Phytoplankton ecology of Lake Kivu (eastern Africa): biomass, production and elemental ratios

in Verhandlungen der Internationalen Vereinigung für Theoretische und Angewandte Limnologie = Proceedings of the International Association of Theoretical and Applied Limnology (2009, January), 30(5), 709-713

Phytoplankton ecology of Lake Kivu (eastern Africa): biomass, production and elemental ratios

Scientific conference (2007, October 01)

Phytoplankton of the River Loire, France: a biodiversity and modelling study

in Journal of Plankton Research (2011)

Most studies of phytoplankton dynamics in lowland rivers have been conducted in regulated rivers. This study deals the phytoplankton of the River Loire, a relatively unregulated river in Western Europe ... [more ▼]

Most studies of phytoplankton dynamics in lowland rivers have been conducted in regulated rivers. This study deals the phytoplankton of the River Loire, a relatively unregulated river in Western Europe, and aims at investigating the factors controlling phytoplankton composition and dynamics in this river. Phytoplankton biodiversity was assessed by pooling data from monthly sampling for 8 years at different sites. A correspondence analysis showed temporal and longitudinal gradients, with a dominance of small centric diatoms and green algae for most of the year, in the middle and lower river sectors. Phytoplankton dynamics were further explored using the POTAMON simulation model, run for the year 2005. The simulations, in agreement with the observations, confirmed the virtual absence of a Stephanodiscus spring peak, and reproduced well the development of small centric diatoms and green algae. Production and loss rates calculated by the model helped us to explain the dynamics of the three main phytoplankton categories, which attained high net production rates due to the low river depth (∼1 m at low discharge), but were subject to high sedimentation losses. Model calculations also showed that P limitation was likely, particularly for green algae, with a reduction of growth rate of up to 35%. In addition, the simulations showed a significant impact of the invasive Asian clam, Corbicula spp., on phytoplankton biomass. This study shows that the factors determining phytoplankton diversity and dynamics in this unregulated river are basically the same as those identified in other lowland rivers, but that key factors are habitat diversity and variation of water level in the river channel. [less ▲]

Phytoremediation of persistent organic pollutant in soils: study of the absorption mechanism in two cucurbitacean species and future applications

in Kaltsikes, P.J. (Ed.) Phytoremediation 2000 State of the art in Europe (2000, April 06)

La phytoremédiation par le saule

in Forêt Wallonne (2011), 112(mai/juin), 36-46

En Wallonie, les sites potentiellement contaminés se comptent par milliers. La région subit aujourd’hui les conséquences de son manque historique de législations environnementales. Parmi les contaminants ... [more ▼]

En Wallonie, les sites potentiellement contaminés se comptent par milliers. La région subit aujourd’hui les conséquences de son manque historique de législations environnementales. Parmi les contaminants présents sur ces sites, les plus préoccupants sont certainement les métaux lourds qui s’accumulent dans le sol et menacent l’environnement. Pour remédier à ce problème, certains chercheurs s’intéressent particulièrement à la phytoremédiation, une technologie nouvelle qui exploite le potentiel des végétaux et de leur microflore associée pour extraire, stabiliser ou volatiliser ces métaux lourds. Cette technique biologique s’avère prometteuse et son application à l’aide de ligneux, comme le saule, serait une solution favorable à la préservation de la biodiversité et au développement des matériaux et des énergies renouvelables. [less ▲]

PHYTOSTABILISATION OF COPPER-CONTAMINATED SOIL IN KATANGA: AN EXPERIMENT WITH THREE NATIVE GRASSES AND TWO AMENDMENTS

in International Journal of Phytoremediation (2010), 12(6), 616-632

This study evaluates the feasibility of using the grass species Rendlia altera, Monocymbium ceresiiforme, Cynodon dactylon and amendments (compost and lime) for the phytostabilisation of soils ... [more ▼]

This study evaluates the feasibility of using the grass species Rendlia altera, Monocymbium ceresiiforme, Cynodon dactylon and amendments (compost and lime) for the phytostabilisation of soils contaminated by Cu in the province of Katanga (Democratic Republic of Congo). Species were grown on control and Cu-contaminated plots (artificially contaminated with 2,500 mg kg-1 Cu) unamended (NA), amended with 4.5 kg compost m-2 or 0.2 kg lime m-2. R. altera was also grown on contaminated plots amended with 22.5 kg compost m-2 or 1 kg lime m-2. Plant survival, growth and reproduction were monitored for two years. Cu-concentration in leaves of R. altera and M. ceresiiforme were analysed. pH and extractable Cu (0.01 M CaCl2) in soil were analysed in April 2007 and 2008. Results showed that R. altera seems to be the best candidate because of its highest survival on NA, followed by M. ceresiiforme, while liming was necessary to ensure survival of C. dactylon. Lime increased plant reproduction and reduced Cu accumulation in leaves compared to compost. However, higher survival and number of spikes of R. altera obtained in experiment 2 with 22.5 kg compost m-2 suggest that lime x compost interactions should be investigated in further studies. [less ▲]

Phytotechnie des céréales

in Livre Blanc: Céréales - Gembloux (1988, February 25)

Phytotechnie des céréales

in Livre Blanc: Céréales - Gembloux (1987, February 26)

Phytotechnie des céréales: 1. Le semis, la fumure azotée, les variétés

in Fumure et protection phytosanitaire des céréales (1984, February)

Phytotechnie des céréales: 2. les céréales de printemps (froment, avoine, orge) et le triticale

in Fumure et protection phytosanitaire des céréales (1985, February 26)