Growing of One-Year Containerized Seedlings of English Oak (Quercus Robur L.) with the Use of Various Nutritious Substrates

2017 ◽  
Vol 35 (3) ◽  
Author(s):  
Evgeny Romanov ◽  
Маrgarita Smyshlyaeva ◽  
Vitaliy Krasnov ◽  
Dmitry Mukhortov
Keyword(s):  
Quercus Robur ◽  
Containerized Seedlings ◽  
English Oak ◽  
One Year

scholarly journals Acorn size influence on the quality of pedunculate oak (Quercus robur L.) one-year old seedlings

REFORESTA ◽  
2019 ◽  
Author(s):  
Jovana Devetaković ◽  
◽  
Marina Nonić ◽  
Bojan Prokić ◽  
Vladan Popović ◽  
...  
Keyword(s):  
Quercus Robur ◽  
Pedunculate Oak ◽  
Acorn Size ◽  
One Year

Study on the impregnation quality of rubberwood (Hevea brasiliensis Müll. Arg.) and English oak (Quercus robur L.) sawn veneers after treatment with 1,3-dimethylol-4,5- dihydroxyethyleneurea (DMDHEU)

Holzforschung ◽  
2020 ◽  
Vol 74 (4) ◽  
pp. 362-371 ◽  
Author(s):  
Lukas Emmerich ◽  
Holger Militz
Keyword(s):  
Cell Wall ◽  
Hevea Brasiliensis ◽  
Quercus Robur ◽  
Weight Percent ◽  
Dynamic Indentation ◽  
Wood Modification ◽  
English Oak ◽  
Cell Wall Deposition ◽  
Lower Liquid

AbstractThe efficacy of chemical wood modification is closely related to the permeability of the wood species and the cell wall deposition of the reagent, causing a permanent swelling (“bulking effect”). This study aimed to analyze how rubberwood (Hevea brasiliensis Müll. Arg.) and English oak (Quercus robur L.) may be affected by chemical wood modification, although they are known to show either variations in permeability or being less permeable. Thin clear veneers were treated with 1,3-dimethylol-4,5- dihydroxyethyleneurea (DMDHEU) which resulted in significantly reduced moisture-induced swelling and increased the resistance to static and dynamic indentation loads. The results evidenced significantly lower liquid uptakes in English oak compared to rubberwood, which directly affected the weight percent gains (WPGs) and restricted the range for potential improvements of the material properties. Surprisingly, rubberwood showed a lower cell wall bulking, which, in comparison with English oak, indicated less DMDHEU monomers entering the cell walls and rather being located in the cell lumens. Atypical for treatments with cell wall penetration chemicals, no further decrease in maximum swelling (SM) was detected with increasing bulking in rubberwood specimens. English oak showed higher variations in DMDHEU distribution within treated veneers and between earlywood and latewood areas, effecting a less homogeneous performance.

Light and transmission electron microscopy of English oak ectomycorrhizal short roots

1984 ◽  
Vol 62 (7) ◽  
pp. 1327-1335 ◽  
Author(s):  
H. H. Edwards ◽  
R. V. Gessner
Keyword(s):  
Electron Microscopy ◽  
Cell Walls ◽  
Quercus Robur ◽  
Lipid Droplets ◽  
Apical Meristem ◽  
Fungal Symbiont ◽  
Host Root ◽  
Transmission Electron ◽  
Cell Layers ◽  
English Oak

The incorporation of caffeine in standard transmission electron microscope fixation procedures has allowed good preservation and embedment of ectomycorrhizal short roots of English oak (Quercus robur L.). In the mantle the most conspicuous structures are cystidia which radiate outwards from the surface. These conically shaped cells have knobs at their tips and thickened cell walls. The cystidia and other outer mantle cells contain many cytoplasmic constituents, whereas the inner mantle cells are nearly devoid of cytoplasm. The mantle cells are held together by an intercellular slime network. The Hartig net cells are filled with cytoplasm and contain numerous lipid droplets. Typical dolipore septa separate the cells; however, these cells have irregularly branched shapes. The host root tissue appears little altered by the presence of the fungal symbiont. However, the root cap consists of only a few cell layers. The apical meristem is functional as evidenced by the presence of newly divided cells and microtubules lining enlarging cells.

