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Unique Organic Matter and Microbial Properties in the Rhizosphere of a Wetland Soil.
Kaplan, Daniel I; Xu, Chen; Huang, Shan; Lin, Youmin; Tolic, Nikola; Roscioli-Johnson, Kristyn M; Santschi, Peter H; Jaffé, Peter R.
Afiliação
  • Kaplan DI; Savannah River National Laboratory , Aiken, South Carolina 29808, United States.
  • Xu C; Texas A&M University , Galveston, Texas 77553, United States.
  • Huang S; Princeton University , Princeton, New Jersey 08540, United States.
  • Lin Y; Texas A&M University , Galveston, Texas 77553, United States.
  • Tolic N; Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory , Richland, Washington 99352, United States.
  • Roscioli-Johnson KM; Idaho National Laboratory , Idaho Falls, Idaho 83415, United States.
  • Santschi PH; Texas A&M University , Galveston, Texas 77553, United States.
  • Jaffé PR; Princeton University , Princeton, New Jersey 08540, United States.
Environ Sci Technol ; 50(8): 4169-77, 2016 Apr 19.
Article em En | MEDLINE | ID: mdl-27091553
Wetlands attenuate the migration of many contaminants through a wide range of biogeochemical reactions. Recent research has shown that the rhizosphere, the zone near plant roots, in wetlands is especially effective at promoting contaminant attenuation. The objective of this study was to compare the soil organic matter (OM) composition and microbial communities of a rhizosphere soil (primarily an oxidized environment) to that of the bulk wetland soil (primarily a reduced environment). The rhizosphere had elevated C, N, Mn, and Fe concentrations and total bacteria, including Anaeromyxobacter, counts (as identified by qPCR). Furthermore, the rhizosphere contained several organic molecules that were not identified in the nonrhizosphere soil (54% of the >2200 ESI-FTICR-MS identified compounds). The rhizosphere OM molecules generally had (1) greater overall molecular weights, (2) less aromaticity, (3) more carboxylate and N-containing COO functional groups, and (4) a greater hydrophilic character. These latter two OM properties typically promote metal binding. This study showed for the first time that not only the amount but also the molecular characteristics of OM in the rhizosphere may in part be responsible for the enhanced immobilization of contaminants in wetlands. These finding have implications on the stewardship and long-term management of contaminated wetlands.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Microbiologia do Solo / Áreas Alagadas / Rizosfera Tipo de estudo: Prognostic_studies País/Região como assunto: America do norte Idioma: En Ano de publicação: 2016 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Microbiologia do Solo / Áreas Alagadas / Rizosfera Tipo de estudo: Prognostic_studies País/Região como assunto: America do norte Idioma: En Ano de publicação: 2016 Tipo de documento: Article