The load of invasive plants species in the Labe rlverbank vegetation

Abstract

The aim of this article is to summa actual results of the field research of invasive neophytes’ occurrence in the riverbank vegetation of the Labe River from Špinder Mlýn to Těchlovice (Děčín district). In total more than 190 km of the riverbank vegetation was mapped using author’s own method. The occurrence of 22 most important invasive neophytes (17 taxons) was registered for each of the 500 m long segments (in total 254 segments was mapped) The number specimen was registered using a logathmical scale and both simple and weighted index of total load of invasive neophytes as calculated for each segment. Results are prese0t for series (i. e. groups of neighbouring segments with similar geographical and ecological conditions) and also the comparison with other water sources in the Czech Republic is presented. The occurrence of invasive neophytes is near of the average for other water courses, but the number of specimen is lower. The most frequent taxons were Solidago sp. and Impatiens glanulifera. Mutual dependence between occurrence of invasive species and the vertical position of the segments of the water course wasn‘t confirmed. Development in the years 2006 and 2007 was compared, but only small changes was discovered in this short time horizon