Adventivpflanzen auf dem Magdeburger Domfelsen und ihr Turnover zwischen 2003 und 2020

The Domfelsen of Magdeburg is of interest because of its special multiple island position. It is a (pen)insula which is settled only sporadically by plants and a habitat island in urban surroundings. It differs remarkably from the gravel, torpedo sands and stone fills of the other parts of the banks. Furthermore a small-scale change between submers locations and drought stress is to state. Between 2003 and 2020 178 taxa were found whereas the distribution pattern per year of investigation when fallen dry shows multiple differences. Possible trends are discussed. 38,2 % of the spontaneous flora of the Domfelsen are adventive species. Most of the adventives are therophytes. Most of the 17 archaeophytes are annual (76,5%) and only some of them are hemicryptophytes. The life forms of the 51 neophytes cover a wide range from trees and shrubs to therophytes which are the largest group of this life forms (56,9 %). Most of the therophytes grow under normal conditions on moderate dry to fresh soils. This characterizes his special location very well. In 2019 occurred for the first time Panicum riparium, Salvia hispanica and Vitis vinifera. The turnover of neophytes is relatively high, in most of the years less than half of the total number of species are found. Till now 95 neophytes are documented at the banks of the river Elbe within the area of the city of Magdeburg: Acer negundo, Acer tataricum, Ailanthus altissima, Amaranthus emarginatus subsp. emarginatus, Amaranthus bouchonii, Amaranthus powellii, Amaranthus retroflexus, Ambrosia trifida, Amorpha fruticosa, Anaphalis margaritacea, Artemisia annua, Atriplex micrantha, Atriplex oblongifolia, Atriplex tatarica, Avena sativa, Bassia scoparia subsp. densiflora, Berteroa incana, Bidens frondosus, Bignonia speciosa, Brassica napus, Buddleja davidii, Cardaria draba, Celtis occidentalis, Centaurea diffusa, Centranthus ruber, Cerastium tomentosum, Citrullus lanatus, Colutea arborescens, Conyza canadensis, Cornus alba, Cucumis sativus, Cuscuta campestris, Cuscuta lupuliformis, Cymbalaria muralis, Cynodon dactylon, Datura stramonium, Diplotaxis tenuifolia, Echinochloa muricata, Echinocystis lobata, Epilobium ciliatum, Eragrostis albensis, Eragrostis monor, Erigeron annuus, Fallopia japonica, Ficus carica, Foeniculum vulgare, Galinsoga parviflora, Galinsoga quadriradiata, Geranium pyrenaicum, Helianthus annuus, Helianthus tuberosus s.l., Impatiens parviflora, Iva xanthifolia, Juglans regia, Lepidium densiflorum. Lepidium neglectum, Lindernia dubria, Lycium barbarum, Matricaria discoidea, Medicago x varia, Mimulus guttatus, Miscanthus sinensis, Nepeta x faassenii, Oenothera biennis agg., Panicum riparium, Parthenocissus inserta, Physalis peruviana, Physocarpus opulifolius, Plantago arenaria, Platanus x hispanica, Populus x canadensis, Potentilla intermedia, Potentilla norvegica, Pyracantha coccinea, Pyrus communis, Robinia pseudoacacia, Rosa rugosa, Rubus armeniacus, Rumex stenophyllus, Salvia hispanica, Sedum spurium, Senecio inaequidens, Senecio vernalis, Senecio vulgaris x S. verna lis, Sisymbrium loeselii, Solanum lycopersicon, Solidago canadensis, Solidago gigantea, Symphyotrichum spec., Syringa vulgaris, Tanacetum macrophyllum, Verbena bonarota, Viola x wittrockiana, Vitis vinifera, Xanthium albinum subsp. albinum. This high number attests the influence of gardens and public parks and areas on the flora of river banks within cities, well known from the upper course of the Elbe and Dresden as well as from other rivers.