H. Kuhl et al., STRATEGIES OF NITROGEN CYCLING OF PHRAGMITES-AUSTRALIS AT 2 SITES DIFFERING IN NUTRIENT AVAILABILITY, Internationale Revue der gesamten Hydrobiologie, 82(1), 1997, pp. 57-66
Below-ground biomass and nitrogen content were determined at two genet
ically homogenous Phragmites stands differing in morphology, in produc
tivity, and in nutrient supply. Comparable ration between above-ground
standing crop and rhizome biomass were found at both sites, whereas t
he root biomass/above standing crop ratio was significantly higher at
the nutrient poor site. Investigations on the dynamics of nitrogen con
tent revealed distinct differences in nitrogen translocation to the rh
izomes between the investigated clones indicating two ecophysiological
strategies in shortage behaviour. These two strategies could be attac
hed to the ''assimilation type'' and to the ''translocation type'', re
spectively. A modified definition of both types is presented.