Seasonal effect of the exotic invasive plant Solidago gigantea on soil pH and P fractionsReportar como inadecuado

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* Corresponding author 1 Laboratory of Plant Genetics and Ecology 2 SEQBIO - Séquestration du carbone et bio- fonctionnement des sols : effets des modes de gestion des agro-écosystèmes tropicaux 3 Laboratory of Ecology

Abstract : 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 above- and belowground organs and in soil microbial biomass. Invaded plots had lower soil pH and 20%-30% higher labile P fractions resin-P-i, bicarb-P-i, 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.

Keywords : exotic species effects Early Goldenrod soil plant P cycling soil phosphorus availability microbial biomass P phosphomonoesterase

Autor: C. Herr - Lydie Chapuis Lardy - N. Dassonville - S. Vanderhoeven - P. Meerts -



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