Abstract
Biomass development and seasonal maximum above-ground biomass of the perennial Carex rostrata Stokes were studied in two different habitats for three years in central Sweden. In a mire with a small water level amplitude, the shoot size, density and seasonal maximum above-ground biomass of the species fluctuated only little between years. In a reservoir with a water level changing much within and between years, the shoot size and density of C. rostrata fluctuated, but in opposite directions so that the maximum above-ground biomass remained at the same level. The regulation of the development of new shoots under oligotrophic conditions with total biomass controlled by scarcity of plant nutrients is discussed. The highest record of above-ground biomass was 220 g m −2 in the shallow water area of the reservoir.
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