Reference : Seasonal Effect Of The Exotic Invasive Plant Solidago Gigantea On Soil Ph And P Fractions
Scientific journals : Article
Life sciences : Environmental sciences & ecology
Seasonal Effect Of The Exotic Invasive Plant Solidago Gigantea On Soil Ph And P Fractions
Herr, C. [> > > >]
Chapuis-Lardy, L. [> > > >]
Dassonville, N. [> > > >]
Vanderhoeven, Sonia mailto [Université de Liège > > Gembloux Agro-Bio Tech >]
Meerts, P. [> > > >]
Journal of Plant Nutrition and Soil Science-Zeitschrift Furpflanzenernahrung Und Bodenkunde
[en] exotic species effets ; early goldenrod ; soil-plant P cycling ; soil phosphorus availability ; microbial biomass P ; phosphomonoesterase
[en] Invasions by alien plants can alter biogeochemical cycles in recipient ecosystems. We test if early Goldenrod (Solidago gigantea) alters P fractions. To that end, we compare invaded
plots and adjacent, uninvaded resident vegetation for specific fractions of organic and inorganic P, phosphomonoesterase (PME) activity in topsoil, and immobilization of P in aboveand belowground organs and in soil microbial biomass. Invaded plots had lower soil pH and 20%–30% higher labile P fractions (resin-Pi, bicarb-Pi, NaOH-Pi), and the difference was consistent across seasons. There was no difference in microbial P. Alkaline-PME activity was 30% lower in topsoil of invaded plots. Annual P uptake in aboveground phytomass was not markedly higher in Solidago. In contrast, P in belowground organs steadily increased in autumn in invaded plots, due to both increased biomass and increased P concentrations. This indicated higher net P immobilization in Solidago, far in excess of both resorption from senescing shoots and P requirements for aboveground biomass in subsequent year. Higher turnover rates of P in belowground organs and mobilization of sparingly soluble P forms through rhizosphere acidification may be involved in the observed differences in soil P status between invaded and uninvaded plots.

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