title: Phytoremediation potential of Pityrogramma calomelanos var. austroamericana and Pteris vittata L. grown at a highly variable arsenic contaminated site.
abstract: This study examined the phytoextraction potential of two arsenic (As) hyperaccumulators, Pteris vittata L. and Pityrogramma calomelanos var. austroamericana at a historical As-contaminated cattle dip site in northern New South Wales (NSW), Australia. Total As concentration in the surface soil (0-20 cm) showed a better spatial structure than phosphate-extractable As in the surface and sub-surface soil at this site. P. calomelanos var. austroamericana produced greater frond dry biomass (mean = 130 g plant(-1)) than P. vittata (mean = 81 g plant(-1)) after 10 months of growth. Arsenic concentration and uptake in fronds were also significantly higher in P. calomelanos var. austroamericana (means = 887 mg kg(-1) and 124 mg plant(-1)) than in P. vittata (means = 674 mg kg(-1) and 57 mg plant(-1)). Our results showed that under the field conditions and highly variable soil As at the site, P. calomelanos var. austroamericana performed better than P. vittata. We predict that P. calomelanos var. austroamericana would take approximately 100 years to reduce the total As to below 20 mg kg(-1) at the site compared to > or =200 years estimated for P. vittata. However, long-term data are required to confirm these observations under field conditions.
authors.affiliation: Faculty of Agriculture Food and Natural Resources, The University of Sydney, Sydney, Australia.
authors.forename: Nabeel Khan
authors.initials: NK
authors.lastname: Niazi
authors.forename: Balwant
authors.initials: B
authors.lastname: Singh
authors.forename: Lukas
authors.initials: L
authors.lastname: Van Zwieten
authors.forename: Anthony George
authors.initials: AG
authors.lastname: Kachenko
mesh_terms: D000818:Animals; D001151:Arsenic / Q000032:analysis / Q000378:metabolism*; D001673:Biodegradation, Environmental; D018533:Biomass; D002417:Cattle; D055598:Chemical Phenomena; D029624:Ferns / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D009517:New South Wales; D010575:Pesticides / Q000737:chemistry; D010710:Phosphates / Q000032:analysis / Q000378:metabolism*; D035261:Plant Components, Aerial / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism; D032495:Pteris / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D013997:Time Factors
chemical_list: D010575:Pesticides; D010710:Phosphates; D012987:Soil; D012989:Soil Pollutants; D001151:Arsenic