Early remote laser detection of vegetation damage caused by certain environmental stress factorsThe fluorescence spectra of plants excited with a pulsed nitrogen laser beam emitting at 337 nm were found to be related to plant type, as well as with changes in the physiology of the plant as the result of various kinds of environmental stress. The plant types which were studied included herbaceous dicots, monocots, hardwoods, and conifers. These plant types could be identified on the basis of differences in either the number of fluorescent bands, or the relative intensity of the bands. The dicots and monocots had fluorescent maxima at 440, 685, and 740 nm. The monocots could be distinguished from the dicots by virtue of having a much higher 440 nm/685 nm ratio. Hardwoods and conifers had an additional fluorescence band at 525 nm, but healthy conifers did not have a band at 685 nm.
Document ID
19900044943
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Chappelle, Emmett W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mcmurtrey, James E., III (USDA, Remote Sensing Research Institute, Beltsville MD, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: Laser Applications in Meteorology and Earth and Atmospheric Remote Sensing