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- Title
Groundwater Flow Process and Microbial Dynamics in a Mountainous Forested Catchment.
- Authors
Sugiyama, Ayumi; Tsujimura, Maki; Nagano, Kosuke; Nagaosa, Kazuyo; Utsumi, Motoo; Kato, Kenji
- Abstract
The groundwater contains a lot of microbes, which those communities are related to thesurrounding environment of them. However, the relationship between groundwater flowprocess and microbial community constituents and abundance has not been investigatedenough. In this study, we investigated the spatiotemporal variation of the microbial community inthe spring water and groundwater to reveal the relationship between the groundwater flowsystem and microbial communities. We performed an intensive water sampling andmonitoring in a mountainous forested catchment in Kawamata Town, Fukushima Prefecture,Japan, where basic hydrological data are available. We monitored seven piezometers and twosprings on the hillslope and the valley bottom. Throughout the sampling, monitoring andanalysis, we obtained the microbial information such as the density of prokaryotes by totaldirect counting (TDC), community constituents revealed by the next generation sequencing(NGS) method and the microbial diversity in addition to the physicochemical parameters,general water quality and mean residence time of groundwater using sulfur-hexafluoride(SF6). The mean residence time of the spring water and groundwater ranged from less than1 year to 30 years. The density of prokaryotes ranged from 5.37 x 103 cells/mLto 2.01 x 106 cells/mL (n=60). The most abundant prokaryotes shown by NGSwere Proteobacteria or Acidobacteria, suggesting that the environment surroundingthose microbes was aerobic subsurface. The analysis of the diversity shows that thespecies richness is the highest in the spring water, and analysis of the communitysimilarity suggests that the communities relate with the groundwater table fluctuation.Thus, these show that the environmental microbial dynamics in the groundwaterreflect not only the surrounding environment but also the groundwater flow itself.
- Subjects
FUKUSHIMA-ken (Japan); JAPAN; GROUNDWATER flow; WATER table; WATER quality; WATER springs; MICROBIAL communities
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article