The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Bjorn Hoppe - One of the best experts on this subject based on the ideXlab platform.
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Erratum: A pyrosequencing insight into sprawling bacterial diversity and community dynamics in decaying deadwood logs of Fagus Sylvatica and Picea abies
Scientific Reports, 2016Co-Authors: Bjorn Hoppe, Dirk Kruger, Tiemo Kahl, Tobias Arnstadt, Francois Buscot, Jurgen Bauhus, Tesfaye WubetAbstract:Deadwood is an important biodiversity hotspot in forest ecosystems. While saproxylic insects and wood-inhabiting fungi have been studied extensively, little is known about deadwood-inhabiting bacteria. The study we present is among the first to compare bacterial diversity and community structure of deadwood under field conditions. We therefore compared deadwood logs of two temperate forest tree species Fagus Sylvatica and Picea abies using 16S rDNA pyrosequencing to identify changes in bacterial diversity and community structure at different stages of decay in forest plots under different management regimes. Alphaproteobacteria, Acidobacteria and Actinobacteria were the dominant taxonomic groups in both tree species. There were no differences in bacterial OTU richness between deadwood of Fagus Sylvatica and Picea abies . Bacteria from the order Rhizobiales became more abundant during the intermediate and advanced stages of decay, accounting for up to 25% of the entire bacterial community in such logs. The most dominant OTU was taxonomically assigned to the genus Methylovirgula , which was recently described in an experiment of Fagus Sylvatica woodblocks. Besides tree species we were able to demonstrate that deadwood physico-chemical properties, in particular remaining mass, relative wood moisture, pH, and C/N ratio serve as drivers of community composition of deadwood-inhabiting bacteria.
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a pyrosequencing insight into sprawling bacterial diversity and community dynamics in decaying deadwood logs of Fagus Sylvatica and picea abies
Scientific Reports, 2015Co-Authors: Bjorn Hoppe, Dirk Kruger, Tiemo Kahl, Tobias Arnstadt, Francois Buscot, Jurgen Bauhus, Tesfaye WubetAbstract:Deadwood is an important biodiversity hotspot in forest ecosystems. While saproxylic insects and wood-inhabiting fungi have been studied extensively, little is known about deadwood-inhabiting bacteria. The study we present is among the first to compare bacterial diversity and community structure of deadwood under field conditions. We therefore compared deadwood logs of two temperate forest tree species Fagus Sylvatica and Picea abies using 16S rDNA pyrosequencing to identify changes in bacterial diversity and community structure at different stages of decay in forest plots under different management regimes. Alphaproteobacteria, Acidobacteria and Actinobacteria were the dominant taxonomic groups in both tree species. There were no differences in bacterial OTU richness between deadwood of Fagus Sylvatica and Picea abies. Bacteria from the order Rhizobiales became more abundant during the intermediate and advanced stages of decay, accounting for up to 25% of the entire bacterial community in such logs. The most dominant OTU was taxonomically assigned to the genus Methylovirgula, which was recently described in a woodblock experiment of Fagus Sylvatica. Besides tree species we were able to demonstrate that deadwood physico-chemical properties, in particular remaining mass, relative wood moisture, pH, and C/N ratio serve as drivers of community composition of deadwood-inhabiting bacteria.
Tesfaye Wubet - One of the best experts on this subject based on the ideXlab platform.
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Erratum: A pyrosequencing insight into sprawling bacterial diversity and community dynamics in decaying deadwood logs of Fagus Sylvatica and Picea abies
Scientific Reports, 2016Co-Authors: Bjorn Hoppe, Dirk Kruger, Tiemo Kahl, Tobias Arnstadt, Francois Buscot, Jurgen Bauhus, Tesfaye WubetAbstract:Deadwood is an important biodiversity hotspot in forest ecosystems. While saproxylic insects and wood-inhabiting fungi have been studied extensively, little is known about deadwood-inhabiting bacteria. The study we present is among the first to compare bacterial diversity and community structure of deadwood under field conditions. We therefore compared deadwood logs of two temperate forest tree species Fagus Sylvatica and Picea abies using 16S rDNA pyrosequencing to identify changes in bacterial diversity and community structure at different stages of decay in forest plots under different management regimes. Alphaproteobacteria, Acidobacteria and Actinobacteria were the dominant taxonomic groups in both tree species. There were no differences in bacterial OTU richness between deadwood of Fagus Sylvatica and Picea abies . Bacteria from the order Rhizobiales became more abundant during the intermediate and advanced stages of decay, accounting for up to 25% of the entire bacterial community in such logs. The most dominant OTU was taxonomically assigned to the genus Methylovirgula , which was recently described in an experiment of Fagus Sylvatica woodblocks. Besides tree species we were able to demonstrate that deadwood physico-chemical properties, in particular remaining mass, relative wood moisture, pH, and C/N ratio serve as drivers of community composition of deadwood-inhabiting bacteria.
