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Monitoring invazních a nepůvodních rostlin v povodí řeky Ostravice
 Zlá, Kristýna
Spreading of invasive plants on catchment area of the Ostravice river has been monitored from fall 2013 to fall 2014. During the study period, 24 phytocenological images for 6 areas was obtained. The results were extended with data from the Czech National Phytosociological Database and comparative study of the spreading was performed for separate parts of the catchment area. In 211 phytosociological images analyzed in total, I have found 63 non-native species from which 23 was invasive. The most common invasive species was the Himalayan balsam (Impatiens glandulifera), Small balsam (Impatiens parviflora), the knotweed (Reynoutria spp.) and the Solidago canadensis (Solidago canadensis). Number of invasive species increased with decreasing altitude. River flow control and urbanization of nearby areas also had positive effects on the spreading. The study also revealed that occurrence of individual invasive species in coastal areas was different than their occurrence in more distant areas from the river basin.
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