scholarly journals Different climate response of three tree ring proxies of Pinus sylvestris from the Eastern Carpathians, Romania

2019 ◽  
Vol 54 ◽  
pp. 56-63 ◽  
Author(s):  
Viorica Nagavciuc ◽  
Cătălin-Constantin Roibu ◽  
Monica Ionita ◽  
Andrei Mursa ◽  
Mihai-Gabriel Cotos ◽  
...  
Keyword(s):  
Pinus Sylvestris ◽  
Tree Ring ◽  
Climate Response ◽  
Eastern Carpathians

scholarly journals Different climate response of three tree ring proxies of Pinus sylvestris from the Eastern Carpathians, Romania

2020 ◽  
Author(s):  
Viorica Nagavciuc ◽  
Cătălin-Constantin Roibu ◽  
Monica Ionita ◽  
Andrei Mursa ◽  
Mihai-Gabriel Cotos ◽  
...  
Keyword(s):  
Pinus Sylvestris ◽  
Tree Ring ◽  
Ring Width ◽  
Maximum Temperature ◽  
Daily Maximum Temperature ◽  
Daily Maximum ◽  
Climate Data ◽  
Maximum Latewood Density ◽  
Latewood Density ◽  
Eastern Carpathians

<p>The aim of this study was to compare the climatic responses of three tree rings proxies: tree ring width (TRW),<br>maximum latewood density (MXD), and blue intensity (BI). For this study, 20 cores of Pinus sylvestris covering<br>the period 1886–2015 were extracted from living non-damaged trees from the Eastern Carpathian Mountains<br>(Romania). Each chronology was compared to monthly and daily climate data. All tree ring proxies had a<br>stronger correlation with the daily climate data compared to monthly data. The highest correlation coefficient<br>was obtained between the MXD chronology and daily maximum temperature over the period beginning with the<br>end of July and ending in the middle of September (r=0.64). The optimal intervals for the temperature signature<br>were 01 Aug – 24 Sept for the MXD chronology, 05 Aug – 25 Aug for the BI chronology, and both 16 Nov<br>of the previous year – 16 March of the current year and 15 Apr – 05 May for the TRW chronology. The results<br>from our study indicate that MXD can be used as a proxy indicator for summer maximum temperature, while<br>TRW can be used as a proxy indicator for just March maximum temperature. The weak and unstable relationship<br>between BI and maximum temperature indicates that BI is not a good proxy indicator for climate reconstructions<br>over the analysed region.</p>

scholarly journals ABSOLUTE DENDROCHRONOLOGICAL SCALE FOR PINE (PINUS SYLVESTRIS L.) FROM UJŚCIE (NW POLAND), DATED USING RAPID ATMOSPHERIC 14C CHANGES

Radiocarbon ◽  
2020 ◽  
pp. 1-10
Author(s):  
Marek Krąpiec ◽  
Andrzej Rakowski ◽  
Jacek Pawlyta ◽  
Damian Wiktorowski ◽  
Monika Bolka
Keyword(s):  
High Resolution ◽  
Pinus Sylvestris ◽  
Middle Ages ◽  
Tree Ring ◽  
Tree Rings ◽  
Matching Method ◽  
Early Middle Ages ◽  
Rapid Changes ◽  
Absolute Age ◽  
Nw Poland

ABSTRACT Radiocarbon (14C) analyses are commonly used to determine the absolute age of floating tree-ring chronologies. At best, with the wiggle-matching method, a precision of 10 years could be achieved. For the early Middle Ages, this situation has been markedly improved by the discovery of rapid changes in atmospheric 14C concentrations in tree-rings dated to 774/775 and 993/994 AD. These high-resolution changes can be used to secure other floating tree-ring sequences to within 1-year accuracy. While a number of studies have used the 774 even to secure floating tree-ring sequences, the less abrupt 993 event has not been so well utilized. This study dates a floating pine chronology from Ujście in Wielkopolska (Greater Poland) (NW Poland), which covers the 10th century period and is critical for studies on the beginning of the Polish State to the calendar years 859–1085 AD using the changes in single year radiocarbon around 993/4 AD.

scholarly journals Effect of the outbreak of horse-chestnut leaf miner (Cameraria ohridella Deschka & Dimić) on tree-ring width in common horse-chestnut (Aesculus hippocastanum L.)

