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  • 1
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    Differential tolerance of coniferous species to the microbially produced herbicide bialaphos. II. Metabolic effects (1994)
    Canadian Science Publishing
    Details
    Publication Date: 1994-11-01
    Description: The effect of the microbially produced herbicide bialaphos on ammonium accumulation and photosynthesis of white spruce (Piceaglauca (Moench) Voss) and red pine (Pinusresinosa Ait.) seedlings was studied under controlled environmental conditions. Ammonium accumulation increased markedly during the first 48 h for seedlings treated in June and was greater in red pine than in white spruce. Ammonium accumulation also increased with higher doses of bialaphos. In contrast, the accumulation of ammonium following bialaphos application in August was minimal for both species and for doses up to an equivalent of 3.0 kg active ingredient (bialaphos) per hectare. Continuous measurements of photosynthesis for the first 12 h following bialaphos application showed a slight negative effect of the herbicide on photosynthetic activity within 2 h of treatment. The decrease was greater for red pine than for white spruce. Photosynthesis measurements taken under three different levels of photosynthetic photon flux density 24 h after bialaphos application showed a greater decline with increasing photosynthetic photon flux density and with higher doses of bialaphos. Furthermore, the decline was greater in red pine than it was in white spruce. When photosynthesis was followed over a 7-day period, a large decrease was observed during the first 24 h, after which time photosynthesis stayed relatively constant. The decrease was greater with higher doses and was greater for red pine than for white spruce. There was a strong negative correlation between photosynthetic rate at day 7 and both the dose of bialaphos and the development of chlorotic foliage. These results help provide a physiological basis for understanding previously reported morphological and growth responses.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 2
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    Profiles of photosynthetically active radiation, nitrogen and photosynthetic capacity in the boreal forest: Implications for scaling from leaf to canopy (1997)
    American Geophysical Union
    Details
    Publication Date: 1997-12-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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  • 3
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    BOREAS TE-9 NSA Canopy Biochemistry (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The BOREAS TE-9 team collected several data sets related to chemical and photosynthetic properties of leaves. This data set contains canopy biochemistry data collected in 1994 in the NSA at the YJP, OJR, OBS, UBS, and OA sites, including biochemistry lignin, nitrogen, cellulose, starch, and fiber concentrations. These data were collected to study the spatial and temporal changes in the canopy biochemistry of boreal forest cover types and how a high-resolution radiative transfer model in the mid-infrared could be applied in an effort to obtain better estimates of canopy biochemical properties using remote sensing. The data are available in tabular ASCII files. The data files are available on a CD-ROM (see document number 20010000884), or from the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).
    Keywords: Earth Resources and Remote Sensing
    Type: NASA/TM-2000-209891/VOL154 , NAS 1.15:209891/VOL154 , Rept-2000-03136-0/VOL154
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    BOREAS TE-9 NSA Leaf Chlorophyll Density (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The BOREAS TE-9 team collected several data sets related to chemical and photosynthetic properties of leaves in boreal forest tree species. These data were collected to help provide an explanation of potential seasonal and spatial changes of leaf pigment properties in boreal forest species at the NSA. At different dates (FFC-Winter, FFC-Thaw, IFC-1, IFC-2, and IMC-3), foliage samples were collected from the upper third of the canopy for five NSA sites (YJP, OJP, OBS, UBS, and OA) near Thompson, Manitoba. Subsamples of 100 needles for black spruce, 20 needles for jack pine, and single leaf for trembling aspen were cut into pieces and immersed in a 20-mL DMF aliquot in a Nalgene test tube. The extracted foliage materials were then oven-dried at 68 C for 48 hours and weighed. Extracted leaf dry weight was converted to a total leaf area basis to express the chlorophyll content in mg/sq cm of total leaf area. The data are provided in tabular ASCII files. The data files are available on a CD-ROM (see document number 20010000884), or from the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC).
    Keywords: Earth Resources and Remote Sensing
    Type: NASA/TM-2000-209891/VOL155 , NAS 1.15L209891/VOL155 , Rept-2000-03136-0/VOL155
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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