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- Title
Spatial and temporal variation of residence time and microbe in spring and groundwater at headwater catchments.
- Authors
Tsujimura, Maki; Yamamoto, Chisato; Imaizumi, Yuki; Sakakibara, Koichi; Sugiyama, Ayumi; Nagano, Kosuke; Kato, Kenji; Onda, Yuichi
- Abstract
A variety of microbes are included in the spring water and the groundwater, and those vary intime and space, suggesting that information of microbe could be used as a tracer forgroundwater flow system. However, there have not been enough studies to investigate thespatio-temporal dynamics of microbe in the groundwater. We focused on mountain hillslopeand a headwater catchment where the hydrological data is available, and monitored theresidence time, chemical characteristics, density of prokaryotes and microbial communitycomposition in the spring water and the groundwater on the ridge, the hillslope and the valleybottom with the hydrometric and the groundwater data. We sampled the spring water and thegroundwater with total number of 57 from October 2015 through August 2017 atMt. Fuji area, Shizuoka prefecture and Mt. Setohachi area, Fukushima prefecture,Japan. The density of prokaryotes in the spring water and the groundwater ranges from 102 to103 cells/mL in Mt. Fuji area, and from 103 to 105 cells/mL in Mt. Setohachi area.Specifically, the water with SF6 age younger than 20 years tends to show a wide range ofdensity of prokaryotes ranging from 103 to 106 cells/mL, whereas the water with the ageolder than 20 years tends to show a low density of prokaryotes in the order of 103cells/mL.This suggests that the older groundwater includes smaller amount of prokaryotes ascompared with the younger groundwater. The diversity of microbial community composition in the spring and the groundwater ishigher on the ridge than that on the hillslope and the valley bottom, suggesting the diversityof microbial community composition becomes low along with groundwater flow from therecharge area to the discharge area. Additionally, the microbial community composition inthe groundwater on the ridge shows a clear seasonal change, whereas that on the hillslope andthe valley does not show change among the seasons. The microbial community compositionin the groundwater seems to become stable and homogeneous in the discharge area ascompared with that of the recharge area. This shows that the groundwater flow process alsoeffects on the spatio-temporal variation of the microbial community composition in thegroundwater.
- Subjects
FUJI, Mount (Japan); GROUNDWATER; SPATIAL variation; GROUNDWATER flow; WATER springs; SPATIO-temporal variation; AQUIFERS; HYDROGEOLOGY
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article