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Title: Phytoremediation : a tool for restoring land degraded due to opencast coal mining
Author: Desai, Mansi Anilkumar
Awarding Body: Oxford Brookes University
Current Institution: Oxford Brookes University
Date of Award: 2013
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This research set on a former reclaimed opencast coal spoil in Varteg Hills, South Wales, UK explores the phytoremediation potential of Alnus glutinosa (Alder), Betula pendula (Roth) (Birch) and Larix decidua (Larch), which are commonly used in UK land reclamation, to sequester metals: Zn, Cd, Mn, Pb and Cu, from mine spoils. This study also compares the abilities of newly planted trees to sequester metals-on a new experimental site, within the landscape and compares these with those from older plantations on adjoining land. This chronosequence is used to evaluate the overall impact of forestation on metals levels in soils over two decades. Metal concentrations in soil were measured over three years and those in tree leaves were measured over two years. The majority of the samples examined lie between the UK defined thresholds for contamination but below levels that trigger immediate action and treatment. Samples within this range are placed within a new 'critical soil' category. Mapping the spatial distribution of contaminants across selected test plots shows the presence of micro-scale contamination hotspots on these sites. These show that while such sites may, on average, have sub-critcial levels for metal contamination, they may still contain sections where contaminants reach very severe levels.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available