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Science of The Total Environment
Vol. 576, 2017, Pages: 292–302

Phytostabilisation potential of giant reed for metals contaminated soil modified with complex organic fertiliser and fly ash: A field experiment

Ya-Nan Liu, Zhao-Hui Guo, Xi-Yuan Xiao, Shuo Wang, Zhi-Chao Jiang, Peng Zeng

Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, PR China.

Abstract

An orthogonal field experiment of giant reed (Arundo donax) modified with organic complex fertiliser (OCF), and OCF and fly ash (O&F), at different planting densities was carried out in metal-contaminated soil. The available percentage of arsenic (As) and lead (Pb) in soil decreased from 8.45% to 2.19% and from 29.6% to 13.5% by OCF, respectively, and that of cadmium (Cd) was reduced from 25.3% to 6.49% by O&F. The total biomass of giant reed was 631 g per individual following application of O&F in contaminated soil. The accumulation of As, Cd, and Pb in giant reed was 1.57, 4.06, and 11.25 mg per individual. Urease and sucrase activity were 87.4 NH4-N μg/g d and 63.1 glucose mg/g d in response to the treatments modified using OCF, while the highest dehydrogenase activity was 101 TPF (triphenyltetrazolium formazan) μg/g d in the treatments modified using O&F. Dominant bacteria (frequency > 50%) were enriched with increasing planting density of giant reed. These results indicate that the phytostabilisation of metal-contaminated soil by giant reed could be improved by the application of O&F or OCF.

Graphical abstract

Keywords: Eco-remediation; Metals; Metalloids; Arundo donax; Soil microbial diversity; Soil enzyme activity.

 
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