scholarly journals Évolution de la croissance radiale du hêtre (Fagus silvatica L) dans les Vosges. Premiers résultats sur le versant lorrain

1995 ◽  
Vol 52 (1) ◽  
pp. 11-21 ◽  
Author(s):  
JF Picard
Keyword(s):  
Fagus Silvatica

Analysis of variations in and correlations between selected physical parameters of common beech (Fagus silvatica L.) nuts

2017 ◽  
Vol 1 (21) ◽  
pp. 49-63
Author(s):  
Zdzisław Kaliniewicz ◽  
Piotr Markowski ◽  
Andrzej Anders ◽  
Paweł Tylek ◽  
Zbigniew Krzysiak ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Correlation Analysis ◽  
Cross Sections ◽  
Linear Regression Analysis ◽  
Physical Parameters ◽  
Common Beech ◽  
Mesh Screen ◽  
Before And After ◽  
Fagus Silvatica ◽  
Highly Correlated

The basic dimensions and the mass of common beech nuts and seeds from five nut batches, harvested from tree stands in northern Poland, were determined. Environmental conditions had a greater influence on seed plumpness than the age of tree stands. The results of measurements were analyzed statistically by analysis of variance, correlation analysis and linear regression analysis. Despite differences in their plumpness, nuts were characterized by nearly identical cross-sections which resembled an equilateral triangle. The thickness of nuts and seeds was highly correlated with their mass, and this information can facilitate seed husking and separation into mass categories. Before and after husking, seeds should be separated with the use of a mesh screen with longitudinal openings. Medium-sized (most numerous) seeds were separated into the following plumpness categories using a screen separator with ≠6 mm and ≠7 mm openings: 84% of moderately plump seeds, 3% of seeds with reduced plumpness, and 13% of plump seeds.

scholarly journals Modeling size-density trajectories for even-aged beech (Fagus silvatica L.) stands in France

2016 ◽  
Vol 73 (3) ◽  
pp. 765-776 ◽  
Author(s):  
François Ningre ◽  
Jean-Marc Ottorini ◽  
Noël Le Goff
Keyword(s):  
Fagus Silvatica

�ber Phenolcarbons�uren der Rotbuche (Fagus silvatica L.)

1965 ◽  
Vol 52 (9) ◽  
pp. 208-208 ◽  
Author(s):  
Siegfried Beckmann ◽  
Dieter Volkmann
Keyword(s):  
Fagus Silvatica

scholarly journals Das Interglazial von Fahrenkrug in Holstein

1962 ◽  
Vol 13 (1) ◽  
pp. 5-14
Author(s):  
F.-R. Averdieck
Keyword(s):  
Fagus Silvatica

Abstract. Die Neuuntersuchung des Interglazialvorkommens von Fahrenkrug bei Segeberg (Holstein) ergab ein saale/weichselinterglaziales Alter (Zone e bis i). Die Angabe von Rotbuche, Fagus silvatica L., muß auf eine Fehlbestimmung zurückgeführt werden. Da bisher Rotbuchenfunde älteren Datums durch Nachuntersuchungen nicht bestätigt werden konnten, muß mit dem Fehlen von Fagus mindestens für das Jungpleistozän Nord- und Mitteleuropas gerechnet werden. Ausnahmen, die vermutlich in ein Würm-Interstadial zu stellen sind, sind aus dem Alpengebiet bekannt. Möglicherweise hängen hiermit fernverwehte Buchenpollen in einigen Fundplätzen des Brørup-Interstadials zusammen.

scholarly journals Differences in humic acids structure of various soil types studied by DRIFT spectroscopy

2018 ◽  
Vol 13 (No. 1) ◽  
pp. 29-35 ◽  
Author(s):  
L. Pavlů ◽  
M. Mühlhanselová
Keyword(s):  
Humic Acids ◽  
Agricultural Soils ◽  
Soil Types ◽  
Drift Spectroscopy ◽  
Aromatic Character ◽  
Diffuse Reflectance Infrared Spectroscopy ◽  
Freeze Dried ◽  
Fagus Silvatica ◽  
Diffuse Reflectance Infrared ◽  
Drift Spectra

The method of diffuse reflectance infrared spectroscopy (DRIFT) proved to be useful for studying the soil organic matter structure. The aim of this study was to compare DRIFT spectra of humic acids (HAs) separated from various soils and to identify their specific nature. Samples of agricultural soils (Dystric Cambisol, Haplic Chernozem, Greyic Phaeozem, and Haplic Luvisol) were collected from humic (A) horizons. Soil samples of reclaimed dumpsites (Haplic Technosol (molic) and (calcic)) were taken from the upper part of the soil profile. Samples of forest soils were collected from surface organic (H) horizons of Cambisols in spruce (Picea abies L. Karst.) and beech (Fagus silvatica L.) forests. The selected soil types differ in pH, carbon content, texture, and humus quality. An extraction of HAs was performed using a mixture of 0.5 M NaOH and 0.1 M Na<sub>4</sub>P<sub>2</sub>O<sub>7</sub>. The separated HAs were freeze-dried and analyzed using a DRIFT spectrometer (Thermo Nicolet Nexus) without KBr dilution. There were found differences in relative aromaticity among the agricultural soils HAs. The most aromatic character was observed in HAs from Chernozems and the least in Cambisols. Preservation of the natural structure of Chernozem HAs during the reclamation process was documented on the HAs spectra from Haplic Technosols (molic). By using the DRIFT spectra of HAs of forest H horizons, it is possible to identify the fragments of decomposed material (gymnosperms or angiosperms). HAs isolated from these horizons represent a certain interstage between lignin and the matured soil humic acids.

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