for bridging spatial and temporal gaps in tree-ring records. Dendrochronological sampling should be intensively continued in southeastern Europe because resources for building long oak chronologies in the region are rapidly disappearing.

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Dendroclimatic signals of pedunculate oak (Quercus robur L.) in Estonia

Cited by 32 publications

References 53 publications

Identification of meteorological conditions in the growth of Robinia pseudoacacia on the basis of pointer years in urban conditions

Identification of meteorological conditions in the growth of Robinia pseudoacacia on the basis of pointer years in urban conditions

Impact of Climate Trends and Drought Events on the Growth of Oaks (Quercus robur L. and Quercus petraea (Matt.) Liebl.) within and beyond Their Natural Range

Bridging the Gaps in Tree-Ring Records: Creating a High-Resolution Dendrochronological Network for Southeastern Europe

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