Kai Aulio, Shoot Growth in Typha angustifolia l. and Typha latifolia l. in the Kokemäenjoki River Delta Western Finland, ILNS Volume 28, International Letters of Natural Sciences (Volume 28)
https://www.scipress.com/ILNS.28.34
Abstract:
    The growth dynamics of two tall littoral helophytic plants, the narrow-leaved cattail (<i>Typha angustifolia </i>L.) and broad-leaved cattail (<i>Typha latifolia</i> L.; Typhaceae) were studied in the rapidly changing estuarine habitats in the Kokemäenjoki River delta, western Finland. The two cattails form uniform, single-species communities (monocultures) throughout the plant-covered estuary. Of the two taxa compared, the shoots were taller in <i>T. angustifolia</i> (mean 166 cm) than in <i>T. latifolia</i> (mean 120 cm<i>)</i>. But due to the robust leaves, the relation in the average weight of individual ramets was opposite: The mean weight of <i>T. angustifolia</i> was 9.6 g (dry wt), and that of <i>T. latifolia</i> was 16.5 g. In a separate study, the leaf height was compared between the fertile (flowering) and sterile (non-flowering) ramets. In flowering ramets the average leaf length was 35 cm taller in <i>Typha angustifolia</i> than in <i>T. latifolia</i>. The differences were even more pronounced in sterile ramets, where the leaves of <i>Typha angustifolia</i> were 70 cm taller than those of <i>T. latifolia</i>. The differences were statistically highly significant. Interspecific competition between the two <i>T</i><i>y</i><i>pha</i> species is negligible, because the microhabitats differ from each other. <i>T. angustifolia</i> grows in considerably deeper (mean depth 42 cm) waters than <i>T. latifolia</i> (mean depth 19 cm). The optimum range in the water depth is markedly stricter in <i>T. angustifolia</i> than in <i>T. latifolia</i>. The differences between the rooting depths of the two cattails were statistically highly significant. The physico-chemical characteristics of the rooting zones (rhizospheres) of the two cattails are similar, with the locally produced (autochthonous) organic matter dominating and determining the fertility of the habitats.
Keywords:
    Cattails, Kokemäenjoki River Delta, Macrophytes, <i>Typha angustifolia</i>, <i>Typha latifolia</i>, Wetlands