PMID- 34273369
OWN - NLM
STAT- MEDLINE
DCOM- 20210906
LR  - 20210906
IS  - 1096-0953 (Electronic)
IS  - 0013-9351 (Linking)
VI  - 200
DP  - 2021 Sep
TI  - Integrating experiments with system-level biogeochemical modeling to understand 
      nitrogen cycling of reservoir sediments at elevated hydrostatic pressure.
PG  - 111671
LID - S0013-9351(21)00965-8 [pii]
LID - 10.1016/j.envres.2021.111671 [doi]
AB  - Impoundment of rivers to construct reservoirs for hydropower and irrigation 
      greatly increase the hydrostatic pressure acting on river sediments with 
      potential repercussions for ecosystem-level microbial activity and metabolism. 
      Understanding the functioning and responses of key biogeochemical cycles such as 
      that of nitrogen cycling to shifting hydrostatic pressure is needed to estimate 
      and predict the systemic nutrient dynamics in deep-water reservoirs. We studied 
      the functioning of bacterial communities involved in nitrogen transformation in 
      bioreactors maintained under contrasting hydrostatic pressures (0.5 MPa-3.0 MPa) 
      and complemented the experimental approach with a functional gene-informed 
      biogeochemical model. The model predictions were broadly consistent with 
      observations from the experiment, suggesting that the rates of N(2)O production 
      decreased while the sediment concentration of nitrite increased significantly 
      with increasing pressure, at least when exceeding 1.0 MPa. Changes in nitrite 
      reduction (nirS) and aerobic ammonia oxidation (amoA) genes abundances were in 
      accordance with the observed changes in N(2)O production and nitrite levels. 
      Moreover, the model predicted that the higher pressures (P > 1.5 MPa) would 
      intensify the inhibition of N(2) production via denitrification and result in an 
      accumulation of ammonia in the sediment along with a decrease in dissolved 
      oxygen. The results imply that increased hydrostatic pressure caused by dam 
      constructions may have a strong effect on microbial nitrogen conversion, and that 
      this may result in lower nitrogen removal.
CI  - Copyright (c) 2021 Elsevier Inc. All rights reserved.
FAU - Wu, Hainan
AU  - Wu H
AD  - Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake 
      of Ministry of Education, College of Environment, Hohai University, Nanjing, 
      210098, PR China.
FAU - Bertilsson, Stefan
AU  - Bertilsson S
AD  - Department of Aquatic Sciences and Assessment, Swedish University of Agricultural 
      Sciences, SE-75007, Uppsala, Sweden.
FAU - Zhang, Wenlong
AU  - Zhang W
AD  - Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake 
      of Ministry of Education, College of Environment, Hohai University, Nanjing, 
      210098, PR China.
FAU - Li, Yi
AU  - Li Y
AD  - Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake 
      of Ministry of Education, College of Environment, Hohai University, Nanjing, 
      210098, PR China. Electronic address: envly@hhu.edu.cn.
FAU - Hui, Cizhang
AU  - Hui C
AD  - Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake 
      of Ministry of Education, College of Environment, Hohai University, Nanjing, 
      210098, PR China.
FAU - Wang, Haolan
AU  - Wang H
AD  - Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake 
      of Ministry of Education, College of Environment, Hohai University, Nanjing, 
      210098, PR China.
FAU - Li, Jie
AU  - Li J
AD  - Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake 
      of Ministry of Education, College of Environment, Hohai University, Nanjing, 
      210098, PR China.
FAU - Niu, Lihua
AU  - Niu L
AD  - Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake 
      of Ministry of Education, College of Environment, Hohai University, Nanjing, 
      210098, PR China.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20210715
PL  - Netherlands
TA  - Environ Res
JT  - Environmental research
JID - 0147621
RN  - N762921K75 (Nitrogen)
SB  - IM
MH  - *Denitrification
MH  - Ecosystem
MH  - *Geologic Sediments
MH  - Hydrostatic Pressure
MH  - Nitrogen
OTO - NOTNLM
OT  - Bacterial communities
OT  - Biogeochemical model
OT  - Denitrification
OT  - Hydrostatic pressure
OT  - Nitrogen
OT  - Reservoir sediment
EDAT- 2021/07/18 06:00
MHDA- 2021/09/07 06:00
CRDT- 2021/07/17 20:10
PHST- 2021/05/16 00:00 [received]
PHST- 2021/06/18 00:00 [revised]
PHST- 2021/07/06 00:00 [accepted]
PHST- 2021/07/18 06:00 [pubmed]
PHST- 2021/09/07 06:00 [medline]
PHST- 2021/07/17 20:10 [entrez]
AID - S0013-9351(21)00965-8 [pii]
AID - 10.1016/j.envres.2021.111671 [doi]
PST - ppublish
SO  - Environ Res. 2021 Sep;200:111671. doi: 10.1016/j.envres.2021.111671. Epub 2021 
      Jul 15.