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Title: Nutrient translocation in the outer canopy and understory of an eastern deciduous forest

The translocation of nutrients into and out of outer canopy leaves of ten eastern deciduous forest species was calculated from the temporal patterns of foliar nutrient pools sampled through a growing season. The calculations accounted for average chemical leaching effects due to rainfall. There were no significant differences in translocation rate between species within the evergreen, understory, or overstory-deciduous tree groups. Evergreen species had lower translocation rates than deciduous trees. Translocation rates into leaves of deciduous species showed a very rapid increase during spring; however, by late May, foliar phosphorus was being translocated at a slow rate back to stems. A similar trend was established for nitrogen by mid-June. An internal storage pool is suggested as the major source of foliar nitrogen during the spring flush since a simulation of nitrogen uptake from soil could only account for one-fourth of the quantity of nitrogen transported to leaves by the end of May. Simulation further showed that trace levels of soluble nitrogen (0.01 ppm) in soil were sufficient to supply a deciduous forest with an estimated nitrogen uptake of 100 kg N ha/sup -1/ year/sup -1/.
Authors:
; ;
Publication Date:
OSTI Identifier:
5761285
DOE Contract Number:
W-7405-ENG-26
Resource Type:
Journal Article
Resource Relation:
Journal Name: For. Sci.; (United States); Journal Volume: 27:3
Research Org:
Oak Ridge National Lab., TN
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; CALCIUM; TRANSLOCATION; MAGNESIUM; NITROGEN; PHOSPHORUS; POTASSIUM; SODIUM; SEASONAL VARIATIONS; COMPUTERIZED SIMULATION; FORESTS; KINETICS; LEACHING; LEAVES; PRODUCTIVITY; SPECIES DIVERSITY; STIMULATION; TREES; ALKALI METALS; ALKALINE EARTH METALS; DISSOLUTION; ELEMENTS; METALS; NONMETALS; PLANTS; SEPARATION PROCESSES; SIMULATION; VARIATIONS 550500* -- Metabolism