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A Dual Stable Isotope Approach Unravels Common Climate Signals and Species-Specific Responses to Environmental Change Stored in Multi-Century Tree-Ring Series from the Tibetan Plateau.
- Source :
- Geosciences (2076-3263); Apr2019, Vol. 9 Issue 4, p151, 1p
- Publication Year :
- 2019
-
Abstract
- Tree-rings are recorders of environmental signals and are therefore often used to reconstruct past environmental conditions. In this paper, we present four annually resolved, multi-centennial tree-ring isotope series from the southeastern Tibetan plateau. The investigation site, where juniper and spruce trees jointly occur, is one of the highest known tree-stands in the world. Tree ring cellulose oxygen (δ<superscript>18</superscript>O) and carbon (δ<superscript>13</superscript>C) isotopes were analyzed for a common period of 1685–2007 AD to investigate climate–isotope relationships. Therefore, various climate parameters from a local meteorological station and from the CRU 4.02 dataset were used. Tree-ring δ<superscript>18</superscript>O of both species revealed highly significant sensitivities with a high degree of coherence to hydroclimate variables during the growing season. The obtained δ<superscript>18</superscript>O–climate relationships can even be retained using a species mean. In contrast, the individual δ<superscript>13</superscript>C series indicated a weaker and non-uniform response to the tested variables. Underlying species-specific responses and adaptations to the long-term trend in atmospheric CO<subscript>2</subscript> bias even after a trend correction identified dominant environmental factors triggering the tree-ring δ<superscript>13</superscript>C at our site. However, analysis of individual intrinsic water-use efficiency in juniper and spruce trees indicated a species-specific adaptation strategy to climate change. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20763263
- Volume :
- 9
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Geosciences (2076-3263)
- Publication Type :
- Academic Journal
- Accession number :
- 136237629
- Full Text :
- https://doi.org/10.3390/geosciences9040151