Development of a model to select plants with optimum metal phytoextraction potential
- 664 Downloads
The aim of the present study is to propose a nonlinear model which provides an indicator for the maximum phytoextraction of metals to help in the decision-making process. Research into different species and strategies plays an important role in the application of phytoextraction techniques to the remediation of contaminated soil. Also, the convenience of species according to their biomass and pollutant accumulation capacities has gained important space in discussions regarding remediation strategies, whether to choose species with low accumulation capacities and high biomass or high accumulation capacities with low biomass.
The effects of heavy metals in soil on plant growth are studied by means of a nonlinear interaction model which relates the dynamics of the uptake of heavy metals by plants to heavy metal deposed in soil.
The model, presented theoretically, provides an indicator for the maximum phytoextraction of metals which depends on adjustable parameters of both the plant and the environmental conditions. Finally, in order to clarify its applicability, a series of experimental results found in the literature are presented to show how the model performs consistently with real data.
The inhibition of plant growth due to heavy metal concentration can be predicted by a simple kinetic model. The model proposed in this study makes it possible to characterize the nonlinear behaviour of the soil–plant interaction with heavy metal pollution in order to establish maximum uptake values for heavy metals in the harvestable part of plants.
KeywordsSoil pollution Metals Phytoremediation Phytoextraction Plant selection, modelling
This study was supported by the Xunta de Galicia in partnership with the University of Vigo through a Parga Pondal and Ángeles Alvariño contract awarded to E.F. Covelo and F.A. Vega, respectively.
- Adriano DC (1986) Trace elements in the terrestrial environment. Springer, New YorkGoogle Scholar
- Baker AJM (2002) The use of tolerant plants and hyperaccumulators. In: Wong MH, Bradshaw AD (eds) Restoration and management of derelict lands: modern approaches. World ScientiWc Publishing, Singapore, pp 138–148Google Scholar
- Baker AJM, Brooks RR (1989) Terrestrial higher plants which hyperaccumulate elements—a review of their distribution, ecology and phytochemistry. Biorecovery 1:81–126Google Scholar
- Blaylock MJ, Huang JW (2000) Phytoextraction of metals. In: Raskin I, Ensley BD (eds) Phytoremediation of toxic metals: using plants to clean up the environment. Wiley, New York, pp 53–70Google Scholar
- Chaney RL (1983) Plant uptake of inorganic waste constitutes. In: Parr JF, Marsh PB, Kla JM (eds) Land treatment of hazardous wastes. Noyes Data Corp, Park Ridge, NJ, pp 50–76Google Scholar
- Ghosh M, Singh SP (2005a) A review on phytoremediation of heavy metals and utilization of its byproducts. Appl Ecol Environ Res 3:1–18Google Scholar
- Ghosh M, Singh SP (2005b) Comparative uptake and phytoextraction study of soil induced chromium by accumulator and high biomass weed species. Appl Ecol Environ Res 3:67–79Google Scholar
- Hartman WJ Jr (1975) An evaluation of land treatment of municipal wastewater and physical citing of facility installations. US Department of Army, Washington, DCGoogle Scholar
- Li YM, Chaney RL, Angle JS, Baker AJM (2000) Phytoremediation of heavy metal contaminated soils. In: Wise DL, Trantolo DJ, Cichon EJ, Inyang HI, Stottmeister U (eds) Bioremediation of contaminated soils. New York, Marcel Dekker, pp 837–857Google Scholar
- Lindsay W (1979) Chemical equilibria in soils. Wiley, New YorkGoogle Scholar
- Reeves RD, Baker AJM (2000) Metal-accumulating plants. In: Raskin I, Ensley BD (eds) Phytoremediation of toxic metals: using plants to clean up the environment. Wiley, New York, pp 193–230Google Scholar
- Ulrich B, Pankrath J (1983) Effects of accumulation of air pollutants in forest ecosystems. Reidel, Dordrecht, NetherlandsGoogle Scholar
- Vassilev A, Schwitzguébel JP, Thewys T, van der Lelie D, Vangronsveld J (2004) The use of plants for remediation of metal-contaminated soils. TheScientificWorldJOURNAL 4:9–34Google Scholar