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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Contrasting controls on tree ring isotope variation for Amazon floodplain and terra firme trees

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Ladvocat Cintra, Bruno Barcante [1] ; Gloor, Manuel [1] ; Boom, Arnoud [2] ; Schongart, Jochen [3] ; Locosselli, Giuliano Maselli [4] ; Brienen, Roel [1]
Total Authors: 6
[1] Univ Leeds, Sch Geog, Leeds LS2 9JT, Garstang North - England
[2] Univ Leicester, Sch Geol Geog & Environm, Bennett Bldg, Univ Rd, Leicester LE1 7RH, Leics - England
[3] Natl Inst Amazon Res, Av Andre Araujo 2-936, BR-69067375 Manaus, Amazonas - Brazil
[4] Univ Sao Paulo, Ins Biosci, Rua Matao 14, BR-05508090 Butanta, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: TREE PHYSIOLOGY; v. 39, n. 5, p. 845-860, MAY 2019.
Web of Science Citations: 0

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 (delta O-18(TR) and delta C-13(TR)) 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 intraannual patterns of delta O-18(TR) and delta C-13(TR) driven mostly by seasonal variation in weather and source water delta O-18. 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 delta C-13(TR). Climate analysis reveal that terra firme delta O-18(TR) signals were related to basin-wide precipitation, indicating a source water delta O-18 influence, while floodplain trees recorded leaf enrichment effects related to local climate. Thus, intrinsically different processes (source water vs leaf enrichment) affect delta O-18(TR) 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 delta C-13(TR) and delta O-18(TR) 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. (AU)

FAPESP's process: 15/25511-3 - Climate and pollution reconstruction based on urban tree-rings growth records
Grantee:Giuliano Maselli Locosselli
Support type: Scholarships in Brazil - Post-Doctorate