Stable oxygen isotope signatures of early season wood in New Zealand kauri ( Agathis australis) tree rings: Prospects for palaeoclimate reconstruction
| Autor: | Greg Eischeid, Cate Macinnis-Ng, Tom H. Brookman, A. S. Criscitiello, Daniel P. Schrag, Nicolas Fauchereau, Travis W. Horton, Margaret M. Barbour, Andrew Lorrey, Anthony M. Fowler, Michael N. Evans |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Stomatal conductance 010504 meteorology & atmospheric sciences Ecology biology Range (biology) Plant Science Dendroclimatology biology.organism_classification Atmospheric sciences 01 natural sciences Huia Climatology Dendrochronology Environmental science Southern Hemisphere Agathis australis 010606 plant biology & botany 0105 earth and related environmental sciences Transpiration |
| Zdroj: | Dendrochronologia. 40:50-63 |
| ISSN: | 1125-7865 |
| DOI: | 10.1016/j.dendro.2016.03.012 |
| Popis: | One of the longest Southern Hemisphere tree ring chronologies that has potential to provide past climate reconstructions has been produced using New Zealand kauri ( Agathis australis ). Work to date on kauri has been limited to reconstructions from whole-ring width analysis. In this study, we present the first replicated stable oxygen isotopic composition of early season alpha-cellulose from calendar-dated kauri tree rings within the natural growth range of the species. We also use newly established kauri physiology information about stomatal conductance and a mechanistic model to place initial interpretations on kauri δ 18 O signatures. Kauri early season δ 18 O has a range from 26 to 34‰ (V-SMOW) for a site located at Lower Huia Dam in west Auckland, and the mean δ 18 O chronology from that site is significantly correlated (p 18 O simulations using the forward model of Barbour et al. (2004) that incorporates a leaf temperature energy balance model to calculate transpiration as forced with local meteorological variables and a range of physiological parameters. The correlation results and mechanistic model simulations suggest kauri δ 18 O early season wood has the potential to provide new quantitative past climate information for northern New Zealand, and also complement whole ring-width reconstructions of past regional climate variability – a component of which is previously established as sensitive to El Nino-Southern Oscillation activity. Additional work is required to determine whether the observed relationships are consistent across the growth range of kauri and what the optimum sample depth is before long isotope-based palaeoclimate reconstructions from modern and sub-fossil kauri sites are undertaken. |
| Databáze: | OpenAIRE |
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