Effects of Hydrostatic Pressure on the Nitrogen
Cycle of Sediment

Chai, Bei-Bei; Zhao, Xiaoguang; Li, Yajiao

doi:10.15244/pjoes/64080

Cited by 1 publication

(2 citation statements)

References 32 publications

(44 reference statements)

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“…The DIN concentration dramatically increased from an average of 37 µmol L − 1 in the 1980s to 120 µmol L − 1 in the 2000s (Dai et al, 2011). The reservoir operation has implications not only for N transport but also for N transformation in the TGR (Chai et al, 2016;Shi et al, 2020;Wang, 2020). For example, frequent arti cial oods created by the reservoir operation can reduce the ability of soil to retain nutrients and promote the release of N in sediments via coupled nitri cation-denitri cation processes (Ye et al, 2019;Yu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the spatiotemporal variations in N and their relationship with environmental factors should be studied to assess the water quality status and impact of TGR operation, especially when the hydrology regime has undergone tremendous changes since TGR impoundment. The in uencing mechanisms of the changing hydrological regime on N cycling in the TGR have been revealed through laboratory experiments by arti cially increasing hydrostatic pressure, creating an anti-seasonal wet-dry cycle, and prolonging water residence time (Chai et al, 2016;Shi et al, 2020;Yu et al, 2020). However, most studies have preferred short-term investigation because of di culties in obtaining long-term observed data (Ding et al, 2019;Huang et al, 2014;Luo et al, 2011;Ran et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Long-term impacts of reservoir operation on the spatiotemporal variation in nitrogen forms in the post-Three Gorges Dam period (2004–2016)

Nie

Chen

Niu

et al. 2021

Environ Sci Pollut Res

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Nitrogen (N) is an essential nutrient limiting life, and its biochemical cycling and distribution in rivers have been markedly affected by river engineering construction and operation. Here, we comprehensively analyzed the spatiotemporal variations and driving environmental factors of N distributions based on the long-term observations (from 2004 to 2016) of seven stations in the Three Gorges Reservoir (TGR). In the study period, the overall water quality status of the river reach improved, whereas N pollution was severe and tended to be aggravated after the TGR impoundment. The anti-seasonal reservoir operation strongly affected the variations in N forms. The total nitrogen (TN) concentration in the mainstream of the Yangtze River continuously increased, although it was still lower than that in the incoming tributaries (Wu and Jialing rivers). Further analysis showed that this increase occurred probably because of external inputs, including the upstream (76%), non-point (22%), and point source pollution inputs (2%). Besides, different N forms showed signi cant seasonal variations; among them, the TN and nitrate nitrogen concentrations were the lowest in the impoundment season (October-February), and the ammonia nitrogen concentrations were the highest in the sluicing season (March-May). These parameters varied likely because of internal N transformation. Redundancy analysis revealed that the water level regulated by the anti-seasonal operation was the largest contributor. Our ndings could provide a basis for managing and predicting the water quality in the Yangtze River.

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