Physiological indicators of nitrogen response in short-rotation sycamore plantations. [Platanus occidentalis L]
- Oak Ridge National Lab., TN (USA)
American sycamore (Platanus occidentalis L.) seedlings were grown in the field under urea-nitrogen fertilization regimes to identify physiological variables that characterize the growth responses. Treatments included trees fertilized at the beginning of the growing season with 450 kg N/ha, trees fertilized periodically (three times during the growing season) at 37.5 kg N/ha, and unfertilized controls. Above ground biomass accumulation in the heaviest nitrogen treatment was three times that of the controls, and nearly as much growth occurred when less nitrogen was added periodically. Photosynthesis, chlorophyll concentrations, and growth increased rapidly after a midseason application of a small amount of nitrogen, but not to a late-season application. There was no evidence that fertilization extended the physiologically active season or increased susceptibility to drought or cold. Sycamore leaves accumulated sucrose and mannose in response to water and cold stress in all treatments. Photosynthetic pigment concentrations, net photosynthetic rate, and leaf nitrate reductase activity were sensitive indicators of nitrogen fertilization, but foliar concentrations of nitrate, total nitrogen, soluble carbohydrate and soluble protein were not.
- OSTI ID:
- 6993199
- Journal Information:
- Plant Physiology, Supplement; (USA), Journal Name: Plant Physiology, Supplement; (USA) Vol. 89:4; ISSN PPYSA; ISSN 0079-2241
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL EFFECTS
BIOMASS PLANTATIONS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLOROPHYLL
CULTIVATION TECHNIQUES
ELEMENTS
GROWTH
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NITROGEN
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYSIOLOGY
PHYTOCHROMES
PIGMENTS
PLANT GROWTH
PLANTS
PORPHYRINS
PROTEINS
SEEDLINGS
SHORT ROTATION CULTIVATION
SYCAMORES
SYNTHESIS
TREES