Abstract
AbstractRetention of K, Ca and Pby Pseudoscleropodium purum growing under oak in Windsor Forest was examined following treatment, over 9 days, with 10 mol m−3 CaCl2 or KH2PO4 Concentrations of the added elements and Mg were determined in the intercellular, exchangeable (cell wall) and intracellular fractions of the green tissues before nutrient addition and at intervals (0–205 days) afterwards.Increases of cations in the intercellular fraction of treated shoots were transient. Addition of K and Ca markedly increased levels of these cations in the exchangeable fraction and significantly reduced the concentration of exchangeable Mg. The changes in exchangeable cations were progressively reversed under field conditions indicating that their levels are in dynamic equilibrium with element concentrations in precipitation and/or throughfall rather than the result of a continuousaccumulation process.Net uptake of K and Ca into the protoplasts of treated P. purum was slight but substantial net gain (+178%) of P oc...
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