Abstract
AbstractThe utility of remote sensing technique to discriminate Asparagus laricinus from adjacent land cover types using a field spectrometer data was explored in this study. Analysis made use of original spectra and spectra simulated based on Landsat and SPOT 5 bands. Comparisons were made at individual and plot levels using original spectra, and individual and group level using simulated spectra. The near-infrared region showed consistent significant differences between A. laricinus and adjacent land cover types at the individual level analysis. In particular, Landsat- and SPOT 5-simulated spectra showed significant differences in only the NIR band. The findings suggest the potential of upscaling field-based data into airborne or spaceborne remote sensing techniques with more emphasis on the NIR band. However, more studies need to be undertaken that will make up for the shortcomings encountered in this study. In this regard, improvements can be made using large number of samples, stratifying target plan...
Highlights
Invasive alien plants are a growing global concern (Richardson & Van Wilgen, 2004; Rouget, Hui, Renteria, Richardson, & Wilson, 2015; Schor, Farwig, & Berens, 2015; Vicente et al, 2013)
Individual-level comparisons between A. laricinus and adjacent land cover types resulted in an overall significant difference in all plots for each spectral region, based on analysis of variance (ANOVA) results
A. laricinus reflectance was high in all regions when compared with herbaceous, while it was high in ultraviolet–visible, NIR, and NIR–SWIR when compared with mixture of bare ground and herbaceous plants, but it was low in all regions when compared with Acacia
Summary
Invasive alien plants are a growing global concern (Richardson & Van Wilgen, 2004; Rouget, Hui, Renteria, Richardson, & Wilson, 2015; Schor, Farwig, & Berens, 2015; Vicente et al, 2013). We are conducting research work on plant invasions in the Kliprivierberg Nature Reserve and we aim toward developing distribution maps of invasive plant infestation that will be helpful in the design of better management strategies by the reserve managers. Such maps are valuable to land managers for the timely information they provide on the distribution of the species, aid in development of better management strategies of the species
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