Relative water content of Spruce needles determined by the leaf water content indexLeaf relative water content (RWC) is defined as the volume of water in a leaf divided by the volume at full turgor. Using reflectance factors of wavelengths 0.83 micron and 1.6 microns, a Leaf Water Content Index (LWCI) was derived from the Lambert-Beer Law such that LWCI should equal RWC; LWCI was equal to RWC for Picea pungens, Picea rubens, Liquidambar styraciflua, and Quercus agrifolia. Algebraic manipulation shows that R(1.6)/R(0.83) termed the Moisture Stress Index (MSI), is near-linearly correlated to RWC and to the Equivalent Water Thickness (EWT). Five species tested so far had the same relationship between MSI and EWT, but EWT is not a measure of plant water status.
Document ID
19890023641
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hunt, E. Raymond, Jr. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wong, Sam K. S. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Rock, Barrett N. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: International Symposium on Remote Sensing of Environment