Warming increases nutrient mobilization and gaseous nitrogen removal from sediments across cascade reservoirs

Zhou, Xingpeng; Chen, Nengwang; Yan, Zhen; Duan, Shuiwang

doi:10.1016/j.envpol.2016.05.060

Cited by 43 publications

(14 citation statements)

References 69 publications

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“…The kinetics of ammonium with S1 incubation at different sediment-to-water ratios in sample water are shown in Figure 4 and those of the S1–S4 incubation in sample water are shown in Figure 5. Sediments can act as source or sink in the aquatic ecosystem cycle and are important in regulating the ammonium balance [30]. The intrinsic contributions from sediments to aqueous ammonium in the sample water–sediment incubation system (Cssw, t′) were calculated using Equation (2) and are shown in Figures S4 and S5:Cssw, t′ = Cssw, t − Csw, t where Cssw, t (mg·L −1 ) is the ammonium concentration with time in the sample water–sediment incubation.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Internal Ammonium Loading from Long-Term Polluted Sediments by Rural Domestic Wastewater

Luo

et al. 2019

IJERPH

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Given long-term decentralized and centralized rural domestic wastewater (RDW) discharge, nitrogen is continuously depositing in sediments. RDW discharge is assumed to be an important source of ammonium in surface water; however, the effect of long-term RDW discharge on nitrogen pollution in sediments remains unknown. Batch incubations were conducted to investigate the characteristics of internal ammonium loading from long-term polluted sediments by RDW discharge. Four sediments were demonstrated to be heavily polluted by long-term RDW discharge, with total nitrogen (TN) values of 5350, 8080, 2730, and 2000 mg·kg−1, respectively. The internal ammonium release from sediment was a slow and long process, and the risk of ammonium release from sediment during the dry season was significantly greater than that during the wet season. Though all selected sediments were heavily polluted by long-term RDW discharge, the relative contribution of internal ammonium loading from sediments was generally lower than that of external pollution. Hence, dredging is not suggested for RDW-polluted sediments except in response to an emergency. The excessive ammonium in the selected catchment was mainly from untreated and centralized black water in RDW. Centralized black waters in rural communities are highlighted to be separately treated or reused to maintain ammonium content at a safe level.

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Section: Resultsmentioning

confidence: 99%

Characteristics of Internal Ammonium Loading from Long-Term Polluted Sediments by Rural Domestic Wastewater

Luo

et al. 2019

IJERPH

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“…The wetland soil surface is submerged for 7 h over a 24 h cycle. The catchment areas of the Min River and Jiulong River are 60,092 and 14,741 km 2 , respectively, with annual discharge of 58.6×10 9 and 12.4×10 9 m 3 y -1 , respectively (Zhou et al 2016). The mean salinity of tidal water at MRE is 5.1±2.6‰, which is significantly lower than that in JRE (23.6±3.2‰).…”

Section: Study Sitesmentioning

confidence: 89%

Production and uptake of dissolved carbon, nitrogen, and phosphorus in overlying water of aquaculture shrimp ponds in subtropical estuaries, China

