Long-term variations of TN and TP in four lakes fed by Yangtze River at various timescales

Ji, Huang; Wang, Xixi; Xi, Beidou; Xu, Qing; Tang, Yuchen; Jia, Keli; Huo, Shouliang; An, Da; Gao, Rutai; Liu, Hongliang; Xiao-guang, LI; Liu, Minmin; Mao, Jingying

doi:10.1007/s12665-015-4714-y

Cited by 10 publications

(6 citation statements)

References 70 publications

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“…However, lentic nutrient retention does not always occur, particularly in forested and smaller agricultural systems (Huang et al, 2015;Powers et al, 2014;Powers et al, 2015). Even after external sources of nutrients are reduced to a reservoir, N and P stored in lakebed sediments can internally load the water column, preventing any improvement in water quality and potentially triggering algal blooms (Granéli, 1999;Scharf, 1999).…”

Section: Introductionmentioning

confidence: 99%

Sediments in Agricultural Reservoirs Act as Sinks and Sources for Nutrients over Various Timescales

Shaughnessy

Sloan

Corcoran

et al. 2019

Water Resources Research

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Reservoirs along rivers have the potential to act as nutrient sinks (e.g., denitrification and sedimentation) or sources (e.g., decomposition and redox changes), potentially reducing or enhancing nutrient loads downstream. This study investigated the spatial and temporal variability of water and lakebed sediment chemistry for an agricultural reservoir, Carlyle Lake (Illinois, U.S.), to assess the role of sediments as nutrient sinks or sources. Samples were collected across the reservoir over a 2‐year period. We measured N‐ and P‐species in water at the sediment‐water interface, in sediment porewaters, and loosely bound to sediment exchange sites. Total N, total P, total C, organic matter, Fe, Mn, and grain size were measured in bulk sediments. We observed a strong gradient in sedimentary total N, total P, total C, organic matter, and metals along the reservoir, with the lowest concentrations at the river mouth and the highest concentrations near the dam. Additionally, we did a long‐term nutrient mass balance using historical water quality data for streams entering and exiting the reservoir and the reservoir itself. Mass balance calculations showed that Carlyle Lake, on average, removed 2,738 Mg N/year and released 121 Mg P/year over the multidecadal observation period. While N was consistently removed from the system over time, P was initially stored in, but later released from, the reservoir. The subsequent release of legacy P from the reservoir led to higher outgoing, compared with incoming, P loads. Thus, reservoirs in intensively managed landscapes can act as sinks for N but sources for P over decadal timescales.

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Section: Introductionmentioning

confidence: 99%

Sediments in Agricultural Reservoirs Act as Sinks and Sources for Nutrients over Various Timescales

Shaughnessy

Sloan

Corcoran

et al. 2019

Water Resources Research

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“…The second aquifer is a confined aquifer dominated by fine-medium sand, locally interlaced with gravel, and has a thickness of 50-150 m (Sun et al, 2020;Wang, 2015). The third aquifer is also a confined aquifer and is mainly composed of gravel and coarse sand, with a thickness of 50-100 m (HGSI, 2016).…”

Section: Site Descriptionmentioning

confidence: 99%

“…The current water resource and ecological statuses of the EDL are poor relative to historical conditions due to a deterioration in water quality, ecological degradation, and a decline in species diversity as a result of lake shrinkage and wetland degradation (Huang et al, 2018;Wang et al, 2015;Wang et al, 2015;Hu et al, 2015). The ecological sensitivity and important ecological role of the EDL emphasize the need for an evaluation of LGD and associated nutrients input.…”

mentioning

confidence: 99%

Contrasting lacustrine groundwater discharge and associated nutrient loads in different geological conditions

