title: Evaluation of two hybrid poplar clones as constructed wetland plant species for treating saline water high in boron and selenium, or waters only high in boron.
abstract: Wetland mesocosms were constructed to assess two hybrid poplar clones (Populustrichocarpa×P. deltoides×P. nigra '345-1' and '347-14') for treating saline water high in boron (B) and selenium (Se), and a hydroponic experiment was performed to test the B tolerance and B accumulation in both clones. In the mesocosm experiment, clone 345-1 exhibited no toxic symptoms at an EC of 10mScm-1, while clone 347-14 showed slight toxic symptoms at 7.5mScm-1. The removal percentages of B, Se, sodium (Na), and chloride (Cl) ranged from 26.7-45.6%, 50-69.4%, 18.4-24.0%, and 15.8-23.2%, respectively, by clone 345-1, and from 22.9-29.4%, 31.7-43.8%, 16.5-24.2%, and 14.9-23.9%, respectively, by clone 347-1. In the hydroponic experiment, B toxic symptoms were observed at treatments of 150 and 200mg B L-1for clones 345-1 and 347-14, respectively. The greatest leaf B concentrations of 3699 and 1913mgkg-1were found in clone 345-1 and clone 347-14, respectively. The translocation factor (TF) of clone 347-14 was less than clone 345-1. Clone 345-1 only showed significantly greater (P<0.05) B removal percentages than clone 347-14 when B treatment was <20mg B L-1. In conclusion, both tested poplar clones competitively accumulated and removed B and Se in constructed wetlands.
authors.affiliation: Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhu
authors.affiliation: USDA, Agricultural Research Service, San Joaquin Valley Agricultural Sciences Center, 9611 South Riverbend Avenue, Parlier, CA 93648-9757, USA. Electronic address: gary.banuelos@ars.usda.gov.
authors.forename: Gary
authors.initials: G
authors.lastname: Bañuelos
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D001895:Boron / Q000032:analysis / Q000302:isolation & purification* / Q000378:metabolism; D002712:Chlorides / Q000302:isolation & purification; D006824:Hybridization, Genetic; D018527:Hydroponics; D032107:Populus / Q000235:genetics / Q000378:metabolism*; D000068357:Saline Waters / Q000737:chemistry*; D012643:Selenium / Q000032:analysis / Q000302:isolation & purification* / Q000378:metabolism; D012964:Sodium / Q000302:isolation & purification; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification* / Q000378:metabolism; D053833:Wetlands
chemical_list: D002712:Chlorides; D014874:Water Pollutants, Chemical; D012964:Sodium; D012643:Selenium; D001895:Boron
keywords: Boron; Constructed wetlands; Poplar; Salinity; Selenium