Abstract
Summary Effects of diurnal temperature fluctuations on the germination of 34 temperate Carex -species were investigated. Experiments were conducted on recently matured seeds at 22°C mean temperature with fluctuation amplitudes of 0° – 16°C, and at 22/10°C (15°C mean temperature) in light and darkness before and after a cold-wet stratification. At 22°C mean temperature, seed germination increased in almost all investigated species with increasing temperature amplitudes, in both light and darkness. The average germination percentage across all species was 29.4% in light and 5.1 % in darkness. The averaged amplitude required to reach 50% of maximum germination was 9.8°C. Species with little sensitivity to temperature fluctuation in light showed a clear sensitivity in darkness. The germination percentage was 4.0% for species with seed weights >0.9 mg and 23% for species with seed weights Carex species, thus suggesting that their germination behaviour was determined not only by habitat conditions.
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