2008 | OriginalPaper | Buchkapitel
Growth Dynamics of Pistia stratiotes in Temperate Climate
verfasst von : Silvana Perdomo, Masanori Fujita, Michihiko Ike, Masafumi Tateda
Erschienen in: Wastewater Treatment, Plant Dynamics and Management in Constructed and Natural Wetlands
Verlag: Springer Netherlands
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In order to understand the growth dynamics of the floating macrophyte
Pistia stratiotes
under natural conditions in a temperate climate, and the influence of higher levels of N and P concentrations in water on the specific growth rate,
m
, a number of experiments were carried out in two series. Series I: 29 determinations of
m
in the stationary growth stage using an oligotrophic medium were carried out. The experimental data was fitted by a function which rules cyclic processes in wetlands (
R
= 0.93), and a maximum
m
of 0.0395 day
–1
over the year was calculated. Series II: several batch experiments were carried out in Osaka 34° northern latitude, and in Montevideo 34°50' southern latitude. The transitory stage of growth dynamics for plants, which were transferred to a medium with higher concentrations of N and P, was considered. In this case, the Double Monod model with double inhibition affected by a constant term adequately explains the variations in
m
with
R
= 0.85 and 0.88 at 24°C and 29°C respectively.