Sun

Deng

et al. 2021

Preprint

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Abstract. The spatial patterns of lacustrine groundwater discharge (LGD) and associated nutrients input is crucial for effective management and protection of lakes. Multiple factors have been found to influence the spatial differences in LGD rates and associated nutrients loads, but the influence of geological conditions on the differences have not been well understood. In this study, we quantified LGD rates and associated nutrients loads in two sides with contrasting geological conditions of East Dongting Lake (EDL) within central Yangtze catchment and discuss the influence of geology on the spatial differences, through 222Rn mass-balance model, water chemistry coupled with existing geological data. The results showed that LGD rates were 38.66 ± 21.07 mm d−1 in the east EDL which is characterized by hilly geomorphy, deep/fast/narrow flowing, coarse-grained lakebed and large hydraulic gradients (0.004–0.006). Surprisingly, LGD rates were higher (92.82 ± 51.98 mm d−1) in the west EDL which is characterized by alluvial-lacustrine plain geomorphology, shallow/sluggish flowing, clayey or silty lakebed and low hydraulic gradients (0.0002–0.0015). The remaining factor determining the higher LGD rates in the west EDL is the permeability of the porous aquifer connected with the lake, which could be enlarged by some preferential pathways including large-scale buried paleo-channel and small-scale plant roots. The groundwater around the east EDL existed in a less confined environment, and frequent flushing led to low concentrations of nutrients. On the contrast, rapid burial of sediments and deposition of paleo-lake sediments since Last Deglaciation formed an organic-rich and reducing environment, which facilitated the enrichment of geogenic nutrients. As a result, the loads of LGD-derived nutrients in the west generally exceeded that in the east by one order of magnitude. In practice, future water resource management and ecological protection of Dongting Lake should focus on groundwater discharge in west EDL. This study highlights an important role of geological conditions in determining contrasting LGD rates and associated nutrients loads in large freshwater lakes.

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“…The average TP concentrations in the river sections of JJ and AQ were up to the standard class III, and the average TP concentrations in other urban river sections were class IV, with TP concentration analysis referring to the environmental quality standards for surface water (GB 3838-2002). Overall, as a result of intensive human activities and developed economies, water pollution affected the ecological environment of the middle and lower reaches of the Yangtze River [16,17]. Phosphorus mainly exists in the particle state in surface water [2], and PP is the main existing form of phosphorus in river systems and estuarine areas [18].…”

Section: Distribution Of Tp Pp and Percent Of Pp To Tpmentioning

confidence: 99%

Distribution Characteristics and Spatial Differences of Phosphorus in the Main Stream of the Urban River Stretches of the Middle and Lower Reaches of the Yangtze River

Dong

Lin

Tang

et al. 2020

Water

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Excessive phosphorus is the main problem of water pollution in the main stream of the Yangtze River, while it is not clear about the distribution characteristics and spatial differences of phosphorus in the urban river stretches of the middle and lower reaches of the Yangtze River. In this study, a field survey in June 2014 revealed that the average particulate phosphorus (PP) concentration ranged from 0.195 mg/L to 0.105 mg/L from Wuhan (WH) in the middle reaches of the Yangtze River to Shanghai (SH, 1081 km from WH) in the lower reaches of the Yangtze River, and the average PP-to-the total phosphorus (TP) ratio decreased from 85.71% in WH to 45.65% in SH, while the average soluble reactive phosphate (SRP) concentration ranged from 0.033 to 0.125 mg/L, and the average SRP-to-total dissolved phosphorus (TDP) ratio increased from 60.73% in WH to 88.28% in SH. In general, PP was still an important form of TP in the middle and lower reaches of the Yangtze River. The concentrations of PP and SRP at different sampling locations and water depths in the same monitoring section showed differences, which might be related to the transportation and sedimentation of suspended sediment (SS) and differences in the location of urban sewage outlets. Historical data showed that the concentration and particle size of the SS decreased over time, while the discharge of wastewater also increased over time in the Yangtze River Basin. The measured results showed that there was a significant positive correlation between SS and PP. As a result, the concentration of SRP might increase in the middle and lower reaches of the Yangtze River. If the SRP concentration is not properly controlled, the degree of eutrophication of water body could significantly increase in the Yangtze River estuary, the riparian zone of the urban river stretches, the tributary slow-flow section, and the corresponding lakes connected with the Yangtze River.

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Long-term variations of TN and TP in four lakes fed by Yangtze River at various timescales

Cited by 10 publications

References 70 publications

Sediments in Agricultural Reservoirs Act as Sinks and Sources for Nutrients over Various Timescales

Sediments in Agricultural Reservoirs Act as Sinks and Sources for Nutrients over Various Timescales

Contrasting lacustrine groundwater discharge and associated nutrient loads in different geological conditions

Distribution Characteristics and Spatial Differences of Phosphorus in the Main Stream of the Urban River Stretches of the Middle and Lower Reaches of the Yangtze River

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