Integrating inter- and intra-annual tree-ring width, carbon isotopes and anatomy : responses to climate variability in a temperate oak forest.

0 avis

Integrating inter- and intra-annual tree-ring width, carbon isotopes and anatomy : responses to climate variability in a temperate oak forest.

Archive ouverte

Edité par CCSD -

International audience. While many forests are experiencing strong tree declines due to climate change in temperate ecosystems, others nearby to those declining show no apparent signs of decline. This could be due to particular microsite conditions or, for instance, to a higher plasticity of given traits that allow a better performance under stressful conditions. We studied oak functional mechanisms (Quercus petraea) leading to the apparently healthy status of the forest and their relation to the observed climatic variability. This study was conducted in the Barbeau Forest (northern France), where cores from mature trees were collected. Three types of functional traits (secondary growth, physiological variables - δ13C and derived ∆13C and iWUE- and several anatomical ones -e.g. vessel area, density-) were recorded for each ring for the 1991-2011 period, distinguishing EW from LW in all measured traits. Among the three types of functional traits, those related to growth experienced the highest variability both between years and between individuals, followed by anatomical and physiological ones. Secondary growth maintained a constant trend during the study period. Instead, ring, EW and LW δ13C slightly declined from 1991 to 2011. Additional intra-ring δ13C analyses allowed for a more detailed understanding of the seasonal dynamics within each year. In particular, the year 2007 (an especially favorable climatic year during the growing season) showed the lowest δ13C values during the EW-LW transition for the whole study period. Inter-annual anatomical traits varied in their responses, but in general, no temporal trends were found. The results from structural equation modeling (SEM) showed direct relationships of seasonal climate and growth, as well as indirect relationships mediated by anatomical and physiological traits. We further discuss the implications of these results on future forest responses to ongoing climate changes.

Langue: en

Indexation

Consulter en ligne

Consulter le document

Suggestions

Du même auteur

Intra-annual tree ring ð13C across time: tracking the responses of Q. petraea to climatic variation

Archive ouverte | Granda, Elena | CCSD

International audience

Seasonal physiological interpretation of intra-ring δ13C variation in temperate species: experimental and modelling approach

Archive ouverte | Damesin, Claire | CCSD

International audience. Ring δ13C is a physiological and climatic archive that offers resolution at the annual and seasonal time scales. In this contribution, we synthesize our results relative to the functional und...

Evidence of a seasonal trade-off between growth and starch storage in declining beeches. Evidence of a seasonal trade-off between growth and starch storage in declining beeches: Assessment through stem radial increment, non-structural carbohydrates and intra-ring δ13C

Archive ouverte | Michelot-Antalik, Alice | CCSD

Forest decline is reported in recent decades all over the world. However, developing a clear vision of the associated tree dysfunctioning is still a challenge for plant physiologists. In this study, our aim was to examine the seas...

Chargement des enrichissements...