Growth Dynamics of Conifer Tree Rings

2006 ◽  
Keyword(s):  
Tree Rings ◽  
Growth Dynamics ◽  
Conifer Tree

scholarly journals Variability in Elemental Composition of Conifer Tree Rings

2021 ◽  
pp. 24-37
Author(s):  
Vladimir L. Gavrikov ◽  
◽  
Alexey I. Fertikov ◽  
Evgenii A. Vaganov ◽  
Keyword(s):  
Elemental Composition ◽  
Tree Rings ◽  
Chemical Elements ◽  
Dimensional Space ◽  
Siberian Larch ◽  
Growth Conditions ◽  
Pinus Sibirica ◽  
Siberian Spruce ◽  
Long Term Experiment ◽  
Conifer Tree

Distribution of chemical elements in tree rings bears important information on various biogeochemical processes. In order to achieve a reliable interpretation of the information, it is necessary to know the degree of variation in the content of chemical elements both at the level of the entire species and at the level of individual trees. The research aims to determine which chemical elements have a stable distribution in the trunks of a number of conifers: Siberian spruce (Picea obovata Ledeb.), Scots pine (Pinus sylvestris L.), Siberian larch (Larix sibirica Ledeb.), and Siberian pine (Pinus sibirica Du Tour). The data for the analysis were obtained on the basis of the long-term experiment in forest growing. The experimental site was laid out in 1971–1972 in the vicinity of Krasnoyarsk by the staff of the Sukachev Institute of Forest of the Siberian Branch of the Russian Academy of Sciences. Before planting the seedlings, the soil ground was mechanically levelled, and thus, sufficiently equal growth conditions were created for all plantings. Cores with a diameter of 12 mm were sampled from three normally developing trees of each species and analyzed using modern X-ray fluorescence methods. Content relative values of elements (counts) were obtained with the Itrax Multiscanner (COX Analytical Systems). The content of elements in the tree rings was characterized by the concentration and reserve of elements. Concentration was calculated as the number of counts per 1 mm2 of the ring area; reserve was calculated as the number of counts over the entire ring area. Each of these variables was defined by the parameters of linear slope in the calendar year series and the standard deviation. The cluster analysis was performed in the 4-dimensional space of the obtained parameters. This allowed determining whether the series of element distributions from different trees and species are grouped. Three elements (Ca, Co, and P) show high stability of distribution parameters in tree rings with no regard to tree species. A number of other elements (Mn, Pb, Cl, Cr, Ni, Sr, and W) are stably grouped depending on the species. The results of the research enable to focus on the study of the elements stably distributed in the conifer trunks. For citation: Gavrikov V.L., Fertikov A.I., Sharafutdinov R.A., Vaganov E.A. Variability in Elemental Composition of Conifer Tree Rings. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 6, pp. 24–37. DOI: 10.37482/0536-1036-2021-6-24-37

scholarly journals X-ray imaging and computed tomography of conifer tree rings for climatological purposes

2018 ◽  
Vol 211 ◽  
pp. 012044
Author(s):  
S L Bondarenko ◽  
A V Batranin ◽  
S V Smirnov ◽  
S G Stuchebrov
Keyword(s):  
Computed Tomography ◽  
Tree Rings ◽  
X Ray ◽  
X Ray Imaging ◽  
Conifer Tree

Heterogeneous responses of main conifer tree rings to the abrupt warming around 1995 in Markang, Sichuan, China

2015 ◽  
Vol 35 (22) ◽  
Author(s):  
郭明明 GUO Mingming ◽  
张远东 ZHANG Yuandong ◽  
王晓春 WANG Xiaochun ◽  
黄泉 HUANG Quan ◽  
杨素香 YANG Suxiang ◽  
...  
Keyword(s):  
Tree Rings ◽  
Conifer Tree

Reflected-light image analysis of conifer tree rings for reconstructing climate

The Holocene ◽  
1996 ◽  
Vol 6 (1) ◽  
pp. 62-68 ◽  
Author(s):  
Paul R. Sheppard ◽  
Lisa J. Graumlich ◽  
Laura E. Conkey
Keyword(s):  
Image Analysis ◽  
Tree Rings ◽  
Light Image ◽  
Reflected Light ◽  
Conifer Tree

scholarly journals Isometric scaling to model water transport in conifer tree rings across time and environments

2020 ◽  
Author(s):  
Irina V Sviderskaya ◽  
Eugene A Vaganov ◽  
Marina V Fonti ◽  
Patrick Fonti
Keyword(s):  
Tree Rings ◽  
Environmental Conditions ◽  
Hydraulic Properties ◽  
Anatomical Variations ◽  
Plant Responses ◽  
Cross Sectional ◽  
Substantial Impact ◽  
Xylem Structure ◽  
Bordered Pits ◽  
Conifer Tree

Abstract Xylem hydraulic properties determine the ability of plants to efficiently and safely provide water to their leaves. These properties are key to understanding plant responses to environmental conditions and to evaluating their fate under a rapidly changing climate. However, their assessment is hindered by the challenges of quantifying basic hydraulic components such as bordered pits and tracheids. Here we use isometric scaling between tracheids and pits morphology to merge partial hydraulic models of tracheid’s component to upscale properties at the tree-ring level in conifers trees. Our new model output is first cross-validated with literature and then applied to cell anatomical measurements from Larix sibirica tree-rings formed under harsh conditions in southern Siberia to quantify the intra- and inter-annual variability in hydraulic properties. The model provides a means of assessing how different-sized tracheid’s components contribute to the hydraulic properties of the ring. Up-scaled results indicate that natural inter- and intra-ring anatomical variations have a substantial impact on the tree’s hydraulic properties. Our model facilitates the assessment of important xylem functional attributes because it only requires the more accessible measures of cross-sectional tracheid size. This approach, if applied to dated tree-rings, provides a novel way to investigate xylem structure-function relations across time and environmental conditions.

Cristal-growth dynamics of n-doped gaAs

1992 ◽  
Vol 50 (2) ◽  
pp. 1544-1545
Author(s):  
Pham V. Huong ◽  
Stéphanie Bouchet ◽  
Jean-Claude Launay
Keyword(s):  
Crystal Growth ◽  
Spatial Resolution ◽  
Epitaxial Layer ◽  
Outer Surface ◽  
Gaas Substrate ◽  
Structural Modification ◽  
Growth Dynamics ◽  
Argon Laser ◽  
High Anisotropy ◽  
Crystal Gaas

Microstructure of epitaxial layers of doped GaAs and its crystal growth dynamics on single crystal GaAs substrate were studied by Raman microspectroscopy with a Dilor OMARS instrument equipped with a 1024 photodiode multichannel detector and a ion-argon laser Spectra-Physics emitting at 514.5 nm.The spatial resolution of this technique, less than 1 μm2, allows the recording of Raman spectra at several spots in function of thickness, from the substrate to the outer deposit, including areas around the interface (Fig.l).The high anisotropy of the LO and TO Raman bands is indicative of the orientation of the epitaxial layer as well as of the structural modification in the deposit and in the substrate at the interface.With Sn doped, the epitaxial layer also presents plasmon in Raman scattering. This fact is already very well known, but we additionally observed that its frequency increases with the thickness of the deposit. For a sample with electron density 1020 cm-3, the plasmon L+ appears at 930 and 790 cm-1 near the outer surface.

Bright sparks reveal invisible tree rings

Nature ◽  
2006 ◽  
Author(s):  
Quirin Schiermeier
Keyword(s):  
Tree Rings
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