scholarly journals The Climatic Response of Tree Ring Width Components of Ash (Fraxinus excelsior L.) and Common Oak (Quercus robur L.) from Eastern Europe

Forests ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 600
Author(s):  
Cătălin-Constantin Roibu ◽  
Victor Sfeclă ◽  
Andrei Mursa ◽  
Monica Ionita ◽  
Viorica Nagavciuc ◽  
...  
Keyword(s):  
Eastern Europe ◽  
Tree Ring ◽  
Quercus Robur ◽  
Ring Width ◽  
Fraxinus Excelsior ◽  
Drought Indices ◽  
Climatic Data ◽  
Climatic Response ◽  
Republic Of Moldova ◽  
The Republic

This paper aims to develop the first differentiated (earlywood—EW, latewood—LW, and total ring width—RW) dendrochronological series for ash (Fraxinus excelsior L.) and oak (Quercus robur L.) trees from the Republic of Moldova, and to analyze their climatic response and their spatio-temporal stability. For this, 18 ash and 26 oak trees were cored from the Dobrușa protected area, Republic of Moldova, Eastern Europe, and new EW, LW, and RW chronologies were developed for ash and oak covering the last century. The obtained results showed that the RW and LW have a similar climatic response for both species, while EW is capturing interannual climate variations and has a different reaction. The analyses performed with monthly climatic data revealed a significant and negative correlation with the mean air temperature and a significant and positive correlation with precipitation and the Standardized Precipitation-Evapotranspiration Index (SPEI) for both ash and oak. The temperature during the vegetation period has a strong influence on all tree-ring components of ash, while for oak the strong correlation was found only for LW. The positive and significant correlation between LW and RW with precipitation for both species, suggests that ash and oak are sensitive to the hydrological component and the precipitation is the main tree growth-limiting factor. Despite the significant correlation with precipitation and temperature for the whole analyzed period, the 25-year moving correlation analyses show that they are not stable in time and can switch from positive to negative or vice versa, while the correlation with SPEI3 drought index, which is a integration of both climatic parameters, is stable in time. By employing the stability map analysis, we show that oak and ash tree ring components, from the eastern part of the Republic of Moldova, have a stable and significant correlation with SPEI3 and scPDSI drought indices from February (January) until September, over the eastern part of Europe.

scholarly journals Tree-ring width and Variation of Wood Density in Fraxinus excelsior L. and Quercus robur L. Growing in Floodplain Forests

BioResources ◽  
2017 ◽  
Vol 13 (1) ◽  
Author(s):  
Kyriaki Giagli ◽  
Jan Baar ◽  
Marek Fajstavr ◽  
Vladimír Gryc ◽  
Hanuš Vavrčík
Keyword(s):  
Tree Ring ◽  
Wood Density ◽  
Quercus Robur ◽  
Ring Width ◽  
Fraxinus Excelsior ◽  
Floodplain Forests ◽  
Tree Ring Width

Republic of Moldova in the Context of Regional Security Challenges in Eastern Europe

2018 ◽  
pp. 299-304
Author(s):  
Stefan Tibuleac
Keyword(s):  
Eastern Europe ◽  
Security Policy ◽  
Security System ◽  
Regional Security ◽  
Strategic Uncertainty ◽  
European Security ◽  
Republic Of Moldova ◽  
The Republic ◽  
The Impact

This article analyzes the most current security issues for the Republic of Moldova that are part of the regional security context of Eastern Europe –the region that can be considered the epicenter of international tensions through which the„geopolitical line of fracture”passes. The geographical position of the Republic of Moldova makes this state particularly sensitive to any negative trends in theregion. Growing of international tensions creates security threats and complicates economic development. From a historical point of view, Moldova has repeatedly fallen victim by the confrontation of the great powers. Therefore, the Republic of Moldova has a vital interest in preventing a new conflict in Eastern Europe. This article is based on a number of assumptions made by changes in the European security environment, such as the „shift of weight” to the East, strategic uncertainty, increasing the role of non-state actors, the situation in eastern Ukraine, etc. Based on these assumptions, this article makes an attempt to outline the potential role of the Republic of Moldova in the Eastern European security system, taking into account the desideratum for integration of the republic into the European Union. Other relevant factors will be taken into account for shaping the role of the Republic of Moldova in the European security system, namely: the security deficit; the impact of NATO and EU security policy; the rebirth of the project to create a regional defense alliance, etc. This article will largely take into account the military aspects of security. Keywords: Republic of Moldova, national security, Eastern Europe, NATO, Intermarium, defence, threats, risks, challenges

scholarly journals The Relationship between Tree-Ring Growths of Pinus densiflora and Climate from Three Mountains in Central Region, the Republic of Korea

