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    Author(s): John R. Donnelly
    Date: 1976
    Source: Res. Pap. NE-347. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 6p.
    Publication Series: Research Paper (RP)
    Station: Northeastern Research Station
    PDF: View PDF  (607.33 KB)

    Description

    Diurnal changes in carbohydrate concentrations in leaves and current-year stems of a mature sugar maple tree were studied in June and September. In leaves, alcohol-soluble sugar concentration was highest in the morning and lowest in late afternoon or early evening; diurnal changes in starch lagged about 5 hours behind changes in sugar. Carbohydrate concentrations in current-year stems did not vary diurnally. Leaves weighed much more than current-year stems and contained a higher concentration of sugar and starch. In leaves, sugar concentration was higher in September than it had been in June; starch concentration was much higher in June. The opposite was true for current-year stems; sugar concentration was slightly lower in September than it had been in June, but starch concentration was much higher.

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    Citation

    Donnelly, John R. 1976. Carbohydrate levels in current-year shoots of sugar maple. Res. Pap. NE-347. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 6p.

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