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a pyrosequencing insight into sprawling bacterial diversity and community dynamics in decaying deadwood logs of Fagus Sylvatica and picea abies
Scientific Reports, 2015Co-Authors: Bjorn Hoppe, Dirk Kruger, Tiemo Kahl, Tobias Arnstadt, Francois Buscot, Jurgen Bauhus, Tesfaye WubetAbstract:Deadwood is an important biodiversity hotspot in forest ecosystems. While saproxylic insects and wood-inhabiting fungi have been studied extensively, little is known about deadwood-inhabiting bacteria. The study we present is among the first to compare bacterial diversity and community structure of deadwood under field conditions. We therefore compared deadwood logs of two temperate forest tree species Fagus Sylvatica and Picea abies using 16S rDNA pyrosequencing to identify changes in bacterial diversity and community structure at different stages of decay in forest plots under different management regimes. Alphaproteobacteria, Acidobacteria and Actinobacteria were the dominant taxonomic groups in both tree species. There were no differences in bacterial OTU richness between deadwood of Fagus Sylvatica and Picea abies. Bacteria from the order Rhizobiales became more abundant during the intermediate and advanced stages of decay, accounting for up to 25% of the entire bacterial community in such logs. The most dominant OTU was taxonomically assigned to the genus Methylovirgula, which was recently described in a woodblock experiment of Fagus Sylvatica. Besides tree species we were able to demonstrate that deadwood physico-chemical properties, in particular remaining mass, relative wood moisture, pH, and C/N ratio serve as drivers of community composition of deadwood-inhabiting bacteria.
André Granier - One of the best experts on this subject based on the ideXlab platform.
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Beech (Fagus Sylvatica L.) branches show acclimation of xylem anatomy and hydraulic properties to increased light after thinning
Annals of Forest Science, 2002Co-Authors: Damien Lemoine, Sophie Jacquemin, André GranierAbstract:Hydraulic acclimation of Fagus Sylvatica L. was analysed in response to forest thinning. Several months after thinning, leaf and xylem water potential and stomatal conductance of thinned branches were compared to sun-exposed and shade branches. We characterised vulnerability to cavitation for branches taken from these three treatments. We compared effect of thinning on xylem anatomy (mean vessel diameter, vessel density). Thinned branches exhibited higher stomatal conductance and lower leaf water potential. These results were well correlated with vulnerability to cavitation. Thinned branches were less vulnerable than shade branches and mean vessel diameter and vessel density increased in thinned branches. These differences showed a partial hydraulic acclimation to climate changes. We confirmed that vulnerability to cavitation and xylem anatomy in Fagus Sylvatica acclimate to changing light conditions, and we concluded that hydraulic architecture acclimates sufficiently fast after environmental changes to protect xylem from dysfunction while maintaining open stomata.
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Mechanisms of xylem recovery from winter embolism in Fagus Sylvatica.
Tree physiology, 2001Co-Authors: Hervé Cochard, Damien Lemoine, Thierry Améglio, André GranierAbstract:Hydraulic conductivity in the terminal branches of mature beech trees (Fagus Sylvatica L.) decreased progressively during winter and recovered in the spring. The objective of this study was to determine the mechanisms involved in recovery. Two periods of recovery were identified. The first recovery of hydraulic conductivity occurred early in the spring, before bud break, and was correlated with the occurrence of positive xylem pressure at the base of the tree trunk. Active refilling of the embolized vessels caused the recovery. The second recovery of hydraulic conductivity occurred after bud break and was correlated with the onset of cambial activity. Formation of new functional vessels, leading to an increase in xylem diameter, was largely responsible for the increase in xylem conductivity. The two mechanisms were complementary: active refilling of embolized vessels occurred mostly in the root and the trunk, whereas formation of new functional vessels occurred mainly in young terminal shoots.