Atmosphere ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 878
Author(s):  
Chang-Hyun Park ◽  
Ui-Cheon Lee ◽  
Soo-Chul Kim ◽  
Kwang-Hee Lee
Keyword(s):  
Tree Ring ◽  
National Parks ◽  
Central Region ◽  
Climatic Factors ◽  
Pinus Densiflora ◽  
Ring Width ◽  
Republic Of Korea ◽  
Logarithmic Curve ◽  
The Republic ◽  
The Relationship

To analyze the relationship between climatic factors (monthly mean temperature and total precipitation) and tree-ring growths of Pinus densiflora from the central region of the Republic of Korea, more than 20 trees were sampled from three national parks. The tree-ring chronology of Mt. Bukhan covering the period of 1917–2016 was assessed, as well as that of Mt. Seorak across 1687–2017 and Mt. Worak across 1777–2017. After cross-dating, each ring-width series was double-standardized by first fitting a logarithmic curve and then a 50 year cubic spline. Climate-growth relationships were computed with bootstrap correlation functions. The result of the analysis showed a positive response from the current March temperature and May precipitations for tree-ring growth of Pinus densiflora. It indicates that a higher temperature supply during early spring season and precipitation during cambium activity are important for radial growths of Pinus densiflora from the central region in the Republic of Korea.

Relatii temporale între parametrii climatici si cresterile anuale ale speciilor forestiere (studiu de caz)

2019 ◽  
Author(s):  
Maria Nedealcov ◽  
◽  
Ala Donica ◽  
Ion Agapi ◽  
Nicolae Grigoras ◽  
...  
Keyword(s):  
Climatic Factors ◽  
Growth Parameters ◽  
Ring Width ◽  
Aridity Index ◽  
Quercus Petraea ◽  
Distribution Area ◽  
Natural Distribution ◽  
Annual Ring Width ◽  
Republic Of Moldova ◽  
The Republic

The forests on the natural distribution area from the silvosteppe zone, under the influence of climate change will experience major changes in their structure and functioning. The analysis of growth parameters for Fraxinus excelsior, Quercus petraea, Q. robur in three experimental areas from center of the Republic of Moldova indicates that the radial growth processes are influenced by the same complex of climatic factors, which differ being dendroclimatic response intensity. It has been shown that between the annual tree growth and forest aridity index - FAI, there are close correlations: the higher FAI values indicate the lower annual growth of the trees, and vice versa, low FAI values identify good development conditions of the stands (higher increases in the annual ring width).

scholarly journals The influence of climatic conditions on the tree-ring width of wild service trees (Sorbus torminalis L.) in Wielkopolska

2016 ◽  
Vol 77 (2) ◽  
pp. 117-123 ◽  
Author(s):  
Anna Cedro
Keyword(s):  
Tree Ring ◽  
Negative Impact ◽  
Positive Impact ◽  
Ring Width ◽  
Climatic Conditions ◽  
Climatic Data ◽  
Pointer Years ◽  
The North ◽  
Sorbus Torminalis ◽  
Temperature And Precipitation

AbstractThe wild service tree (Sorbus torminalis L.) is a very rare tree species in Poland, where it reaches the north-eastern border of its natural range. The majority of this species’ stands is found in Wielkopolska. This study was aimed at examining the relationships between the growth and climate for trees of the species Sorbus torminalis L. growing in the Wielkopolska National Park and the Pniewy forest district (Wielkopolska). The samples for the analysis were taken from 63 trees. However, taking into account the missing growth rings and the difficult identification of the tree ring borders in sapwood, only ca. 30% of the samples could be synchronised and dated accurately. Applying the classic methods of dendrochronological dating, a 94- year STW chronology was constructed, spanning the years of 1920-2013. The chronology, in turn, was used as a basis for dendroclimatological analyses, including correlation, response function, and pointer years. The climatic data used in the analyses came from the meteorological station in Poznań; providing air temperature and precipitation for a period of 66 years (1948-2013) and 48 years of insolation data (1966-2013). Insolation had the highest negative impact and precipitation had the highest positive impact on the annual growth in May and June. Positive pointer years could be linked to humid months with low insolation during the growing season, while negative pointer years are characterised by deficient precipitation, a large number of sunny hours, and high air temperatures in the summer months.

