Shift in the spectral position of chlorophyll bands in forest canopies affected by metal-induced stress. Salts of copper, zinc, and nickel in concentrations of 100 ppm metal in the soil appear to retard the development of chlorophyll in the laboratory plants. The metal effect causes the infrared chlorophyll edge to shift toward the short-wavelength end of the spectrum, the blue shift. This is similar to the blue shift observed over forest-covered mineral deposits.--Modified journal abstract.

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