scholarly journals New insights into the 21 November 2000 tsunami in West Greenland from analyses of the tree−ring structure of Salix glauca

2015 ◽  
Vol 36 (1) ◽  
pp. 51-65 ◽  
Author(s):  
Agata Buchwał ◽  
Witold Szczuciński ◽  
Mateusz C. Strzelecki ◽  
Antony J. Long
Keyword(s):  
Tree Ring ◽  
Thick Layer ◽  
Ring Structure ◽  
Control Site ◽  
Contributory Factor ◽  
Polar Regions ◽  
Ecosystem Recovery ◽  
West Greenland ◽  
Sand And Gravel ◽  
Salix Glauca

Abstract We test the application of dendrochronological methods for dating and assessing the environmental impacts of tsunamis in polar regions, using an example of the 21 Novem− ber 2000 landslide−generated tsunami in Vaigat Strait (Sullorsuaq Strait), West Greenland. The studied tsunami inundated a c. 130 m−wide coastal plain with seawater, caused erosion of beaches and top soil and covered the area with an up to 35 cm−thick layer of tsunami de− posits composed of sand and gravel. Samples of living shrub, Salix glauca (greyleaf wil− low) were collected in 2012 from tsunami−flooded and non−flooded sites. The tree−ring analyses reveal unambiguously that the tsunami−impacted area was immediately colonized during the following summer by rapidly growing shrubs, whilst one of our control site spec− imens records evidence for damage that dates to the time of the tsunami. This demonstrates the potential for dendrochronological methods to act as a precise tool for the dating of Arc− tic paleotsunamis, as well as rapid post−tsunami ecosystem recovery. The reference site shrubs were likely damaged by solifluction in the autumn 2000 AD that was triggered by high seasonal rainfall, which was itself a probable contributory factor to the tsunami−gener− ating landslide.

scholarly journals The significance of compression wood in restoration of the leader in Pinus sihestris L. damaged by moose (Alces alces). II. Structure of growth rings in regenerating stems in relation to juvenile wood formation

2015 ◽  
Vol 40 (2) ◽  
pp. 315-340 ◽  
Author(s):  
B. A. Molski
Keyword(s):  
Tree Ring ◽  
Tree Rings ◽  
Compression Wood ◽  
Juvenile Wood ◽  
Alces Alces ◽  
Wood Formation ◽  
Ring Structure ◽  
Growth Rings ◽  
Late Wood ◽  
Wood Compression

The corewood of pine ds very prone to compression wood formation, this changing the whole pattern of the tree ring structure and the siz.es of early and late wood. Compression wood always increases the formation of late wood at the expense of early wood. Tree rings with compression wood are generally wider than those without it, but there occur also tree rings wihout compression wood wider than those in which it is present, formed in the same year and in the same tree.

Late Quaternary Geological History of the Dead Sea Area, Israel

1993 ◽  
Vol 39 (1) ◽  
pp. 59-67 ◽  
Author(s):  
Y. Yechieli ◽  
M. Magaritz ◽  
Y. Levy ◽  
U. Weber ◽  
U. Kafri ◽  
...  
Keyword(s):  
Late Quaternary ◽  
Thick Layer ◽  
Time Frame ◽  
Dead Sea ◽  
Polar Regions ◽  
Geological History ◽  
The Holocene ◽  
History Of ◽  
The Dead ◽  
Sea Area

AbstractA 34.5 m borehole, which was drilled near the Dead Sea coast (altitude -394 m) in the southern part of the fan delta of Wadi Zeelim, reveals the geological history of that area from the latest Pleistocene to present. The depositional time frame is based on six 14C dates and two U-Th dates. An erosional (or nondepositional) period is implied by the hiatus between 21,100 yr B.P. (U-Th age, depth 33 m) and 11,315 yr B.P. (14C age, depth 32 m). A subsequent arid phase is recorded by a 6.5-m-thick layer of halite; based on 14C dates this phase relates to the abrupt Younger Dryas cold period reported in temperate to polar regions. The fragility of the environment in this region is indicated by the fact that the region experienced such a severe, short aridification phase (less than 1000 yr), evidence of which is found widely in the desert fringes of the Middle East and North Africa. The aragonite found in most of the Holocene section indicates that the well site was covered by the lake for most of the Holocene. Exceptions are the intervals at 0-3 and 10-14 m depths which represent low stands of the lake.

scholarly journals Comparison of Various Edge Detection Techniques in Tree Ring Structure

2014 ◽  
Vol 90 (19) ◽  
pp. 26-28
Author(s):  
P. MeenakshiSundari ◽  
S. Britto Ramesh Kumar
Keyword(s):  
Edge Detection ◽  
Tree Ring ◽  
Ring Structure ◽  
Detection Techniques

scholarly journals Effects of Climate Factors on the Tree-ring Structure of Cryptomeria japonica in Central Japan