A COMPARISON OF TREE-RING FEATURES IN PICEA ABIES AS CORRELATED WITH CLIMATE

IAWA Journal ◽  
2000 ◽  
Vol 21 (4) ◽  
pp. 403-416 ◽  
Author(s):  
Rupert Wimmer ◽  
Michael Grabner
Keyword(s):  
Picea Abies ◽  
Tree Ring ◽  
Ring Width ◽  
Climatic Conditions ◽  
Climatic Data ◽  
Indirect Measure ◽  
Resin Duct ◽  
Temperature And Precipitation ◽  
Latewood Density ◽  
Highly Correlated

This paper presents an analysis of 16 anatomical variables measured on 20 spruce trees [Picea abies (L.) Karst.] from sites in the managed forest district Seyde, Eastern Ore Mountains, south of Dresden, Germany. Ring width and latewood proportion did not show significant relationships with monthly climatic data, whereas maximum density, latewood cell-wall proportion and latewood density were highly correlated with temperature and precipitation. The climatic signals expressed in resin duct density, ray height, tracheid length and microfibril angles were less pronounced. Of 16 tree-ring parameters, densitometry – as an indirect measure of xylem anatomy – has again shown its great potential to record climatic conditions.

scholarly journals Exceptional floods in the Prut basin, Romania, in the context of heavy rains in the summer of 2010

2016 ◽  
Author(s):  
Gheorghe Romanescu ◽  
Cristian Constantin Stoleriu
Keyword(s):  
Czech Republic ◽  
Eastern Europe ◽  
Central And Eastern Europe ◽  
The Czech Republic ◽  
Republic Of Moldova ◽  
Atmospheric Instability ◽  
The Republic ◽  
Gauging Station ◽  
Prut River ◽  
Heavy Rains

Abstract. The year 2010 was characterized by devastating flooding in Central and Eastern Europe, including Romania, the Czech Republic, Slovakia, and Bosnia-Herzegovina. This study focuses on floods that occurred during the summer of 2010 in the Prut River basin, which has a high percentage of hydrotechnical infrastructure. Strong floods occurred in eastern Romania on the Prut River, which borders the Republic of Moldova and Ukraine, and the Siret River. Atmospheric instability from 21 June–1 July 2010 caused significant amounts of rain, with rates of 51.2 mm/50 min and 42.0 mm/30 min. In the middle Prut basin, there are numerous ponds that help mitigate floods as well as provide water for animals, irrigation, and so forth. The peak discharge of the Prut River during the summer of 2010 was 2,310 m3/s at the Radauti Prut gauging station. High discharges were also recorded on downstream tributaries, including the Baseu, Jijia, Miletin etc. High discharges downstream occurred because of water from the middle basin and the backwater from the Danube (a historic discharge of 16,300 m3/s). The floods that occurred in the Prut basin in the summer of 2010 could not be controlled completely because the discharges far exceeded foreseen values.

Soil moisture as a reliable pedunculate oak (Quercus robur L.) radial growth driver

2021 ◽  
Author(s):  
Saša Kostić ◽  
Wolfgang Wagner ◽  
Tom Levanič ◽  
Tzvetan Zlatanov ◽  
Ernest Goršić ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Tree Ring ◽  
Radial Growth ◽  
Quercus Robur ◽  
Mixed Model ◽  
New Technologies ◽  
Ring Width ◽  
Correlation Technique ◽  
Pedunculate Oak ◽  
Tree Ring Width

<p>New technologies, such as satellites and sensors, provide a wealth of new information about all ecosystems. In dendrochronological studies, all drought-related factors are of great importance for a more comprehensive understanding of associations between radial growth and water loss. Soil moisture directly reflects the wetness of immediate root surroundings, which is vital to the water uptake by trees. Owing to the advances in satellite observation systems and sensors, soil moisture (SM) can be remotely measured, opening new window in dendrochronological research.</p><p>Using the pedunculate oak (Quercus robur L.) lowland SE Europe forests dataset, which count 23 stands and more than 300 tree ring width (TRW) series, we observed reliable associations between satellite-based SM and TRW. Specifically, we observed different TRW−SM patterns based on the precipitation regime. SM in the hottest months (July and August) boosted radial growth, whereas opposite results were noted in the wettest spring months oaks that growing in wetter stands. Unlike oaks from drier and wetter stands that exhibited strong response to SM, those growing on moderately wet (optimal) stands are less sensitive to SM, making these stands optimal oak surroundings.</p><p>On the other hand, by applying a Generalized Additive Mixed Model (GAMM), we noted moderate−weak interactions between TRW series and smoothed SM timescales, with stronger deviations in extreme dry/wet years. Based on the TRW sensitivity to SM findings, which were interpreted via Pearson’s correlation technique and GAMM modeling, strong relations can be inferred, and SM can be labelled as reliable pedunculate oak driver.</p><p><strong>Keywords:</strong> Forestry, Remote sensing, Dendrochronology, Soil moisture, Pedunculate oak, GAMM</p><p><strong>Acknowledgments:</strong> This research was supported by the Science Fund of the Republic of Serbia, PROMIS, #6066697, TreeVita.</p><p><strong>Note:</strong> This contribution is a summary of a study by Kostić S, Wagner W, Orlović S, Levanič T, Zlatanov T, Goršić E, Kesić L, Matović B, Tsvetanov N, Stojanović DB. Different tree-ring width sensitivities to satellite-based soil moisture from drier, moderate and wetter pedunculate oak (Quercus robur L.) stands across a southeastern distribution margin (In press)</p>

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