Impacts of leaf age on the spectral and physiochemical traits of trees in Amazonian forest canopies

Chavana-Bryant, C

Abstract:: This doctoral research presents the first comprehensive analysis of the morphological, biochemical and spectral leaf traits of canopy and emergent tropical trees during natural (in situ) leaf ageing. It adopts an interdisciplinary approach and combines multiple scales of analysis to generate insights into the effects of natural leaf ageing on our current understanding of tropical leaf trait variation, chemometric models used to spectrally predict leaf traits, and together with oth...
Expand abstract
Collapse abstract

Actions

Email

Email this record

Send the bibliographic details of this record to your email address.

Your Email
Please enter the email address that the record information will be sent to.

-
Your message (optional)
Please add any additional information to be included within the email.
Share
Cite

Cite this record

APA Style

Chavana-Bryant, C. (2016). Impacts of leaf age on the spectral and physiochemical traits of trees in Amazonian forest canopies [PhD thesis]. University of Oxford.

MLA Style

Chavana-Bryant, C. Impacts of Leaf Age on the Spectral and Physiochemical Traits of Trees in Amazonian Forest Canopies. 2016. University of Oxford, PhD thesis.

Chicago Style

Chavana-Bryant, C. 2016. “Impacts of Leaf Age on the Spectral and Physiochemical Traits of Trees in Amazonian Forest Canopies.” PhD thesis, University of Oxford.
Print

Access Document

Files:: Thesis-Cecilia_Chavana-Bryant-Final-Copy.pdf

(Preview, pdf, 157.4MB, Terms of use)

Authors

+ Chavana-Bryant, C More by this author

Division:: SSD
Department:: SOGE
Department:: University of Oxford
Role:: Author

Contributors

+ Malhi, Y

Department:: University of Oxford
Role:: Supervisor

+ Gerard, F

Department:: Centre for Ecology & Hydrology
Role:: Supervisor

+ NERC TROBIT project student grant More from this funder

Funding agency for:: Chavana-Bryant, C
Grant:: NE/D005469/1

+ Centre National de la Recherche Scientifique (CNRS) Fieldwork (French Guiana) Grant More from this funder

Funding agency for:: Chavana-Bryant, C

+ NERC Field Spectroscopy Facility long-term equipment loans More from this funder

Funding agency for:: Chavana-Bryant, C

DOI:: 10.5287/ora-xox8z8qq1
Type of award:: DPhil
Level of award:: Doctoral
Awarding institution:: University of Oxford

UUID:: uuid:381dec4e-387a-4a10-b645-5a11d0c90b51
Deposit date:: 2017-07-17
ARK identifier:: ark:/29072/ora_381dec4e387a4a10b6455a11d0c90b51

Related item:: Convergence in relationships between leaf traits, spectra and age across diverse canopy environments and two contrasting tropical forests
Description:: Leaf age structures the phenology and development of plants, as well as the evolution of leaf traits over life histories. However, a general method for efficiently estimating leaf age across forests and canopy environments is lacking. Here, we explored the potential for a statistical model, previously developed for Peruvian sunlit leaves, to consistently predict leaf ages from leaf reflectance spectra across two contrasting forests in Peru and Brazil and across diverse canopy environments. The model performed well for independent Brazilian sunlit and shade canopy leaves (R2 = 0.75–0.78), suggesting that canopy leaves (and their associated spectra) follow constrained developmental trajectories even in contrasting forests. The model did not perform as well for mid-canopy and understory leaves (R2 = 0.27–0.29), because leaves in different environments have distinct traits and trait developmental trajectories. When we accounted for distinct environment–trait linkages – either by explicitly including traits and environments in the model, or, even better, by re-parameterizing the spectra-only model to implicitly capture distinct trait-trajectories in different environments – we achieved a more general model that well-predicted leaf age across forests and environments (R2 = 0.79). Fundamental rules, linked to leaf environments, constrain the development of leaf traits and allow for general prediction of leaf age from spectra across species, sites and canopy environments.

Terms of use

Copyright holder:: Chavana-Bryant, C

Licence:: Terms and Conditions of Use for Oxford University Research Archive

Views and Downloads

About views and downloads

If you are the owner of this record, you can report an update to it here: Report update to this record

Thesis

Impacts of leaf age on the spectral and physiochemical traits of trees in Amazonian forest canopies

Actions

Access Document

Authors

Contributors

Terms of use

Views and Downloads

Altmetrics

Dimensions

Thesis

Impacts of leaf age on the spectral and physiochemical traits of trees in Amazonian forest canopies

Actions

Access Document

Authors

Contributors

Funding

Bibliographic Details

Item Description

Related Items

Terms of use

Metrics

Views and Downloads

Altmetrics

Dimensions