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- W2038331310 abstract "The accumulation of 137Cs in cryptogamic components of a tagged Liriodendron tulipifera L. forest at Oak Ridge, Tennessee, was determined in 1968. Within a 500 m2 study plot, tagged in 1962 with 467 mc 137Cs, terrestrial bryophytes had accumulated 1 16 mc, tree-base mosses 0 39 mc, epiphytic lichens on main stems 2 52 mc, and canopy lichens 0 16 mc. The total, 4.23 mc, is less than 1% of the total 137Cs introduced in 1962, but the 137Cs content of certain of the cryptogams was greater, on a unit dry weight basis, than tree foliage which represents the source of the radionuclide to the cryptogams. Terrestrial bryophytes receive all, or most, of their 137Cs directly from raindrip from the overhead tree canopies, and epiphytes receive their 137Cs from stemflow. Experimentally determined uptake efficiencies of 137Cs were 92% for the terrestrial bryophyte mat (living plus dead), and 67% for the vertically oriented epiphytic lichens, most of which were foliose Tree-base mosses plus their absorbent bark substrate absorbed 90% of the 137Cs supply. Loss rates of 137Cs by cryptogams were also determined experimentally The interpretation of uptake (or input) influences the calculation of loss rates If uptake is considered to be the total supply of 137Cs which reaches the cryptogams, loss rates will necessarily be higher than if uptake is that amount of 137Cs which reaches the cryptogams multiplied by an uptake fraction; the uptake fraction is determined experimentally Elimination halftimes are discussed in light of loss rate calculations A computer simulation of 137Cs accumulation by cryptogams from 1962 to 1969 was done to provide visual form to the process of accumulation by the cryptogamic components of the Liriodendron forest." @default.
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- W2038331310 date "1972-06-01" @default.
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- W2038331310 title "The Accumulation of Cesium-137 by Cryptogams in a Liriodendron tulipifera Forest" @default.
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- W2038331310 doi "https://doi.org/10.1086/336623" @default.
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