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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 4 (1983), S. 137-144 
    ISSN: 1573-5079
    Keywords: 14CO2 uptake ; C3/C4 photosynthesis ; canopy photosynthesis ; distribution of 14CO2 uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of net photosynthetic activity of leaves was measured in a mixed grass (Setaria sphacelata var. sericea)-legume (Desmodium intortum) pasture stand using a method based on concurrent measurement of the rate of CO2 exchange, and 14CO2 dosing followed by rapid harvesting according to height strata. Comparisons were also made between plots which differed in the period of regrowth following defoliation. The usual superiority of leaf net photosynthetic rates of a C4 grass, compared with C3 legume leaves, was found in the upper, well illuminated strata. These rates were, however, much lower than those usually described for horizontally exposed leaves, primarily because leaves in the pasture stand were inclined to the horizontal. At greater depth in the canopies, the superiority of rates in the grass was less evident, and consequently the relative contributions of grass and legume to canopy photosynthesis became more dependent on their leaf area indices. Attention is drawn to the relative simplicity of the method for examining the contribution of leaves, which may differ according to species or position in the canopy, to productivity of the whole stand.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 1 (1981), S. 243-249 
    ISSN: 1573-5079
    Keywords: C4 grass ; C3 legume ; light utilization efficiency ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of temperatures between 15 and 50°C on the light utilization efficiency of leaf net photosynthesis was studied in two C4 grasses and two C3 legumes. In the legumes, light utilization efficiency (μ mol of CO2 fixed per μ Einstein of incident photosynthetic quantum flux) declined linearly with temperature between 15 and 45°C. On the other hand, it was independent of temperature between 15 and 40°C in the grasses, but it declined rapidly between 40 and 50°C. Values for grasses were greater than those for legumes at all temperatures; for example, at 30°C the ratio of the mean values of grass to legume was 1.6–1.7 which is similar to a previously published value of 1.6. Light utilization efficiency was similar for grasses and legumes only at temperatures below 10 and above 50°C. These findings are compared with published data, especially those of Ehleringer and Björkman, and their implications for predicting or interpreting the distribution of C3 and C4 species are briefly discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 4 (1983), S. 137-144 
    ISSN: 1573-5079
    Keywords: 14CO2 uptake ; C3/C4 photosynthesis ; canopy photosynthesis ; distribution of 14CO2 ; uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of net photosynthetic activity of leaves was measured in a mixed grass (Setaria sphacelata var. sericea)-legume (Desmodium intortum) pasture stand using a method based on concurrent measurement of the rate of CO2 exchange, and 14CO2 dosing followed by rapid harvesting according to height strata. Comparisons were also made between plots which differed in the period of regrowth following defoliation. The usual superiority of leaf net photosynthetic rates of a C4 grass, compared with C3 legume leaves, was found in the upper, well illuminated strata. These rates were, however, much lower than those usually described for horizontally exposed leaves, primarily because leaves in the pasture stand were inclined to the horizontal. At greater depth in the canopies, the superiority of rates in the grass was less evident, and consequently the relative contributions of grass and legume to canopy photosynthesis became more dependent on their leaf area indices. Attention is drawn to the relative simplicity of the method for examining the contribution of leaves, which may differ according to species or position in the canopy, to productivity of the whole stand.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
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