Ladvocat Cintra, BB, Gloor, M orcid.org/0000-0002-9384-6341, Boom, A et al. (3 more authors) (2019) Contrasting controls on tree ring isotope variation for Amazon floodplain and terra firme trees. Tree Physiology, 39 (5). tpz009. pp. 845-860. ISSN 0829-318X
Abstract
Isotopes in tropical trees rings can improve our understanding of tree responses to climate. We assessed how climate and growing conditions affect tree-ring oxygen and carbon isotopes (δ18OTR and δ13CTR) in four Amazon trees. We analysed within-ring isotope variation for two terra firme (non-flooded) and two floodplain trees growing at sites with varying seasonality. We find distinct intra-annual patterns of δ18OTR and δ13CTR driven mostly by seasonal variation in weather and source water δ18O. Seasonal variation in isotopes was lowest for the tree growing under the wettest conditions. Tree ring cellulose isotope models based on existing theory reproduced well observed within-ring variation with possible contributions of both stomatal and mesophyll conductance to variation in δ13CTR. Climate analysis reveal that terra firme δ18OTR signals were related to basin-wide precipitation, indicating a source water δ18O influence, while floodplain trees recorded leaf enrichment effects related to local climate. Thus, intrinsically different processes (source water vs leaf enrichment) affect δ18OTR in the two different species analysed. These differences are likely a result of both species-specific traits and of the contrasting growing conditions in the floodplains and terra firme environments. Simultaneous analysis of δ13CTR and δ18OTR supports this interpretation as it shows strongly similar intra-annual patterns for both isotopes in the floodplain trees arising from a common control by leaf stomatal conductance, while terra firme trees showed less covariation between the two isotopes. Our results are interesting from a plant physiological perspective and have implications for climate reconstructions as trees record intrinsically different processes.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © The Author(s) 2019. Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
Keywords: | carbon isotopes; Cedrela odorata; dual isotope; Macrolobium acaciifolium; oxygen isotopes; tropical forests |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) > Ecology & Global Change (Leeds) |
Funding Information: | Funder Grant number NERC NE/K01353X/1 RCUK NE/M02203X/1 RCUK NE/M022021/1 NERC NE/S008659/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Feb 2019 14:51 |
Last Modified: | 12 Jul 2019 13:58 |
Status: | Published |
Publisher: | Oxford University Press |
Identification Number: | 10.1093/treephys/tpz009 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:142781 |