Annals of Forest Science

https://www.afs-journal.org/

List of Papers (Total 2,088)

How do trees affect spatio-temporal heterogeneity of nutrient cycling in mediterranean annual grasslands?

• In this study we analyzed heterogeneity in nutrient cycling induced by trees in Mediterranean annual grasslands, comparing years of higher and lower than average precipitation and analyzing the effects of two different solar radiation scenarios. • Organic matter and consequently upper soil N, K, Ca and Mg were significantly greater in those locations receiving the highest...

Diminished vessel diameter as a possible factor in the decline of European ash (Fraxinus excelsior L.)

• The aim of this work was to examine the anatomy and functioning of secondary xylem in stems in relation to the decline of European ash (Fraxinus excelsior L.).• We tested the hypothesis that declining trees show changes in the structure of wood, which result in impaired water transport.• Anatomical analyses were carried out on wood samples (comprising all annual rings formed...

Foliar resorption in Quercus petraea subsp. iberica and Arbutus andrachne along an elevational gradient

• The resorption of nutrients (mainly N and P) from senescing leaves may be a key component of adaptive mechanisms that conserve scarce nutrients. Resorption may be expressed in two ways as resorption efficiency (RE) which is the ratio of the resorbed amounts of nutrient losses during leaf senescence in relation to its prior amount deposited in leaves and resorption proficiency...

DNA methylation and histone acetylation: genotypic variations in hybrid poplars, impact of water deficit and relationships with productivity

• Several reports on annual plants have already shown the involvement of epigenetic modifiers such as DNA methylation in their adaptation to abiotic stresses.• Nevertheless, the genotypic variations of epigenetic modifiers, their possible correlations with morphological traits and the impact of water deficit have not been described for perennial plants.• Six genotypes of Populus...

Photosynthetic temperature adaptation of Pinus cembra within the timberline ecotone of the Central Austrian Alps

• Temperature is suggested to determine the upper limit of tree life. Therefore, future climate warming may be of importance for tree distribution within the European Alps, where low temperatures limit carbon metabolism.• We focused on the effects of air and soil temperature on net photosynthesis (Pn) of Pinus cembra an evergreen climax species of the timberline ecotone of the...

Optimizing the debarking and cutting schedule of cork oak stands

Key message Optimal management of cork oak forest stands was analyzed for different site indices and cork growth rates. Optimal debarking intervals varied during the rotation and were sometimes shorter or longer than the officially recommended range of 9–14 years. ContextQuercus suber L. is one of the most important multipurpose tree species in the Mediterranean area. Its main...

How does economic research contribute to the management of forest ecosystem services?

Key message More and more environmental and resource economists are taking a particular interest in research on forest ecosystem services (FES), especially in a context of climate change. Spatial and temporal issues are crucial to economic analyses and for the design of conservation policies. Interdisciplinary research involving ecological and economic disciplines is a...

Responses of the structure and function of the understory plant communities to precipitation reduction across forest ecosystems in Germany

Key message Understory plant communities are essential for the recruitment of trees making up future forests. Independent of plant diversity, the understory across different forest ecosystems shows considerable physiological acclimation and structural stability towards drought events, which are expected to occur more frequently in future. Context Understory plant communities are...

Unraveling the tripartite interactions among the woolly poplar aphid, its host tree, and their environment: a lead to improve the management of a major tree plantation pest?

Key message For an optimal deployment of poplar resistance to the gall-inducing aphid Phloeomyzus passerinii , a laboratory susceptibility assay has been developed. The nature of aphid–tree interactions during compatible and incompatible situations has been studied in detail. This should help at identifying specific resistance markers and at testing effects of site conditions on...

Short-day photoperiods affect expression of genes related to dormancy and freezing tolerance in Norway spruce seedlings

Key Message Gene expression analysis showed that prolonged short day (SD) treatment deepened dormancy and stimulated development of freezing tolerance of Picea abies seedlings. Prolonged SD treatment also caused later appearance of visible buds in autumn, reduced risks for reflushing, and promoted earlier spring bud break. Context Short day (SD) treatment of seedlings is a common...

Xylem traits in European beech (Fagus sylvatica L.) display a large plasticity in response to canopy release

Key messageThe position of trees in the canopy impacts xylem structure and its inter-annual variation. After canopy release, the increase in the hydraulic conductivity of growth rings was driven by an increase in radial growth in large trees, and by both an increase in radial growth and changes in xylem structure in saplings.ContextForest canopies are frequently subjected to...

A non-stochastic portfolio model for optimizing the transformation of an even-aged forest stand to continuous cover forestry when information about return fluctuation is incomplete

Key message Non-stochastic portfolio optimization of forest stands provides a good alternative to stochastic mean-variance optimization when available statistical data is incomplete. The suggested approach has a theoretical background in the areas of robust optimization, continuous multicriteria decision-making, and fuzzy theory. Resulting robust portfolios only show slight...

Growth phenology in Pinus halepensis Mill.: apical shoot bud content and shoot elongation

Key message The chronology of periods of organogenesis and elongation is highlighted in Pinus halepensis.The two first growth units of an annual shoot are preformed inside the bud during the previous year. The following growth units are formed during the spring or summer of the current year.ContextAnalysis of annual shoot length growth phenology is crucial to assess the impact of...

Optimal sap flux sensor allocation for stand transpiration estimates: a non-dimensional analysis

Key messageMeasuring between-tree variations in sap flux density rather than azimuthal variations should be prioritized for reliable stand transpiration estimates based on sap flux methods.ContextStand transpiration (E) estimated using sap flux methods includes uncertainty induced by azimuthal variations and between-tree variations in sap flux density (F).AimsThis study examines...

Allometry varies among related families of Norway spruce

Key message Slopes and intercepts of allometric equations for organs’ biomass varied among half-sib families of Norway spruce and between age categories in a family-dependent manner. Genetic variation should be accounted for when applying allometric analysis to mixtures of genetic groups. Context Genetic variation in relationships among plant biomass components was rarely...

Forest modelling: the gamma shape mixture model and simulation of tree diameter distributions

• Key message New types of distribution functions are needed to model the dynamics of stands where important age classes are represented by few trees. In this study the gamma shape mixture model and two simulation methods were used for generating tree diameter data. • Context To analyse forest dynamics, it is necessary to know distribution of the characteristics (mainly tree...