Effect of Organic Amendment on the Physicochemical Characteristics of Tailings Dam Soil and Root Development of Tree Species, Fifteen Years After Planting
trace metal, tailings, amendment, tree species, reclamation
Abstract :
[en] Among mine wastes, tailings are known to have the largest environmental impact, as they have high concentrations of trace elements and are susceptible to wind dispersal and water erosion. A tree plantation trial was installed at Kipushi tailing (DR Congo) in order to mitigate the contaminant dispersal in the surrounding areas. Fifteen years later, the present study was conducted for the purpose of investigating the macronutrient and metal content in amended holes and assessing the performance of tree species through root behavior in the tailings dams. Results show elevated available P, K, Ca, and Mg concentration in the surface and amended layers, which is higher than the unpolluted soil of the miombo woodland. Trace metals were manifold higher compared to the pedo-geochemical background of the region, with Cu and Co concentration tending to increase in the organic matter-rich layers, while Zn, Cd, Pb, and As remained higher in tailings. Compared to the tailing layer, roots grew well in the amended layers, but few roots ranging from very fine to big from all the surviving species were able to grow beyond the amended layers, indicating the possibility of tree survival on the tailings dams over many years. Acacia polyacantha and Psidium guajava are species that showed a higher quantity of roots in the unamended tailing layers. Leaves should be avoided for human or animal consumption, but as the concentration of Cu, Zn, and Co in guava was lower, there is no indication of hazards in case of their consumption. Therefore, the use of well-adapted tree species on the mix-up of the organic amendments with the uncontaminated topsoil seemed to be a good technique for the reclamation of larger polluted areas.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Kilela Mwanasomwe, Jacques ; Université de Liège - ULiège > TERRA Research Centre > Echanges Eau - Sol - Plantes
Langunu, Serge ; Université de Liège - ULiège > TERRA Research Centre
Nkulu, Salvatora Nsenga
Shutcha, Mylor Ngoy
Colinet, Gilles ; Université de Liège - ULiège > Département GxABT > Echanges Eau - Sol - Plantes
Language :
English
Title :
Effect of Organic Amendment on the Physicochemical Characteristics of Tailings Dam Soil and Root Development of Tree Species, Fifteen Years After Planting
Alternative titles :
[fr] Effet de l'amendement organique sur les caractéristiques physicochimiques des rejets et le développement racinaire des espèces d'arbres, quinze ans après la plantation.
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