Detection of metal stress in boreal forest species using the 0.67-micron chlorophyll absorption bandSeveral recent studies have shown that a shift of the red-edge inflection near 0.70 micron in vegetation reflectance spectra is an indicator of metal stress, partially attributable to changes in chlorophyll concentration. This 'red-edge shift', however, is difficult to detect and has been reported both toward longer (red) and shorter (blue) wavelengths. Our work demonstrates that direct measurement of the depth and width of the chlorophyll absorption band at 0.67 micron using digital feature extraction and absorption band characterization procedures developed for the analysis of mineral spectra is a more consistent indicator of metal stress. Additionally, the magnitude of these parameters is generally greater than that of the red edge shift and thus should be more amenable to detection and mapping using field and aircraft spectrometers.
Singhroy, Vernon H. (Canada Centre for Remote Sensing Ottawa, United States)
Kruse, Fred A. (Cooperative Inst. for Research in Environmental Sciences; Colorado Univ. Boulder, United States)