2021 ◽  
Author(s):  
Anna Cedro ◽  
Grzegorz Nowak
Keyword(s):  
Growth Rate ◽  
Tree Ring ◽  
Insect Pest ◽  
Ring Width ◽  
Leaf Miner ◽  
Horse Chestnut ◽  
Climate Response ◽  
Tree Ring Width ◽  
Temperature And Precipitation ◽  
Chestnut Leaf

Abstract Common horse-chestnut is frequently infested by the insect pest horse-chestnut leaf miner [HCLM; Cameraria ohridella (Deschka & Dimić, 1986), Gracillariidae, Lepidoptera]. The larvae, feeding on leaf parenchyma, cause browning and dehydration of leaves, which may be shed as early as in summer. The major aims of this study were: (1) to assess the effect of infestation by HCLM on ring-width dynamics in common horse-chestnut; (2) to determine the date of invasion of the pest; and (3) to compare the growth-climate response in the period before and after the invasion of HCLM. In 2017 in north-western Poland, samples from 30 horse-chestnut trees for the dendrochronological analysis were taken with help of a Pressler increment borer. The ring-width chronology was developed using standard dendrochronological methods. Dendroclimatological analyses were made in 2 periods: before the determined date of HCLM invasion (till the year 1999) and after the invasion (in 20002016). In 2000, in spite of favourable weather conditions, a reduced growth rate was observed in 91% of the analysed trees. The period of strong reductions lasted till 2010. Before the invasion, radial growth rate was dependent on temperature and precipitation in May and June of the current year, whereas after the invasion, the growth-climate response was dependent on temperature and precipitation in the preceding year and the correlation was stronger. Surprisingly, in recent years (2011–2016), in spite of infestation by HCLM every year, the health condition of the analysed trees has improved and tree-ring width has increased.

Do tree ring δ13C series from Pinus sylvestris in northern Fennoscandia contain long-term non-climatic trends?

2008 ◽  
Vol 252 (1-2) ◽  
pp. 42-51 ◽  
Author(s):  
Mary Gagen ◽  
Danny McCarroll ◽  
Iain Robertson ◽  
Neil J. Loader ◽  
Risto Jalkanen
Keyword(s):  
Pinus Sylvestris ◽  
Tree Ring ◽  
Climatic Trends ◽  
Northern Fennoscandia

Seasonal shift in the climate responses of Pinus sibirica, Pinus sylvestris, and Larix sibirica trees from semi-arid, north-central Mongolia

2011 ◽  
Vol 41 (6) ◽  
pp. 1242-1255 ◽  
Author(s):  
Louis De Grandpré ◽  
Jacques C. Tardif ◽  
Amy Hessl ◽  
Neil Pederson ◽  
France Conciatori ◽  
...  
Keyword(s):  
Pinus Sylvestris ◽  
Tree Ring ◽  
Growing Season ◽  
Larix Sibirica ◽  
Pinus Sibirica ◽  
North Central ◽  
Central Mongolia ◽  
False Rings ◽  
Seasonal Shift ◽  
Semi Arid

