Scale dependence of canopy trait distributions along a tropical forest elevation gradient

Gregory P. Asner, Roberta E. Martin, Christopher B. Anderson, Katherine Kryston, Nicholas Vaughn, David E. Knapp, Lisa Patrick Bentley, Alexander Shenkin, Norma Salinas, Felipe Sinca, Raul Tupayachi, Katherine Quispe Huaypar, Milenka Montoya Pillco, Flor Delis Ccori Álvarez, Sandra Díaz, Brian J. Enquist, Yadvinder Malhi

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Average responses of forest foliar traits to elevation are well understood, but far less is known about trait distributional responses to elevation at multiple ecological scales. This limits our understanding of the ecological scales at which trait variation occurs in response to environmental drivers and change. We analyzed and compared multiple canopy foliar trait distributions using field sampling and airborne imaging spectroscopy along an Andes-to-Amazon elevation gradient. Field-estimated traits were generated from three community-weighting methods, and remotely sensed estimates of traits were made at three scales defined by sampling grain size and ecological extent. Field and remote sensing approaches revealed increases in average leaf mass per unit area (LMA), water, nonstructural carbohydrates (NSCs) and polyphenols with increasing elevation. Foliar nutrients and photosynthetic pigments displayed little to no elevation trend. Sample weighting approaches had little impact on field-estimated trait responses to elevation. Plot representativeness of trait distributions at landscape scales decreased with increasing elevation. Remote sensing indicated elevation-dependent increases in trait variance and distributional skew. Multiscale invariance of LMA, leaf water and NSC mark these traits as candidates for tracking forest responses to changing climate. Trait-based ecological studies can be greatly enhanced with multiscale studies made possible by imaging spectroscopy.

Original languageEnglish (US)
Pages (from-to)973-988
Number of pages16
JournalNew Phytologist
Volume214
Issue number3
DOIs
StatePublished - May 1 2017

Keywords

  • Carnegie Airborne Observatory
  • Peru
  • canopy chemistry
  • plant functional traits
  • trait distributions
  • trait scaling

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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  • Cite this

    Asner, G. P., Martin, R. E., Anderson, C. B., Kryston, K., Vaughn, N., Knapp, D. E., Bentley, L. P., Shenkin, A., Salinas, N., Sinca, F., Tupayachi, R., Quispe Huaypar, K., Montoya Pillco, M., Ccori Álvarez, F. D., Díaz, S., Enquist, B. J., & Malhi, Y. (2017). Scale dependence of canopy trait distributions along a tropical forest elevation gradient. New Phytologist, 214(3), 973-988. https://doi.org/10.1111/nph.14068