Electric resistivity tomography shows radial variation of electrolytes in Quercus robur

2010 ◽  
Vol 40 (6) ◽  
pp. 1189-1193 ◽  
Author(s):  
Dirk Bieker ◽  
Steffen Rust
Keyword(s):  
Moisture Content ◽  
Cross Section ◽  
Cross Sections ◽  
Quercus Robur ◽  
Distinct Pattern ◽  
Electric Resistivity ◽  
Wood Moisture Content ◽  
Wood Moisture ◽  
Resistivity Tomography ◽  
English Oak

Electric resistivity tomograms of English oak ( Quercus robur L.) show a very distinct pattern of electric resistivity that has not been found in any other tree species yet and that cannot be related to the distribution of wood moisture content over the stem cross section. To reveal the factors underlying this two-dimensional pattern of electric resistivity, the variation of specific gravity and wood moisture content was analyzed in 18 cross sections of six roadside English oak trees after electric resistivity tomography. pH and electrolyte content were analyzed in two representative cross sections. Results show that electric resistivity correlates neither with wood moisture content nor density. The steep increase in electric resistivity at the sapwood–heartwood boundary correlates well with decreasing pH, potassium, and magnesium. The decreasing electric resistivity within the heartwood of English oak correlates with potassium and magnesium, increasing from the sapwood–heartwood boundary to the pith. More research is needed to identify species-specific electric resistivity patterns and their main factors if the method is to be used to detect wood fungal decay, historical ground water contamination, or other influences that may change the pattern of electric resistivity in the stem cross section.

scholarly journals Assessment of english oak (Quercus robur L.) growth in varied soil-substrate conditions of reclaimed Piaseczno sulfur mine dump

2015 ◽  
Vol 57 (1) ◽  
pp. 28-32 ◽  
Author(s):  
Marcin Pietrzykowski ◽  
Wojciech Krzaklewski ◽  
Justyna Likus ◽  
Bartłomiej Woś
Keyword(s):  
Quercus Robur ◽  
Growth Parameters ◽  
Basal Area ◽  
Clay Content ◽  
Significant Negative Correlation ◽  
Mining Area ◽  
Good Growth ◽  
Tree Stand ◽  
Preliminary Identification ◽  
English Oak

Abstract This study presents selected tree stand features and stand productivity of the English oak (Quercus robur L.) growing in the conditions of a reclaimed external dump of Piaseczno sulfur mine in Tarnobrzeg mining area. Following 40 years of growth in the dump, the oak trees reached first and second bonitation class and good growth parameters. The oak obtained the highest stand volume and basal area on sandy soils and loamy-sand substrates. A significant negative correlation between high clay content in soil cores and tree stand parameters was observed, indicating unfavourable impact on tree growth. The results confirmed the usefulness of the English oak as the main (target) species in the conditions of sulfur dumps, and the suitability of its introduction with preliminary identification of micro-habitat differentiation.

scholarly journals The Preservation of English Oak in Marine Environments

2021 ◽  
Author(s):  
Wren Montgomery ◽  
Eleanor Schofield ◽  
Mark A. Sephton ◽  
Jonathan S. Watson
Keyword(s):  
Quercus Robur ◽  
Lignin Degradation ◽  
Marine Environments ◽  
English Oak ◽  
Age Range ◽  
Chemical Integrity

<p>This study compares the chemical integrity of English Oak (Quercus robur) samples with an age range of four centuries by analysing the lignin degradation. The samples were collected from four historic British vessels and thus represent samples of diverse ages which have nonetheless experienced similar non-arboreal environments. We conclude that the Mary Rose, the oldest vessel studied and the recipient of the most intensive conservation efforts, has been well-preserved through treatment with PEG, and we present a baseline for assessing whether a ship has been biologically degraded.</p><p><br></p><p>The work combines quantitative analytic chemistry techniques (e.g., THM-GC-MS) with the conservation of large historic artifacts.</p>

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