Herr C., Chapuis Lardy Lydie, Dassonville N., Vanderhoeven S., Meerts P. (2007). Seasonal effect of the exotic invasive plant Solidago gigantea on soil pH and P fractions. Journal of Plant Nutrition and Soil Science Zeitschrift fur Pflanzenernahrung und Bodenkunde, 170 (6), p. 729-738. ISSN 1436-8730.
Titre du document
Seasonal effect of the exotic invasive plant Solidago gigantea on soil pH and P fractions
Année de publication
Herr C., Chapuis Lardy Lydie, Dassonville N., Vanderhoeven S., Meerts P.
Journal of Plant Nutrition and Soil Science Zeitschrift fur Pflanzenernahrung und Bodenkunde, 2007,
170 (6), p. 729-738 ISSN 1436-8730
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.
Plan de classement
Sciences du monde végétal