Functional and biological diversity of foliar spectra in tree canopies throughout the Andes to Amazon region
Article first published online: 18 JUN 2014
© 2014 The Authors. New Phytologist © 2014 New Phytologist Trust
Volume 204, Issue 1, pages 127–139, October 2014
How to Cite
Asner, G. P., Martin, R. E., Carranza-Jiménez, L., Sinca, F., Tupayachi, R., Anderson, C. B. and Martinez, P. (2014), Functional and biological diversity of foliar spectra in tree canopies throughout the Andes to Amazon region. New Phytologist, 204: 127–139. doi: 10.1111/nph.12895
- Issue published online: 26 AUG 2014
- Article first published online: 18 JUN 2014
- Manuscript Accepted: 11 MAY 2014
- Manuscript Received: 28 FEB 2014
- Amazon basin;
- elevation gradient;
- leaf optical properties;
- tropical forest
- Spectral properties of foliage express fundamental chemical interactions of canopies with solar radiation. However, the degree to which leaf spectra track chemical traits across environmental gradients in tropical forests is unknown.
- We analyzed leaf reflectance and transmittance spectra in 2567 tropical canopy trees comprising 1449 species in 17 forests along a 3400-m elevation and soil fertility gradient from the Amazonian lowlands to the Andean treeline. We developed quantitative links between 21 leaf traits and 400–2500-nm spectra, and developed classifications of tree taxa based on spectral traits.
- Our results reveal enormous inter-specific variation in spectral and chemical traits among canopy trees of the western Amazon. Chemical traits mediating primary production were tightly linked to elevational changes in foliar spectral signatures. By contrast, defense compounds and rock-derived nutrients tracked foliar spectral variation with changing soil fertility in the lowlands. Despite the effects of abiotic filtering on mean foliar spectral properties of tree communities, the spectra were dominated by phylogeny within any given community, and spectroscopy accurately classified 85–93% of Amazonian tree species.
- Our findings quantify how tropical tree canopies interact with sunlight, and indicate how to measure the functional and biological diversity of forests with spectroscopy.