%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Herr, C.
%A Chapuis Lardy, Lydie
%A Dassonville, N.
%A Vanderhoeven, S.
%A Meerts, P.
%T Seasonal effect of the exotic invasive plant Solidago gigantea on soil pH and P fractions
%D 2007
%L PAR00002355
%G ENG
%J Journal of Plant Nutrition and Soil Science Zeitschrift fur Pflanzenernahrung und Bodenkunde
%@ 1436-8730
%K exotic species effects ; Early Goldenrod ; soil plant P cycling ; soil phosphorus availability ; microbial biomass P ; phosphomonoesterase
%M CC:0002518485-0003
%N 6
%P 729-738
%R 10.1002/jpln.200625190
%U https://www.documentation.ird.fr/hor/PAR00002355
%V 170
%W Horizon (IRD)
%X 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.
%$ 068 ; 076