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Phytoremediation potential of Leucaena leucocephala (Lam.) de Wit. for heavy metal-polluted and heavy metal-degraded environments.
Department of Plant Sciences, Microbiology and Biotechnology, Makerere University, Kampala, Uganda.
Department of Chemistry, Makerere University, Kampala, Uganda.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution. School of Natural Sciences, Technology and Environmental Studies, Södertörn University College, Huddinge, Sweden.
Department of Plant Sciences, Microbiology and Biotechnology, Makerere University, Kampala, Uganda.
2017 (English)In: Phytoremediation potential of bioenergy plants / [ed] K. Bauddh, B. Singh & J. Korstad, Springer, 2017, 189-209 p.Chapter in book (Other academic)
Abstract [en]

Regeneration of heavy metal-polluted and heavy metal-degraded sites has remained a global challenge despite the existence of numerous conventional physico-chemical techniques that can be applied. In view of the large size of the degraded areas and the cost implications, the application of the inexpensive “green” and sustainable technique of phytoremediation is unrivalled by any other possible alternative techniques. However, its effectiveness is largely dependent on judicious selection of the plant to be used. We thus assessed the suitability of Leucaena leucocephala for phytoremediation of heavy metal-polluted and heavy metal-degraded sites. L. leucocephala has numerous inherent characteristics that can be exploited to augment phytoremediation and lower the cost of regenera- tion. The species can survive in harsh environmental conditions with the excep- tion of heavily frosted conditions and occurs in a wide range of ecological settings. The species is fast growing, capable of reaching maturity in 6 to 7 months to produce a vast amount of seeds that can germinate into numerous seedlings to carry on further remediation of the polluted site. It can produce large quantities of phytomass that can accumulate heavy metals and can repeatedly be harvested to regenerate a polluted area through phytoextraction. Heavy metal- laden phytomass of L. leucocephala moulds into furniture and is used for con- struction to preclude contamination at the site of use. It is excellent on coppicing, thus eliminating the costs of replanting during the phytoremediation programme. The species is endowed with high pro ciency for nitrogen xation through nod- ule formation and can substantially revitalize microbial mass and micro- bioactivities to pave way for re-establishment of self-sustaining plant communities over the polluted sites. Its exibility to nodulate with rhizobia of other legumes and its rhizobia to nodulate with other legumes could optimize nitrogen content revitalization of the polluted soils. However, the species is invasive and could be adopted under stringent measures to avoid its spread. It is also very palatable to animals and may thus be of limited application in the phytoremediation of areas accessible to animals. Suitability of the species in heavily polluted areas is mini- mal as many of the inherent characteristics may not fully be expressed. 

Place, publisher, year, edition, pages
Springer, 2017. 189-209 p.
Keyword [en]
Bioenergy plants Phytoremediation Restoration Heavy metals Phytosiderophore Hyper-accumulation
National Category
Environmental Engineering
Identifiers
URN: urn:nbn:se:uu:diva-319269DOI: 10.1007/978-981-10-3084-0_7ISBN: 978-981-10-3083-3 (print)ISBN: 978-981-10-3084-0 (electronic)OAI: oai:DiVA.org:uu-319269DiVA: diva2:1086447
Funder
Sida - Swedish International Development Cooperation Agency
Available from: 2017-04-03 Created: 2017-04-03 Last updated: 2017-04-28Bibliographically approved

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