Vertikální distribuce podzemních orgánů Phalaris arundinacea a Urtica dioica v říční nivě: srovnání dvou metod

Vertical distribution of underground organs was studied in monospecific stands of Urtica dioica and Phalaris arundinacea and in a mixed stand of both species in the floodplain of the Lužnice River (South Bohemia, Czech Republic). The method of soil monolits and the profile wall method were used; both gave the same results for root distribution in deeper soil horizonts. Roots of both species were found in the whole soil profile down to the groundwater table. By the method of soil monolits, the rhizomes of P. arundinacea were found deeper than by the profile wall method. Both methods revealed a higher concentration of roots in the topsoil in the stand of U. dioica stand than in that of P. arundinacea. ln the shallowest soil layer, fewer roots were found by the profile wall method than by the method of soil monolits, probably because the finest roots were not recorded by the former. The profile wall method was less time-consuming and less demanding for special equipment than the method of soil monolits.