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Carbon balance and tree growth in a Fagus Sylvatica stand
Annals of Forest Science, 2000Co-Authors: Stéphanie Lebaube, Noël Le Goff, Jean Marc Ottorini, André GranierAbstract:The objectives of this study were 1) to scale photosynthesis from leaf to crown and to tree scale, 2) to determine the proportion of assimilated carbon used for wood construction and whether the fraction of assimilation used for production varies among social classes and 3) to validate the approach by comparing assimilation estimates with independent measurements provided by the eddy covariance technique (EC). Measurements (growth and gas exchange) were performed in a 30-year-old Fagus Sylvatica stand during the 1997 growing season on five sample trees of different crown classes (dominant, codominant and intermediate trees). A nonlinear relationship between net CO2 assimilation and photosynthetically active radiation (PAR) was found for each sample trees. Canopy net CO2 assimilation was then modelled over a period of non limiting soil water soil water content. Simulated gross assimilation scaled to stand level was in good agreement with stand measurements performed by EC.
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Mechanism of freeze-induced embolism in Fagus Sylvatica L.
Trees, 1999Co-Authors: Damien Lemoine, André Granier, Hervé CochardAbstract:The mechanism of freeze stress-induced embolism in Fagus Sylvatica L. branches was analyzed under controlled conditions. Excised branches were exposed to successive freeze-thaw cycles in temperature controlled chambers. Thermocouples were placed on the bark to detect sap freezing exotherms. The degree of xylem embolism was estimated after each cycle by the loss of hydraulic conductivity. After one freeze-thaw cycle the degree of embolism was found to decrease with xylem specific hydraulic conductivity, small apical shoots being more susceptible to embolism. Exotherms revealed that distal shoots were freezing first and exuded sap as a result of water expansion. The lower water content in apical shoots upon freezing probably induced higher sap tensions which promoted air bubble expansion and vessel cavitation preferentially near the apices. When the decrease in water content was experimentally prevented, embolism developed to a lesser extent. The higher vulnerability of shoot apices may protect the rest of the branch from winter damage.
Tiemo Kahl - One of the best experts on this subject based on the ideXlab platform.
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Erratum: A pyrosequencing insight into sprawling bacterial diversity and community dynamics in decaying deadwood logs of Fagus Sylvatica and Picea abies
Scientific Reports, 2016Co-Authors: Bjorn Hoppe, Dirk Kruger, Tiemo Kahl, Tobias Arnstadt, Francois Buscot, Jurgen Bauhus, Tesfaye WubetAbstract:Deadwood is an important biodiversity hotspot in forest ecosystems. While saproxylic insects and wood-inhabiting fungi have been studied extensively, little is known about deadwood-inhabiting bacteria. The study we present is among the first to compare bacterial diversity and community structure of deadwood under field conditions. We therefore compared deadwood logs of two temperate forest tree species Fagus Sylvatica and Picea abies using 16S rDNA pyrosequencing to identify changes in bacterial diversity and community structure at different stages of decay in forest plots under different management regimes. Alphaproteobacteria, Acidobacteria and Actinobacteria were the dominant taxonomic groups in both tree species. There were no differences in bacterial OTU richness between deadwood of Fagus Sylvatica and Picea abies . Bacteria from the order Rhizobiales became more abundant during the intermediate and advanced stages of decay, accounting for up to 25% of the entire bacterial community in such logs. The most dominant OTU was taxonomically assigned to the genus Methylovirgula , which was recently described in an experiment of Fagus Sylvatica woodblocks. Besides tree species we were able to demonstrate that deadwood physico-chemical properties, in particular remaining mass, relative wood moisture, pH, and C/N ratio serve as drivers of community composition of deadwood-inhabiting bacteria.
