Sources and behaviour of nitrogen compounds in the shallow groundwater of agricultural areas (Poyang Lake basin, China)

Soldatova, Evgeniya; Гусева, Наталья Владимировна; Sun, Zhifu; Bychinsky, V. A.; Boeckx, Pascal; Gao, Bai

doi:10.1016/j.jconhyd.2017.05.002

Cited by 60 publications

(16 citation statements)

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“…Thus, future work for managers and ecologists studying Poyang Lake should consider the contribution of baseflow to the quality of river and lake water, because 44% to 79% of the streamflow is derived from baseflow (Figures and ) through many subsurface flow paths. Additionally, further work needs to focus on the most downstream plain areas with shallow groundwater flow adjacent to Poyang Lake (Li et al, ; Li, Zhao, et al, ; Soldatova et al, ). The primary need is to investigate the direct contribution of baseflow to this lake system and its floodplain wetland (~3,000‐km 2 buffering capacity).…”

Section: Resultsmentioning

confidence: 99%

“…The catchment rivers are vital part of water supply in the southern China and the Yangtze River basin. They sustain communities and economies by providing water for municipal, industrial, agricultural, and hydroelectric uses (Soldatova, Guseva, Sun, Bychinsky, & Boeckx, ; S. Wang, ). Although surface water flow is often sustained by groundwater discharge to rivers, previous management of water resources in the Poyang Lake catchment focused largely on surface water (Shankman et al, ).…”

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Historical and predicted variations of baseflow in China's Poyang Lake catchment

Zhang

2018

River Research & Apps

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Baseflow availability and its contribution to streamflow are critical for planning and management of catchment hydrology and ecology. This study uses a digital filtering technique, statistical methods, and hydrological projection to investigate historical and future baseflow characteristics with respect to climate and land use impacts, exemplified by the large Poyang Lake catchment (China). Digital filtering results show that annual baseflow varied between 25 × 108 and 820 × 108 m3/year for the catchment rivers during 1953–2014. The results reveal that on average 62% of the long‐term streamflow in the catchment is derived from baseflow contribution. Statistics show a generally increasing trend in the annual baseflow and baseflow index (BFI) for most of the rivers over the past 60 years, with the major frequencies varying between 5 and 20 years. Although the trends in baseflow and BFI are attributable to the combined effects of climate and land use change across the catchment, baseflow variations are expected to be more sensitive to climate than land use changes. In general, precipitation plays a dominant role in controlling baseflow and can be used as an indication of the variations in baseflow at the subcatchment scale. Hydrological projection shows that annual baseflow and BFI are likely to increase by up to 31% and 13% during 2018–2035, respectively, based on historical baseflow trends. Our results indicate that management approaches for the catchment that consider groundwater and surface water as a joint resource will be needed to effectively manage the current and future river regime, its water resources, and water quality.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Historical and predicted variations of baseflow in China's Poyang Lake catchment

Zhang

2018

River Research & Apps

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“…The impact of nitrogen sources on groundwater have been investigated in a number of studies. Different sources of nitrogen and their contribution to the nitrate content in the groundwater have been analyzed [20][21][22][23][24]. The research on the role of land use [25], vulnerability of groundwater [26,27], processes of leaching [28], and the migration and transformation of nitrogen in groundwater [29][30][31] have furthered the knowledge on factors controlling groundwater nitrate contamination and its mitigation.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Mass Balance and Pressure Impact Model Applied to an Urban Aquifer

Janža

Prestor

Pestotnik

et al. 2020

Water

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The assurance of drinking water supply is one of the biggest emerging global challenges, especially in urban areas. In this respect, groundwater and its management in the urban environment are gaining importance. This paper presents the modeling of nitrogen load from the leaky sewer system and from agriculture and the impact of this pressure on the groundwater quality (nitrate concentration) in the urban aquifer located beneath the City of Ljubljana. The estimated total nitrogen load in the model area of 58 km2 is 334 ton/year, 38% arising from the leaky sewer system and 62% from agriculture. This load was used as input into the groundwater solute transport model to simulate the distribution of nitrate concentration in the aquifer. The modeled nitrate concentrations at the observation locations were found to be on average slightly lower (2.7 mg/L) than observed, and in general reflected the observed contamination pattern. The ability of the presented model to relate and quantify the impact of pressures from different contamination sources on groundwater quality can be beneficially used for the planning and optimization of groundwater management measures for the improvement of groundwater quality.