Yang

Lai

et al. 2019

Environ Sci Pollut Res

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Water quality deterioration can adversely affect the long-term sustainability of aquaculture industry. Understanding the processes of nutrient regeneration and uptake is important for improving water quality and the overall ecosystem health of aquaculture systems. In spite of the importance of dissolved nutrients (DOC, DIC, N-NOx − , N-NH4 + , and P-PO4 3−) in governing water quality and ecosystem functioning, the spatiotemporal variations in the production and uptake of dissolved nutrients in aquaculture ponds is still poorly understood. In this study, the nutrient production and uptake rates in the overlying water were quantified among different shrimp growth stages in the aquaculture ponds in the Min River Estuary (MRE) and Jiulong River Estuary (JRE), southeast China. Significant differences in the nutrient production and uptake rates in the overlying water were observed among the three growth stages and two estuaries. The temporal variations of DOC and DIC production rates in both estuarine ponds closely followed the seasonal cycle of temperature, while the difference in DOC and DIC production rates between the two estuaries was likely caused by differences in water salinity. The changes in the production and uptake rates of dissolved inorganic nitrogen (N-NOx − and N-NH4 +) and P-PO4 3in the water column over time were partly related to the interactions between thermal conditions and phytoplankton biomass (e.g., chlorophyll a concentrations) in the ponds. Our results demonstrate the complex dynamics and environmental risk of dissolved nutrients in subtropical shrimp ponds, and call for a more effective management of nutrient-laden wastewater in safeguarding the long-term sustainability of aquaculture production. Keywords Nutrients • Uptake • Production • Overlying water • Aquaculture pond • Subtropical estuary Nomenclature table Nomenclature Abbreviations Nomenclature Abbreviations Min River Estuary MRE DOC production rates in the overlying water DOC_prod Jiulong River Estuary JRE DIC production rates in the overlying water DIC_prod Litopenaeus vannamei L. vannamei Dissolved organic carbon DOC Metric tons Mt Dissolved inorganic carbon DIC Nitrite N-NO2-Chlorophyll a Chl-a Nitrate N-NO3-Dissolved oxygen DO Ammonium N-NH4 + Dissolved organic matter DOM

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“…JRE has a subtropical oceanic climate, with mean annual air temperature and rainfall of approximately 21.0 °C and 1,371 mm, respectively (Wang et al, ). The tides in the two estuaries are semidiurnal, with a mean tidal range of 4.0–4.5 m. The catchment area and mean annual discharge of MRE are 60,092 km 2 and 58.6 × 10 9 m 3 , respectively, while those of JRE are 14,741 km 2 and 12.4 × 10 9 m 3 /year, respectively (Zhou et al, ).…”

Section: Methodsmentioning

confidence: 99%

Methane Dynamics of Aquaculture Shrimp Ponds in Two Subtropical Estuaries, Southeast China: Dissolved Concentration, Net Sediment Release, and Water Oxidation

et al. 2019

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Aquaculture ponds are potentially large sources of atmospheric methane (CH4) that can exacerbate climate change. A thorough understanding of various CH4 biogeochemical processes occurring in the ponds is essential for the prediction and management of CH4 emissions arising from aquaculture. However, the variations in pond CH4 biogeochemical processes among estuaries and aquaculture stages remain poorly understood. In this study, we assessed the net sediment release, oxidation, and dissolved concentrations of CH4 in aquaculture ponds in two subtropical estuaries among three shrimp growth stages in Southeast China. Overall, porewater CH4 concentrations and sediment CH4 release rates varied greatly among different stages in the order: middle stage > final stage > initial stage. Water column CH4 concentrations and overlying water CH4 oxidation rates showed an increasing trend over the study period. Sediment CH4 release rates and dissolved CH4 concentrations also varied considerably between the two estuaries. In the more saline Jiulong River Estuary, sediment CH4 release rate was lower while the shrimp survival rate and yield were higher as compared to the Min River Estuary with a lower water salinity. Our results suggest that both high water salinity and feed utilization efficiency can effectively mitigate CH4 emissions from the coastal shrimp ponds. Overall, the large magnitude of net CH4 emissions observed in our shrimp ponds highlights the urgency of formulating appropriate policies and building sustainable institutions that can strike a balance between land‐based aquaculture development and greenhouse gas mitigation in the subtropical coastal regions.

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Warming increases nutrient mobilization and gaseous nitrogen removal from sediments across cascade reservoirs

Cited by 43 publications

References 69 publications

Characteristics of Internal Ammonium Loading from Long-Term Polluted Sediments by Rural Domestic Wastewater

Characteristics of Internal Ammonium Loading from Long-Term Polluted Sediments by Rural Domestic Wastewater

Production and uptake of dissolved carbon, nitrogen, and phosphorus in overlying water of aquaculture shrimp ponds in subtropical estuaries, China

Methane Dynamics of Aquaculture Shrimp Ponds in Two Subtropical Estuaries, Southeast China: Dissolved Concentration, Net Sediment Release, and Water Oxidation

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