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—Radiative transfer theory and modeling assumptions were applied at laboratory and field scales in order to study the link between leaf reflectance and transmittance and canopy hyper-spectral data for chlorophyll content estimation. This study was focused on 12 sites of Acer saccharum M. (sugar maple) in the Al-goma Region, Canada, where field measurements,(More)
Physical principles applied to remote sensing data are key to successfully quantifying vegetation physiological condition from the study of the light interaction with the canopy under observation. We used the fluorescence-reflectance-transmittance (FRT) and PROSPECT leaf models to simulate reflectance as a function of leaf biochemical and fluorescence(More)
Relationships found between Compact Airborne Spec-fluorescence: the curvature index R683 2 /(R675·R691) and trographic Imager (CASI) hyperspectral canopy reflec-the R685/R655 ratio calculated from the canopy reflec-tance measurements at laboratory and field levels with tance are related to leaf-measured Ft, FmЈ and ⌬F/FmЈ PAM-2000 chlorophyll fluorescence(More)
  • M. R. Becwar, T. L. Noland, S. R. Wann
  • 1987
A method for quantitative determination of the level of somatic embryogenesis in Norway spruce embryogenic callus is described. Embryogenic callus was dispersed in liquid by agitation and plated in a thin layer of medium containing 0.6% low melting point agarose. The number of embedded somatic embryos per mg of callus ranged from 0.2 to 1.5 among 11(More)
This paper reports a series of laboratory and field measurements of spectral reflectance under artificial and natural light conditions which demonstrate that effects of natural chlorophyll fluorescence are observable in the reflectance red edge spectral region. These are results from the progress made to link physiologically-based indicators to optical(More)
  • Michael R. Becwar, Thomas L. Noland, Judith L. Wyckoff
  • 2007
Quantitative data are presented on the efficiency of three stages of plant regeneration from somatic embryos of Norway spruce (Picea abies L.): 1) Maturation, the development of immature embryos to the cotyledonary stage; 2) Germination, primary root growth; and 3) Conversion, plantlet survival and continued growth in nonaxenic conditions. Maturation(More)
  • S. R. Wann, M. A. Johnson, T. L. Noland, J. A. Carlson
  • 1987
Both embryogenic and nonembryogenic calli of Picea abies (L.) Karst. were initiated from the hypocotyl region of immature embryos. The two callus phenotypes were manually separated and subsequently maintained independently, but under identical culture conditions. Biochemical analysis of the two phenotypes revealed significant differences in ethylene(More)
When dormant sugar pine (Pinus lambertiana L.) seeds were imbibed at 5 degrees C, they showed a rapid increase in O(2) uptake, ATP level, and moisture content during the first 4 days. This was followed by a plateau phase until 60 days, after which a second significant increase in all three features occurred as dormancy was broken. During the plateau phase,(More)
Information on foliar macronutrients is required in order to understand plant physiological and ecosystem processes such as photosynthesis, nutrient cycling, respiration and cell wall formation. The ability to measure, model and map foliar macronutrients (nitrogen (N), phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg)) at the forest canopy(More)
The effect of the seed cut of the uniform shelterwood silvicultural system on white pine seed production, seed characteristics, and seed viability during 2 mast seeding events was examined in operationally harvested second growth, white pine-dominated forest stands in central Ontario. Seed traps placed along transects in unmanaged and shelterwood stands in(More)