Environmental and community controls on plant canopy chemistry in a Mediterranean-type ecosystem

Kyla M. Dahlin, Gregory P. Asner, Christopher B. Field

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

Understanding how and why plant communities vary across space has long been a goal of ecology, yet parsing the relative importance of different influences has remained a challenge. Species-specific models are not generalizable, whereas broad plant functional type models lack important detail. Here we consider plant trait patterns at the local scale and ask whether plant chemical traits are more closely linked to environmental gradients or to changes in species composition. We used the visible-to-shortwave infrared (VSWIR) spectrometer of the Carnegie Airborne Observatory to develop maps of four plant chemical traits-leaf nitrogen per mass, leaf carbon per mass, leaf water concentration, and canopy water content-across a diverse Mediterranean-type ecosystem (Jasper Ridge Biological Preserve, CA). For all four traits, plant community alone was the strongest predictor of trait variation (explaining 46-61% of the heterogeneity), whereas environmental gradients accounted for just one fourth of the variation in the traits. This result emphasizes the critical role that species composition plays in mediating nutrient and carbon cycling within and among different communities. Environmental filtering and limits to similarity can act strongly, simultaneously, in a spatially heterogeneous environment, but the local-scale environmental gradients alone cannot account for the variation across this landscape.

Original languageEnglish (US)
Pages (from-to)6895-6900
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number17
DOIs
StatePublished - Apr 23 2013
Externally publishedYes

Keywords

  • Community ecology
  • Hyperspectral remote sensing
  • Imaging spectroscopy
  • Plant functional traits

ASJC Scopus subject areas

  • General

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