In light of a significant increase in the warming trend observed in recent decades in semi-arid Mongolia, tree-ring attributes and anomalies were analysed to detect potential changes in the growth–climate relationship. In a moisture-limited environment, an increase in temperature could cause a shift in the seasonal response of trees to climate. Chronologies were developed for the dominant tree species (Larix sibirica Ledeb., Pinus sibirica Du Tour, and Pinus sylvestris L.) from north-central Mongolia. In addition to annual ring width, both earlywood and latewood width were measured, and tree-ring anomalies such as false rings and light rings were systematically identified. Earlywood width was mainly associated with precipitation in the year prior to ring formation and early growing season conditions. Temperature was associated with current year growth and mainly influenced latewood development. False rings were good indicators of early summer droughts, whereas light rings were mainly associated with a cold end of summer. A seasonal shift in the significance of monthly climate variables was observed in recent decades. This displacement presumably resulted from changes in the timing and duration of the growing season. Tree growth starts earlier in spring and is now affected by late summer to early autumn climate conditions.

scholarly journals Climate response of tree-ring width in Larix sibirica growing in the drought-stressed forest-steppe ecotone of northern Mongolia

2011 ◽  
Vol 68 (2) ◽  
pp. 275-282 ◽  
Author(s):  
Choimaa Dulamsuren ◽  
Markus Hauck ◽  
Hanns Hubert Leuschner ◽  
Christoph Leuschner
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Larix Sibirica ◽  
Forest Steppe ◽  
Climate Response ◽  
Tree Ring Width ◽  
Northern Mongolia

Reconstructing snow-avalanche activity with tree rings in Maramureş Mountains (Eastern Carpathians, Romania)

2020 ◽  
Author(s):  
Armelle Decaulne ◽  
Ionela-Georgiana Răchită ◽  
Mihai Hotea ◽  
Vasile Timur Chiş ◽  
Olimpiu Traian Pop
Keyword(s):  
Tree Ring ◽  
Tree Rings ◽  
Climatic Factors ◽  
Climatic Conditions ◽  
Snow Avalanche ◽  
Snow Avalanches ◽  
Joint Research ◽  
Eastern Carpathians ◽  
Joint Research Project ◽  
Callus Tissues

<p> <span>Snow avalanches </span>represent a common phenomenon <span>in Maramureş Mountains (Eastern Carpathians, Romania)</span> where they <span>occur frequently on higher steep slopes and reach in the runout zones the valley bottoms below 1000 m a.s.l. The presence of particular topo-climatic conditions influences the patterns of avalanche activity in terms of past frequency and spatial extent along the slope valleys. As the past snow-avalanche activity is not documented by written reports in the area, reliable information about avalanche history is missing. </span>However, the slopes are forested, trees repeatedly disturbed by snow avalanches record evidence of past events. <span>For this study we reconstructed the avalanche activity using tree rings as a source of proxy data. To date the snow-avalanche history, dendrochronological investigations have been carried out in two avalanche paths, along which living trees showed clear external signs of past disturbances related to mechanical impacts produced by snow avalanches. In each investigated path, a total number of 52 and respectively 118 trees have been sampled and their spatial position recorded with a GPS device. Tree-growth </span>anomalies (e.g. scars, callus tissues, the onset sequences of tangential rows of traumatic resin ducts, compression wood, growth suppression and release sequences) <span>related to snow avalanche disturbance identified within tree rings served to reconstruct past events with an annual resolution. The results indicate that, apart the 2005 major event witnessed and also confirmed by tree-ring dating, multiple other events have been reconstructed since the beginning of 20</span><sup><span>th</span></sup><span> century. Despite some inherent limitations of tree-ring methods in reconstructing past avalanche events, these dendrochronological investigations confirm their utility in deciphering the patterns of avalanche activity in Maramureş Mountains. Tree-ring studies contribute to a better understanding of the role of topographical and climatic factors which influence the spatio-temporal occurrence of snow avalanches.</span></p><p><span>This study represents a contribution to the joint research project 09-AUF, </span><span>‘‘</span><span><em>Activité des avalanches de neige dans les Carpates Orientales Roumaines et Ukrainiennes - </em></span><span> ACTIVNEIGE</span><span>’’</span><span>, co-funded by the </span><span><em>Agence Universitaire de la Francophonie (AUF)</em></span><span> and </span><span><em>Institutul de Fizică Atomică (IFA), Romania</em></span><span>.</span></p>

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