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“…Understanding the taxonomic and functional compositions of microbial communities is essential to elucidating the responses of natural bacterial communities to environmental perturbations, such as hydrological fluctuations and nutrient pollution 9-11 . Poyang Lake (PYL) is a seasonal lake characterized by recurrent wet-dry phases [12][13][14] . Precipitation, evaporation, catchment inflows, and the Three Gorges Dam control the hydrological processes of PYL by regulating its water level 15 , which plays a crucial role in determining hydrodynamic processes 16 .…”

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Microbial community structure and functional properties in permanently and seasonally flooded areas in Poyang Lake

Liu

Ren

et al. 2020

Sci Rep

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Water level fluctuations are an inherent feature regulating the ecological structures and functions of lakes. It is vital to understand the effects of water level fluctuations on bacterial communities and metabolic characteristics in freshwater lakes in a changing world. However, information on the microbial community structure and functional properties in permanently and seasonally flooded areas are lacking. Poyang Lake is a typical seasonal lake linked to the Yangtze River and is significantly affected by water level fluctuations. Bottom water was collected from 12 sampling sites: seven inundated for the whole year (inundated areas) and five drained during the dry season (emerged areas). High-throughput 16S rRNA gene sequencing was used to identify the bacterial communities. The results showed that the taxonomic structure and potential functions of the bacterial communities were significantly different between the inundated and emerged areas. Cyanobacteria was dominant in both areas, but the relative abundance of Cyanobacteria was much higher in the emerged areas than in the inundated areas. Bacterial communities were taxonomically sensitive in the inundated areas and functionally sensitive in the emerged areas. Nitrogen, phosphorus, and dissolved organic carbon concentrations and their ratios, as well as dissolved oxygen, played important roles in promoting the bacterial taxonomic and functional compositional patterns in both areas. According to the metabolic predictions based on 16S rRNA gene sequences, the relative abundance of functional genes related to assimilatory nitrate reduction in the emerged areas was higher than in the inundated areas, and the relative abundance of functional genes related to dissimilatory nitrate reduction in the inundated areas was higher. These differences might have been caused by the nitrogen differences between the permanently and seasonally flooded areas caused by intra-annual water level fluctuations. The relative abundance of functional genes associated with denitrification was not significantly different in the inundated and emerged areas. This study improved our knowledge of bacterial community structure and nitrogen metabolic processes in permanently and seasonally flooded areas caused by water level fluctuations in a seasonal lake.Microbial assemblages are fundamental components of aquatic ecosystems and play important roles in driving global energy fluxes and biogeochemical cycling 1 . Microbial communities have high species diversity and genetic diversity 2-5 , which make them sensitive to environmental perturbations 6,7 . The relative balance of external nutrient loading influences microbial functional genes and associated metabolic processes in lake ecosystems 8 . Understanding the taxonomic and functional compositions of microbial communities is essential to elucidating the responses of natural bacterial communities to environmental perturbations, such as hydrological fluctuations and nutrient pollution 9-11 . Poyang Lake (PYL) is a seasonal lake characterized by ...

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Sources and behaviour of nitrogen compounds in the shallow groundwater of agricultural areas (Poyang Lake basin, China)

Cited by 60 publications

References 65 publications

Historical and predicted variations of baseflow in China's Poyang Lake catchment

Historical and predicted variations of baseflow in China's Poyang Lake catchment

Nitrogen Mass Balance and Pressure Impact Model Applied to an Urban Aquifer

Microbial community structure and functional properties in permanently and seasonally flooded areas in Poyang Lake

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