title: Effect of earthworm Eisenia fetida and wetland plants on nitrification and denitrification potentials in vertical flow constructed wetland.
abstract: The response of nitrification potentials, denitrification potentials, and N removal efficiency to the introduction of earthworms and wetland plants in a vertical flow constructed wetland system was investigated. Addition of earthworms increased nitrification and denitrification potentials of substrate in non-vegetated constructed wetland by 236% and 8%, respectively; it increased nitrification and denitrification potentials in rhizosphere in vegetated constructed wetland (Phragmites austrail, Typha augustifolia and Canna indica), 105% and 5%, 187% and 12%, and 268% and 15% respectively. Denitrification potentials in rhizosphere of three wetland plants were not significantly different, but nitrification potentials in rhizosphere followed the order of C. indica>T. augustifolia>P. australis when addition of earthworms into constructed wetland. Addition of earthworms to the vegetated constructed significantly increased the total number of bacteria and fungi of substrates (P<0.05). The total number of bacteria was significantly correlated with nitrification potentials (r=913, P<0.01) and denitrification potentials (r=840, P<0.01), respectively. The N concentration of stems and leaves of C. indica were significantly higher in the constructed wetland with earthworms (P<0.05). Earthworms had greater impact on nitrification potentials than denitrification potentials. The removal efficiency of N was improved via stimulated nitrification potentials by earthworms and higher N uptake by wetland plants.
authors.affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China. defuxu1@163.com
authors.forename: Defu
authors.initials: D
authors.lastname: Xu
authors.forename: Yingxue
authors.initials: Y
authors.lastname: Li
authors.forename: Alan
authors.initials: A
authors.lastname: Howard
authors.forename: Yidong
authors.initials: Y
authors.lastname: Guan
mesh_terms: D000818:Animals; D058440:Denitrification; D019684:Magnoliopsida / Q000737:chemistry / Q000378:metabolism; D058465:Nitrification; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism; D009835:Oligochaeta / Q000378:metabolism*; D006109:Poaceae / Q000737:chemistry / Q000378:metabolism; D053833:Wetlands
chemical_list: D009584:Nitrogen