2020 ◽  
Vol 66 (3) ◽  
pp. 117-127 ◽  
Author(s):  
Yu Hirano ◽  
Taku M. Saitoh ◽  
Eitaro Fukatsu ◽  
Hajime Kobayashi ◽  
Hiroyuki Muraoka ◽  
...  
Keyword(s):  
Tree Ring ◽  
Cryptomeria Japonica ◽  
Ring Structure ◽  
Climate Factors ◽  
Central Japan

scholarly journals Scots pine tree ring structure modifications and relation with climate

2016 ◽  
Vol 4 (2) ◽  
pp. 1-7
Author(s):  
Semeniuc Anca Ionela ◽  
Cristian Sidor ◽  
Ionel Popa
Keyword(s):  
Tree Ring ◽  
Scots Pine ◽  
Ring Structure ◽  
Pine Tree

scholarly journals Modelling the spatial crosstalk between two biochemical signals explains wood formation dynamics and tree-ring structure

2020 ◽  
Author(s):  
Félix P. Hartmann ◽  
Cyrille B. K. Rathgeber ◽  
Eric Badel ◽  
Meriem Fournier ◽  
Bruno Moulia
Keyword(s):  
Tree Ring ◽  
Internal Control ◽  
Radial Growth ◽  
Wood Formation ◽  
Ring Structure ◽  
Xylem Differentiation ◽  
Formation Dynamics ◽  
Characteristic Features ◽  
One Year ◽  
Auxin Polar Transport

AbstractIn conifers, xylogenesis produces during a growing season a very characteristic tree-ring structure: large thin-walled earlywood cells followed by narrow thick-walled latewood cells. Although many factors influence the dynamics of differentiation and the final dimensions of xylem cells, the associated patterns of variation remain very stable from one year to the next. While radial growth is characterised by an S-shaped curve, the widths of xylem differentiation zones exhibit characteristic skewed bell-shaped curves. These elements suggest a strong internal control of xylogenesis. It has long been hypothesised that much of this regulation relies on a morphogenetic gradient of auxin. However, recent modelling works have shown that while this hypothesis could account for the dynamics of stem radial growth and the zonation of the developing xylem, it failed to reproduce the characteristic tree-ring structure. Here we investigated the hypothesis of a regulation by a crosstalk between auxin and a second biochemical signal, using dynamical modelling. We found that, in conifers, such a crosstalk is sufficient to simulate the characteristic features of wood formation dynamics, as well as the resulting tree-ring structure. In this model, auxin controls cell enlargement rates while another signal (e.g., cytokinin, TDIF) drives cell division and auxin polar transport.HighlightA dynamical model proves that two interacting signals (auxin, plus a cytokinin or the TDIF peptide) can drive wood formation dynamics and tree-ring structure development in conifers.

scholarly journals Evaluation of Thinning Efficiency in Pineries of Dry Forest Sites of the Kazakh Uplands

2021 ◽  
pp. 45-55
Author(s):  
Anastasiya Dancheva ◽  
◽  
Vladislav Pankratov ◽  
Keyword(s):  
Tree Ring ◽  
High Intensity ◽  
Radial Growth ◽  
Control Site ◽  
Dry Forest ◽  
Pine Forests ◽  
Forest Plantations ◽  
Thinning Intensity ◽  
Forest Sites ◽  
Dry Conditions

According to the current Forest Code of the Republic of Kazakhstan, in the forest plantations of specially protected natural areas, the main forestry measures aimed at the conservation and enhancement of the protective functions of forests are intermediate felling, that is, thinning. Pinus sylvestris L. is one of the main forest-forming species in Kazakhstan. Increasing the stability of forest plantations and the possibility of forming recreationally attractive landscapes through thinning is an urgent problem for plantations growing in arid conditions. The research purpose is to analyze the effectiveness of thinning of high intensity in dry pine forests of the Kazakh Uplands for a 70-year period, using dendrochronological methods. It was proved that in dense pine forests growing in dry conditions, there is an increase in radial growth in each subsequent 10-year period after thinning. It was found with statistical certainty that the greatest response to changes caused by thinning of high intensity was observed between 1949 and 1960. Analysis of indexed tree-ring chronologies using regional curves (indexed average tree-ring chronologies of pine) using a cubic spline function revealed differences in pine radial growth indices from the site where thinning of high intensity were carried out and from the control site (time periods: 1947–1955, 1961–1970, 1981–1990, and 1995–2015). The data obtained show a positive effect of thinning of high intensity on the radial growth of trees in the considered pine forests. In dense pine forests of dry growing conditions of the Kazakh Uplands it is recommended to make 1 or 2 cuttings with thinning intensity of 25–35 % at the age of 20–25 and 40–50, respectively, with subsequent increment thinning.

scholarly journals Method to estimate the medullar rays angle in pieces of wood based on tree-ring structure: application to planks of Quercus petraea

2017 ◽  
Vol 52 (2) ◽  
pp. 519-539 ◽  
Author(s):  
Víctor Martínez-Martínez ◽  
María del Alamo-Sanza ◽  
María Menéndez-Miguélez ◽  
Ignacio Nevares
Keyword(s):  
Tree Ring ◽  
Quercus Petraea ◽  
Ring Structure
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