Phytoextraction of Cadmium and Zinc By Sedum plumbizincicola Using Different Nitrogen Fertilizers, a Nitrification Inhibitor and a Urease Inhibitor
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Publication Details
Author list: Arnamwong S., Wu L., Hu P., Yuan C., Thiravetyan P., Luo Y., Christie P.
Publisher: Taylor and Francis Group
Publication year: 2015
Journal: International Journal of Phytoremediation (1522-6514)
Volume number: 17
Issue number: 4
Start page: 382
End page: 390
Number of pages: 9
ISSN: 1522-6514
eISSN: 1549-7879
Languages: English-Great Britain (EN-GB)
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Abstract
Cadmium (Cd) and zinc (Zn) phytoavailability and their phytoextraction by Sedum plumbizincicola using different nitrogen fertilizers, nitrification inhibitor (dicyandiamide, DCD) and urease inhibitor (N-(n-Butyl) thiophosphoric triamide, NBPT) were investigated in pot experiments where the soil was contaminated with 0.99 mg kg−1 of Cd and 241 mg kg−1 Zn. The soil solution pH varied between 7.30 and 8.25 during plant growth which was little affected by the type of N fertilizer. The (NH4)2SO4+DCD treatment produced higher NH4 +−N concentrations in soil solution than the (NH4)2SO4 and NaNO3 treatment which indicated that DCD addition inhibited the nitrification process. Shoot Cd and Zn concentrations across all treatments showed ranges of 52.9–88.3 and 2691–4276 mg kg−1, respectively. The (NH4)2SO4+DCD treatment produced slightly higher but not significant Cd and Zn concentrations in the xylem sap than the NaNO3 treatment. Plant shoots grown with NaNO3 had higher Cd concentrations than (NH4)2SO4+DCD treatment at 24.0 and 15.4 mg kg−1, respectively. N fertilizer application had no significant effect on shoot dry biomass. Total Cd uptake in the urea+DCD treatment was higher than in the control, urea+NBPT, urea+NBPT+DCD, or urea treatments, by about 17.5, 23.3, 10.7, and 25.1%, respectively. © 2015, Copyright © Taylor & Francis Group, LLC.
Keywords
nitrification inhibitor, nitrogen fertilizers, Sedum plumbizincicola, zinc
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