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

Autor: Barçante Ladvocat Cintra, Bruno, Gloor, Manuel, Boom, Arnoud, Schöngart, Jochen, Locosselli, Giuliano Maselli, Brienen, Roel
Rok vydání: 2019
Předmět:
0106 biological sciences
0301 basic medicine
Cedrela Odorata
Physiology
Carbon-13
Plant Science
Oxygen Isotopes
Forests
01 natural sciences
Tropic Climate
Isotopes of oxygen
Tree Ring
Trees
tropical forests
Carbon Isotopes
geography.geographical_feature_category
oxygen isotopes
Amazon rainforest
Ecology
Chemistry
Seasons
Tree
Brazil
Research Paper
Stomatal conductance
Floodplain
δ18O
dual isotope
Carbon Isotope
Models
Biological
03 medical and health sciences
Biological Model
Amazonia
Macrolobium acaciifolium
medicine
Dendrochronology
Tropical Forest
Oxygen Isotope
Forest
Plant Leaf
Precipitation
Oxygen-18
Tropical Climate
geography
Macrolobium Acaciifolium
Brasil
Seasonality
Seasonal Variation
15. Life on land
Cedrela odorata
medicine.disease
Carbon
Oxygen
Plant Leaves
030104 developmental biology
13. Climate action
Environmental science
Deciduous Tree
Season
Hydrology
010606 plant biology & botany
Zdroj: Tree Physiology
Repositório Institucional do INPA
Instituto Nacional de Pesquisas da Amazônia (INPA)
instacron:INPA
ISSN: 1758-4469
0829-318X
DOI: 10.1093/treephys/tpz009
Popis: 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. © The Author(s) 2019.
Databáze: OpenAIRE
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