 |
| Titel |
Using intra annual density fluctuations and d13C to assess the impact of summer drought on Mediterranean ecosystem |
| VerfasserIn |
G. Battipaglia, W. A. Brand, P. Linke, I. Schaefer, M Noetzli, P. Cherubini |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024280
|
|
|
|
|
|
| Zusammenfassung |
| Tree- ring growth and wood density have been used extensively as indicators of climate change, and tree-ring has been commonly applied as a proxy estimate for seasonal integration of temperatures and precipitation with annual resolution (Hughes 2002). While these relationships have been well established in temperate ecosystems (Fritts, 1976; Schweingruber, 1988, Briffa et al., 1998, 2004), in Mediterranean region dendrochronological studies are still scarce (Cherubini et al, 2003).
In Mediterranean environment, trees may form intra-annual density fluctuations, also called “false rings” or “double rings” (Tingley 1937; Schulman 1938). They are usually induced by sudden drought events, occurring during the vegetative period, and, allowing intra-annual resolution, they may provide detailed information at a seasonal level, as well as species-specific sensitivity to drought.
We investigated the variability of tree- ring width and carbon stable isotopes of a Mediterranean species, Arbutus unedo L., sampled on Elba island, (Tuscany, Italy). The samples were taken at two different sites, one characterized by wet and one by dry conditions. d13C was measured using Laser- Ablation- Combustion -GC-IRMS.
Here, we present first results showing the impact of drought on tree growth and on false ring formation at the different sites and we underline the importance of using Laser Ablation to infer drought impact at the intra -annual level.
Briffa KR, Schweingruber FH, Jones PD, Osborn TJ, Harris IC, Shiyatov SG, Vaganov EA, Grudd H (1998) Trees tell of past climates: but are they speaking less clearly today? Phil Transact Royal Soc London 353:65–73
Briffa KR, Osborn TJ, Schweingruber FH (2004) Large-scale temperature inferences from tree rings: a review. Glob Panet Change 40:11–26
Cherubini, P., B.L. Gartner, R. Tognetti, O.U. Bräker, W. Schoch & J.L. Innes. 2003. Identification, measurement and interpretation of tree rings in woody species from Mediterranean climates. Biol. Rev. 78: 119–14
Fritts, H.C. 1976. Tree rings and climate. Academic Press, London, UK.
Hughes, M.K. 2002. Dendrochronology in climatology – the state of the art. Dendrochronologia 20: 95–116.
Schulman, E. 1938. Classification of false annual rings in Monterey pine. Tree-Ring Bull. 4:4-7
Schweingruber FH (1988) Tree-ring: Basics and applications of dendrochronology. Reidel. Publ., Dordrecht, 276 p
Tingley, M.A. 1937. Double growth rings in Red Astrachan. Proc. Am. Soc. Hort. Sci. 34: 61. |
|
|
|
|
|
|