Vybrané biologické charakteristiky druhu bršlice kozí noha (Aegopodium podagraria L.) ve vztahu k expanzivní schopnosti druhu

Abstract

Aegopodium podagraria is a species from the family Apiaceae, very common in the Czech Republic. It occurs mostly on banks of rivers, in woodlands, and it is a weed in gardens and in fields. It belongs to plants with clonal growth, it spreads especially by rhizomes. Some aspects of its biology, which may influence competitive ability of this species – i.e. seed germination, production of above- and below- ground biomass, vegetative growth and regeneration after removal of aboveground biomass have been studied. Seeds of Aegopodium podagraria germinated only under field conditions, in the laboratory despite various conditions and temperature stratification there no seeds germinated. It corresponds with fact, that most clonal species disperse by vegetative growth and sexual reproduction is low by these species. Production of biomass differed between two stands. Production of above- and bellowground biomass was severalfold higher on the stand A (situated near the bank of the river) than on the stand B (in wet alder grove). Most bellowground biomass of Aegopodium podagraria is accumulated in the depht of soil between 0–5 cm. Vegetative growth of this species is very intensive, because a parent plant produced 8.2 daughter ramets on an average in first growing season. In the regeneration experiments was found that after double removal of aboveground biomass only 10–20 % ramets grow again on both stands. Results from experiments and some facts from literature were used to evaluate expansivity of this species in comparison with most expansive species in our country.