Tree species effect on the redistribution of soil metals.
Phytostabilization of metals using trees is often promoted although the influence of different tree species on the mobilization of metals is not yet clear. Soil and biomass were sampled 33 years after planting four tree species (Quercus robur, Fraxinus excelsior, Acer pseudoplatanus, Populus 'Robusta') in a plot experiment on dredged sediment. Poplar took up high amounts of Cd and Zn and this was associated with increased Cd and Zn concentrations in the upper soil layer. The other species contained normal concentrations of Cd, Cu, Cr, Pb and Zn in their tissues. Oak acidified the soil more than the other species and caused a decrease in the concentration of metals in the upper soil layer. The pH under poplar was lower than expected and associated with high carbon concentrations in the top soil. This might be assigned to retardation of the litter decomposition due to elevated Cd and Zn concentrations in the litter.
Mertens
Jan
J
Laboratory of Forestry, Department of Forest and Water Management, Ghent University, Geraardsbergsesteenweg 267, B-9090 Melle, Belgium. jan.mertens@ugent.be
Van Nevel
Lotte
L
De Schrijver
An
A
Piesschaert
Frederic
F
Oosterbaan
Anne
A
Tack
Filip M G
FM
Verheyen
Kris
K
D031002:Acer / Q000737:chemistry; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods*; D031661:Fraxinus / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D019216:Metals, Heavy / Q000032:analysis*; D032107:Populus / Q000737:chemistry; D029963:Quercus / Q000737:chemistry; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D013045:Species Specificity; D013997:Time Factors; D014197:Trees / Q000737:chemistry*; D015032:Zinc / Q000032:analysis
D007220:Industrial Waste; D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D015032:Zinc