Seasonality in river export of nitrogen: A modelling approach for the Yangtze River

Chen, Xuanjing; Strokal, Maryna; Kroeze, Carolien; Ma, Lin; Shen, Zhenyao; Wu, Jie; Chen, Xinping; Shi, Xiaojun

doi:10.1016/j.scitotenv.2019.03.323

Cited by 61 publications

(60 citation statements)

References 59 publications

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“…Population growth and large-scale anthropogenic activities have increased the discharge of exogenous DON, such as chemical fertilizer, animal and human excrement, sewage, and litter amount in surface water (rivers and lakes) ( Chen et al., 2019 ; Hu et al., 2016 ). Considerable variations are expected in the amount and compositional characteristics of DON in surface water due to diverse sources.…”

Section: Introductionmentioning

confidence: 99%

Spatial variation of dissolved organic nitrogen in Wuhan surface waters: Correlation with the occurrence of disinfection byproducts during the COVID-19 pandemic

et al. 2021

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Intensified sanitization practices during the recent coronavirus disease-2019 (COVID-19) led to the release of chlorine-based disinfectants in surface water, potentially triggering the formation of disinfection byproducts (DBPs) in the presence of dissolved organic nitrogen (DON). Thus, a comprehensive investigation of DON's spatial distribution and its association with DBP occurrence in the surface water is urgently needed. In this study, a total of 51 water samples were collected from two rivers and four lakes in May 2020 in Wuhan to explore the regional variation of nitrogen (N) species, DON's compositional characteristics, and the three classes of DBP occurrence. In lakes, 53.0% to 86.3% of N existed as DON, with its concentration varying between 0.3–4.0 mg N/L. In contrast, NO 3 − -N was the dominant N species in rivers. Spectral analysis revealed that DON in the lakes contained higher humic and fulvic materials with higher A 254 , A 253 /A 203, SUVA 254 , and P III+IV /P I+II+V ratios, while rivers had higher levels of hydrophilic compounds. Trihalomethanes (THMs) were the most prevalent DBPs in the surface waters, followed by N-nitrosamines and haloacetonitriles (HANs). The levels of N-nitrosamines (23.1–97.4 ng/L) increased significantly after the outbreak of the COVID-19 pandemic. Excessive DON in the surface waters was responsible for the formation of N-nitrosamines. This study confirmed that the presence of DON in surface water could result in DBP formation, especially N-nitrosamines, when disinfectants were discharged into surface water during the COVID-19 pandemic.

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Section: Introductionmentioning

confidence: 99%

Spatial variation of dissolved organic nitrogen in Wuhan surface waters: Correlation with the occurrence of disinfection byproducts during the COVID-19 pandemic

et al. 2021

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“…Geographically separated crop and livestock production is thus an important driver of water pollution in many areas of China [3,18] . Separated crop and livestock production contributes to pollution of lakes [26,27] , groundwater [3,8,15] , rivers [28] and seas [3,11,18] . Nutrient pollution (eutrophication) leads to blooms of harmful algae.…”

Section: Separation Of Crop and Animal Production Contributes To Watementioning

confidence: 99%

Green Agriculture and Blue Water in China: Reintegrating Crop and Livestock Production for Clean Water

Strokal¹,

Janssen²,

Chen

et al. 2021

Front. Agr. Sci. Eng.

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HIGHLIGHTS • AGD aims for a green environment, sustainable agriculture and clean water. • Presenting examples of the impact of agriculture on water quality. • Presenting examples of solutions for sustainable agriculture and improved water quality. • Integration of livestock and cropping systems is possible on a farm or among farms. • Providing recommendations for further development of sustainable agriculture.

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“…Farmland fertilizer application was the most crucial source of nitrogen input in spring and autumn [27]. During 2012-2016, non-point sources contributed to 36% and 63% of the nitrogen and phosphorus flux into the sea, respectively, and its contributions tended to increase from upstream to downstream [28].…”

Section: Chemical Fertilizer Lossmentioning

confidence: 99%

Response of Eutrophication Development to Variations in Nutrients and Hydrological Regime: A Case Study in the Changjiang River (Yangtze) Basin

Tang

Han

et al. 2020

Water

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Data and literature related to water quality as well as nutrient loads were used to evaluate the Changjiang River (also Yangtze or Yangzi) Basin with respect to its hydrological regime, sediment transport, and eutrophication status. Waterbodies exhibited different eutrophic degrees following the ranking order of river < reservoir < lake. Most of the eutrophic lakes and reservoirs distributed in the upstream Sichuan Basin and Jianghan Plain are located in the middle main stream reaches. During the past decade, the water surface area proportion of moderately eutrophic lakes to total evaluated lakes continually increased from 31.3% in 2009 to 42.7% in 2018, and the trophic level of reservoirs rapidly developed from mesotrophic to slightly eutrophic. Construction and operation of numerous gates and dams changed the natural transportation rhythm of runoff, suspended solids (SS), and nutrients, and reduced flow velocity, resulting in decreased discharge runoff, slow water exchange, and decreased connectivity between rivers and lakes as well as accumulated nutrient and SS, which are the main driving forces of eutrophication. To mitigate eutrophication, jointly controlling and monitoring nutrient concentrations and flux at key sections, strengthening water quality management for irrigation backwater and aquaculture wastewater, and balancing transportation among runoff, SS, and nutrients is recommended.

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Seasonality in river export of nitrogen: A modelling approach for the Yangtze River

Cited by 61 publications

References 59 publications

Spatial variation of dissolved organic nitrogen in Wuhan surface waters: Correlation with the occurrence of disinfection byproducts during the COVID-19 pandemic

Spatial variation of dissolved organic nitrogen in Wuhan surface waters: Correlation with the occurrence of disinfection byproducts during the COVID-19 pandemic

Green Agriculture and Blue Water in China: Reintegrating Crop and Livestock Production for Clean Water

Response of Eutrophication Development to Variations in Nutrients and Hydrological Regime: A Case Study in the Changjiang River (Yangtze) Basin

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