Skip to Main Content
Remote sensing of native and invasive species in Hawaiian forestsAuthor(s): Gregory P. Asner; Matthew O. Jones; Roberta E. Martin; David E. Knapp; R. Flint Hughes
Source: Remote Sensing of Environment
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
Download Publication (1.0 MB)
DescriptionDetection and mapping of invasive species is an important component of conservation and management efforts in Hawai'i, but the spectral separability of native, introduced, and invasive species has not been established. We used high spatial resolution airborne imaging spectroscopy to analyze the canopy hyperspectral reflectance properties of 37 distinct species or phenotypes, 7 common native and 24 introduced tree species, the latter group containing 12 highly invasive species. Airborne Visible and Infrared Imaging Spectrometer (AVIRIS) reflectance and derivative-reflectance signatures of Hawaiian native trees were generically unique from those of introduced trees. Nitrogen-fixing trees were also spectrally unique from other groups of non-fixing trees. There were subtle but significant differences in the spectral properties of highly invasive tree species in comparison to introduced species that do not proliferate across Hawaiian ecosystems. The observed differences in canopy spectral signatures were linked to relative differences in measured leaf pigment (chlorophyll, carotenoids), nutrient (N, P), and structural (specific leaf area; SLA) properties, as well as to canopy leaf area index. These leaf and canopy properties contributed variably to the spectral separability of the trees, with wavelength-specific reflectance and absorption features that overlapped, but which were unique from one another. A combination of canopy reflectance from 1125–2500 nm associated with leaf and canopy water content, along with pigment-related absorption features (reflectance derivatives) in the 400–700 nm range, was best for delineating native, introduced, and invasive species. There was no single spectral region that always defined the separability of the species groups, and thus the full-range (400–2500 nm) spectrum was highly advantageous in differentiating these groups. These results provide a basis for more detailed studies of invasive species in Hawai'i, along with more explicit treatment of the biochemical properties of the canopies and their prediction using imaging spectroscopy.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationAsner, Gregory P.; Jones, Matthew O.; Martin, Roberta E.; Knapp, David E.; Hughes, R. Flint. 2008.Remote sensing of native and invasive species in Hawaiian forests. Remote Sensing of Environment. 112(5): 1912-1926. https://doi.org/10.1016/j.rse.2007.02.043.
KeywordsAVIRIS, Exotic species, Hawai'i, Imaging spectroscopy, Invasive species, Rainforest, Tropical forest
- A spectral mapping signature for the Rapid Ohia Death (ROD) pathogen in Hawaiian forests
- Invasive species detection in Hawaiian rainforests using airborne imaging spectroscopy and LiDAR
- Hyperspectral remote sensing of canopy biodiversity in Hawaiian lowland rainforests
XML: View XML