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Seed germination and seedling recruitment of Iris sibirica depending on the type of management
HOŘEJŠÍ, Edita
This work continue on a bachelor's work which investigated production characteristics of the plant species Siberian Iris (Iris sibirica). The aims of the presented work are reproductive properties by seeds of Siberian Iris in relation to the seed germination and with various meadow managements. Seeds of Siberian Iris (collected in 2015 and 2016) were investigated in laboratory condition and at meadow near the pond Dolní Stržený (Dlouhá Lhota, of the Tábor District). Seeds were divided into groups according to 4 treatments: without intervention, scarification, thermal stratification and cold stratification. The field experiment runs from September 2016 to August 2017.The aim was to find out the most appropriate type of management (mowing, disturbance) that would promote seed germination and seedling recruitment. Results from the both experiments: a positive effect of germination after the scarification, better recruitment of seeds in square without intervention, seeds probably needs to be stored for a longer period before sowing. These results cannot be generalized, because small number of repetitions were performed. All the obtained data was discussed and recommendations for the plant management were formulated.
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Contribution to the productive characteristics of Siberian iris (Iris sibirica L.)
HOŘEJŠÍ, Edita
Monitoring of Iris sibirica populations was carried out in four localities in Tabor area in South Bohemia. At each locality two plant clusters were chosen. Measured characteristics were: number of stalks, height of the both 20 sterile and 10 fertile stalks, number of flowers and fruits per a shoot, number of seeds per a fruit, and timing of phenological phases. Phytocenological pictures, soil parameters as humidity, conductivity, temperature were obtained from all localities. The observations and measurements were carried out from May to August 2015. Iris sibirica grows in the meadows of the union Molinion. During the monitoring it was found, that the water level has an impact on the quality of populations. Locality at Turovec, which was most of the time flooded, had fewer larger clumps, less sterile and fertile stems and almost zero production of capsules, compared to other localities that were only slightly waterlogged. Collected seeds manifested no signs of viability (TTC test). All obtained data were discussed and some recommendations were formulated (longer-term monitoring, regular mowing in the late summer).
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