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a pyrosequencing insight into sprawling bacterial diversity and community dynamics in decaying deadwood logs of Fagus Sylvatica and picea abies
Scientific Reports, 2015Co-Authors: Bjorn Hoppe, Dirk Kruger, Tiemo Kahl, Tobias Arnstadt, Francois Buscot, Jurgen Bauhus, Tesfaye WubetAbstract:Deadwood is an important biodiversity hotspot in forest ecosystems. While saproxylic insects and wood-inhabiting fungi have been studied extensively, little is known about deadwood-inhabiting bacteria. The study we present is among the first to compare bacterial diversity and community structure of deadwood under field conditions. We therefore compared deadwood logs of two temperate forest tree species Fagus Sylvatica and Picea abies using 16S rDNA pyrosequencing to identify changes in bacterial diversity and community structure at different stages of decay in forest plots under different management regimes. Alphaproteobacteria, Acidobacteria and Actinobacteria were the dominant taxonomic groups in both tree species. There were no differences in bacterial OTU richness between deadwood of Fagus Sylvatica and Picea abies. Bacteria from the order Rhizobiales became more abundant during the intermediate and advanced stages of decay, accounting for up to 25% of the entire bacterial community in such logs. The most dominant OTU was taxonomically assigned to the genus Methylovirgula, which was recently described in a woodblock experiment of Fagus Sylvatica. Besides tree species we were able to demonstrate that deadwood physico-chemical properties, in particular remaining mass, relative wood moisture, pH, and C/N ratio serve as drivers of community composition of deadwood-inhabiting bacteria.
Dirk Kruger - One of the best experts on this subject based on the ideXlab platform.
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Erratum: A pyrosequencing insight into sprawling bacterial diversity and community dynamics in decaying deadwood logs of Fagus Sylvatica and Picea abies
Scientific Reports, 2016Co-Authors: Bjorn Hoppe, Dirk Kruger, Tiemo Kahl, Tobias Arnstadt, Francois Buscot, Jurgen Bauhus, Tesfaye WubetAbstract:Deadwood is an important biodiversity hotspot in forest ecosystems. While saproxylic insects and wood-inhabiting fungi have been studied extensively, little is known about deadwood-inhabiting bacteria. The study we present is among the first to compare bacterial diversity and community structure of deadwood under field conditions. We therefore compared deadwood logs of two temperate forest tree species Fagus Sylvatica and Picea abies using 16S rDNA pyrosequencing to identify changes in bacterial diversity and community structure at different stages of decay in forest plots under different management regimes. Alphaproteobacteria, Acidobacteria and Actinobacteria were the dominant taxonomic groups in both tree species. There were no differences in bacterial OTU richness between deadwood of Fagus Sylvatica and Picea abies . Bacteria from the order Rhizobiales became more abundant during the intermediate and advanced stages of decay, accounting for up to 25% of the entire bacterial community in such logs. The most dominant OTU was taxonomically assigned to the genus Methylovirgula , which was recently described in an experiment of Fagus Sylvatica woodblocks. Besides tree species we were able to demonstrate that deadwood physico-chemical properties, in particular remaining mass, relative wood moisture, pH, and C/N ratio serve as drivers of community composition of deadwood-inhabiting bacteria.
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a pyrosequencing insight into sprawling bacterial diversity and community dynamics in decaying deadwood logs of Fagus Sylvatica and picea abies
Scientific Reports, 2015Co-Authors: Bjorn Hoppe, Dirk Kruger, Tiemo Kahl, Tobias Arnstadt, Francois Buscot, Jurgen Bauhus, Tesfaye WubetAbstract:Deadwood is an important biodiversity hotspot in forest ecosystems. While saproxylic insects and wood-inhabiting fungi have been studied extensively, little is known about deadwood-inhabiting bacteria. The study we present is among the first to compare bacterial diversity and community structure of deadwood under field conditions. We therefore compared deadwood logs of two temperate forest tree species Fagus Sylvatica and Picea abies using 16S rDNA pyrosequencing to identify changes in bacterial diversity and community structure at different stages of decay in forest plots under different management regimes. Alphaproteobacteria, Acidobacteria and Actinobacteria were the dominant taxonomic groups in both tree species. There were no differences in bacterial OTU richness between deadwood of Fagus Sylvatica and Picea abies. Bacteria from the order Rhizobiales became more abundant during the intermediate and advanced stages of decay, accounting for up to 25% of the entire bacterial community in such logs. The most dominant OTU was taxonomically assigned to the genus Methylovirgula, which was recently described in a woodblock experiment of Fagus Sylvatica. Besides tree species we were able to demonstrate that deadwood physico-chemical properties, in particular remaining mass, relative wood moisture, pH, and C/N ratio serve as drivers of community composition of deadwood-inhabiting bacteria.
