Sessile oak (Quercus petraea Liebl.) site index variations in relation to climate, topography and soil in even-aged high-forest stands in northern France

Abstract

-The relationships between Q. petraea site index and site variables were studied using data from 99 even-aged high-forest stands located in north-western and north-eastern France. Stepwise multiple regressions using climate, topography and soil factors were adjusted and explain 49 to 60% of the variance in site index. This clearly demonstrates that an autecological study can be successfully performed over a large geographical area if an appropriate sampling strategy is applied. Moreover, the autecology of sessile oak was specified: (1) the role of soil water capacity, topographic position, log(Mg), log(S), K/P 2 O 5 , Mg/K and humus form was emphasized; (2) no regional differences in site index were observed, which was corroborated by few climatic effects; (3) models adjusted to each region were consistent; (4) nutrient factors explained a higher portion of variance of Q. petraea site index compared to climate/water-related factors, however the confounding effect was significant. site index / ecological factors / soil analyses / Quercus petraea (Mattus) Liebl. Résumé -Variations de l'indice de fertilité du chêne sessile (Quercus petraea Liebl.) en fonction du climat, de la topographie et du sol dans des futaies régulières adultes du nord de la France. Les relations entre l'indice de fertilité de Q. petraea et le milieu ont été étudiées dans 99 peuplements de futaies régulières adultes du centre-ouest et nord-est de la France. Des régressions multiples pas à pas basées sur le climat, la topographie et le sol expliquent de 49 à 60 % de la variance de l'indice de fertilité. Ce résultat indique clairement qu'une étude autécologique peut être menée avec succès sur un grand secteur géographique si une stratégie d'échantillonnage adaptée est appliquée. De plus, l'autécologie du chêne sessile est précisée : (1) nous soulignons le rôle de la réserve utile en eau du sol, de la position topographique, de log(Mg), log(S), K/P 2 O 5 , Mg/K et du type d'humus sur l'indice de fertilité ; (2) aucune différence inter-régionale n'est observée sur l'indice de fertilité, ce qui est corroboré par le faible effet du climat sur la croissance ; (3) les modèles prédictifs ajustés au niveau de chaque région sont très proches ; (4) la part de variance de l'indice de fertilité expliquée par le niveau trophique est plus élevée que celle liée aux facteurs hydriques et climatiques, mais la part commune expliquée par ces trois facteurs est importante.indice de fertilité / facteurs écologiques / analyses de sol / Quercus petraea (Mattus) Liebl.

Variation des composés volatils du bois dans un peuplement mixte de chênes: forte différenciation interspécifique et forte structuration spatiale de la quantité de whisky-lactone

“…Several research groups have investigated the botanical species (Quercus robur L. and Quercus petraea Liebl.) in relation to climate, topography, soil and dendrology [4,13,20,32,33]. These species are known to differ in the concentration of some volatile substances, especially the β-methyl-γ-octolactone (whisky-lactone), which was consistently found to be more abundant in Q. petraea than in Q. robur [8,14,18,[26][27][28].…”

An index for the assessment of degraded Mediterranean forest ecosystems

“…The Stems density (St) ranges from 428 to 224 ha -1 in SA, with the minimum value higher than the ones found by Portoghesi et al (2005) for Turkey oak woodlands (Q. cerris L.) of central Italy. In SB, St ranges from 352 to 124 ha -1 , far below the values found for other cork oak woodlands (Aronson et al, 2009;Barreca et al, 2010;Rives et al, 2012).There is a marked decrease in G ha -1 (from 21.6 to 7.6 m 2 ) in SA with values below the minimum level of 13.1 m 2 found for the same species in France (Bergès et al, 2005;Bergès & Balandier 2009 (Agrimi et al, 1991) and 396 m 3 (Portoghesi et al, 2005) founded for other oaks woodland in Italy.…”

C-glucosidic ellagitannin concentrations variability during the years in Syrah wines from Languedoc vineyard

“…These evolution compounds may have an important content in th World Congress of Vine and Wine red wine as well as an impact on its sensory perception. Moreover, the heterogeneity of wood is an important variable that can gives unlikeable responses, as there are a lot of factors that are going to be implicit in the oak wood election [7,9,[25][26][27][28][29].…”

“…Several factors can influence the ellagitannins content in oak wood [9], such as the oak species (Quercus robur and Quercus petraea), the geographical origin [25,26], the age [27], the topography [7,28] and the geographic location of the wood piece in the trees [27,29], as well as the processing of wood in cooperage (i.e., type and duration of drying and toasting) [30,31]. Moreover, the age of the barrels is also important [32].…”