Abstract
Seasonal differences in concentration of potassium, calcium, magnesium, manganese and sodium are presented for an emergent macrophyte, Acorus calamus L. Photosynthetic, reproductive and underground organs are considered. A high correlation ( R 2 coeff. of multiple determination ⩾ .64) was found between the time of year and K in the above-ground organs, while the opposite trend was exhibited by Na which is significantly accumulated by the underground organs. A moderate ( R 2 = .44−.59) correlation was found between time of year and Ca concentration in both above- and underground organs. A moderate to high correlation was found between time of year and Mg and Mn concentration in above-ground organs, but both were poorly correlated in the underground organs ( R 2 < .40).
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