Hyperspectral remote sensing of canopy biodiversity in Hawaiian lowland rainforests

Kimberly M. Carlson, Gregory P. Asner, R. Flint Hughes, Rebecca Ostertag, Roberta E. Martin

Research output: Contribution to journalArticlepeer-review

138 Scopus citations

Abstract

Mapping biological diversity is a high priority for conservation research, management and policy development, but few studies have provided diversity data at high spatial resolution from remote sensing. We used airborne imaging spectroscopy to map woody vascular plant species richness in lowland tropical forest ecosystems in Hawai'i. Hyperspectral signatures spanning the 400-2,500 nm wavelength range acquired by the NASA Airborne Visible and Infrared Imaging Spectrometer (AVIRIS) were analyzed at 17 forest sites with species richness values ranging from 1 to 17 species per 0.1-0.3 ha. Spatial variation (range) in the shape of the AVIRIS spectra (derivative reflectance) in wavelength regions associated with upper-canopy pigments, water, and nitrogen content were well correlated with species richness across field sites. An analysis of leaf chlorophyll, water, and nitrogen content within and across species suggested that increasing spectral diversity was linked to increasing species richness by way of increasing biochemical diversity. A linear regression analysis showed that species richness was predicted by a combination of four biochemically-distinct wavelength observations centered at 530, 720, 1,201, and 1,523 nm (r 2 = 0.85, p < 0.01). This relationship was used to map species richness at approximately 0.1 ha resolution in lowland forest reserves throughout the study region. Future remote sensing studies of biodiversity will benefit from explicitly connecting chemical and physical properties of the organisms to remotely sensed data.

Original languageEnglish (US)
Pages (from-to)536-549
Number of pages14
JournalEcosystems
Volume10
Issue number4
DOIs
StatePublished - Jun 1 2007
Externally publishedYes

Keywords

  • AVIRIS
  • Biological diversity
  • Hawai'i
  • Imaging spectroscopy
  • Leaf pigments

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Environmental Chemistry
  • Ecology

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