High-spectral-resolution reflectance measurements of red spruce and eastern hemlock foliage over a growing season

摘要

Branch samples were collected from canopies of red spruce (Picea rubens) and eastern hemlock (Tsuga canadensis) on June 28, July 15 and September 6, 1990, and spectrally characterized by needle age class (first- and second-year). Spectral differences between spruce and hemlock first- and second-year branch segments include differences in green peak reflectance features, red edge parameters, and amplitude features of the NIR plateau. Second- year needles of both species exhibit decreased reflectance in the NIR when compared with first-year needles collected at the same time. It is also apparent from these data that phenological change has a dramatic impact on hyperspectral fine features, such as green peak and red edge parameters, as well as NIR plateau features.