Abstract
The present paper sums up the knowledge obtained from the study of growth periodicity in the underground organs ofPhragmites communisTrin. and from the analyses of differentPhragmites stands in three regions of Czechoslovakia. A period of intense growth ofPhragmites rhizomes was recorded in summer. Spring (end of April and beginning of May) and autumn (mainly September) seem to be the periods of most active root growth. During July and August, accumulation of reserve material takes place both in new and old rhizomes. In the stands investigated, the biomass ofPhragmites rhizomes varied from 2 kg/m2 to 5 kg/m2, and root dry weight from 0.08 kg/m2 to 3.6 kg/m2. The ratio of underground to total aboveground dry weight was highly variable (1.0 to 9.9). The estimated annual net rhizome production ofPhragmites, in two different stand, was 30% (Sakvický fishpond) and 60% (Nesyt fishpond) of the seasonal maximum above-ground biomass.
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