Are dominant microbial sub-surface communities affected by water quality and soil characteristics?

Maria del Carme Barba Ferrer, Albert Folch Sancho, Xavier Sanchez Vila, Maira Martínez-Alonso, Núria Gaju

Research output: Contribution to journalArticleResearch

9 Citations (Scopus)

Abstract

© 2019 Elsevier Ltd Subsurface microorganisms must deal with quite extreme environmental conditions. The lack of light, oxygen, and potentially nutrients are the main environmental stresses faced by subsurface microbial communities. Likewise, environmental disruptions providing an unbalanced positive input of nutrients force microorganisms to adapt to varying conditions, visible in the changes in microbial community diversity. In order to test microbial community adaptation to environmental changes, we performed a study in a surface Managed Aquifer Recharge facility, consisting of a settlement basin (two-day residence time) and an infiltration pond. Data on groundwater hydrochemistry, soil texture, and microbial characterization was compiled from surface water, groundwater, and soil samples at two distinct recharge operation conditions. Multivariate statistics by means of Principal Component Analysis (PCA) was the technique used to map the relevant dimensionality reduced combinations of input variables that properly describe the system behavior. The methodology selected allows including variables of different nature and displaying very different range values. Strong differences in the microbial assemblage under recharge conditions were found, coupled to hydrochemistry and grain-size distribution variables. Also, some microbial groups displayed correlations with either carbon or nitrogen cycles, especially showing abundant populations of denitrifying bacteria in groundwater. A significant correlation was found between Methylotenera mobilis and the concentrations of NO 3 and SO 4 , and also between Vogesella indigofera and the presence of DOC in the infiltrating water. Also, microbial communities present at the bottom of the pond correlated with representative descriptors of soil grain size distribution.
Original languageEnglish
Pages (from-to)332-343
Number of pages12
JournalJournal of Environmental Management
Volume237
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Grain-size distribution
  • Groundwater
  • Managed aquifer recharge
  • Principal component analysis
  • Soil aquifer treatment
  • Microbiota
  • Soil
  • Bacteria
  • Water Quality
  • BACTERIAL COMMUNITY
  • ARTIFICIAL RECHARGE
  • TEMPORAL-CHANGES
  • GROUNDWATER RECHARGE
  • INFILTRATION
  • IMPACT
  • MANAGED AQUIFER RECHARGE
  • REDOX CONDITIONS
  • TRACE ORGANIC-CHEMICALS
  • DIVERSITY

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