Anthropogenic point-source and non-point-source nitrogen inputs into  Huai River basin and their impacts on riverine ammonia–nitrogen flux

Zhang, Wangshou; Swaney, Dennis P.; Li, X. Y.; Hong, Bongghi; Howarth, Robert W.; Ding, Shijie

doi:10.5194/bg-12-4275-2015

Cited by 48 publications

(23 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Descriptive statistics showing the ranges of parameters and their significance is shown in Table below. A more detailed discussion of the methodology can be found in the supporting information (Cavanaugh, ; Kass & Raftery, ; Sinha & Michalak, ; Zhang, Swaney, Li, et al, ). Predicted and monitored TP fluxes were compared using the paired t test.…”

Section: Methodsmentioning

confidence: 99%

Anthropogenic Phosphorus Inputs to a River Basin and Their Impacts on Phosphorus Fluxes Along Its Upstream‐Downstream Continuum

et al. 2017

Self Cite

View full text Add to dashboard Cite

The increasing trend in riverine phosphorus (P) loads resulting from anthropogenic inputs has gained wide attention because of the well‐known role of P in eutrophication. So far, however, there is still limited scientific understanding of anthropogenic P inputs and their impacts on riverine flux in river reaches along the upstream‐to‐downstream continuum. Here we investigated P budgets in a series of nested watersheds draining into Hongze Lake of China and developed an empirical function to describe the relationship between anthropogenic inputs and riverine P fluxes. Our results indicated that there are obvious gradients regarding P budgets in response to changes in human activities. Fertilizer application and food and feed P import was always the dominant source of P inputs in all sections, followed by nonfood P. Further interpretation using the model revealed the processes of P loading to the lake. About 2%–9% of anthropogenic P inputs are transported from the various sections into the corresponding tributaries of the river systems, depending upon local precipitation rates. Of this amount, around 41%–95% is delivered to the main stem of the Huai River after in‐stream attenuation in its tributaries. Ultimately, 55%–86% of the P loads delivered to different locations of the main stem are transported into the receiving lake of the downstream, due to additional losses in the main stem. An integrated P management strategy that considers the gradients of P loss along the upstream‐to‐downstream continuum is required to assess and optimize P management to protect the region's freshwater resource.

show abstract

Section: Methodsmentioning

confidence: 99%

Anthropogenic Phosphorus Inputs to a River Basin and Their Impacts on Phosphorus Fluxes Along Its Upstream‐Downstream Continuum

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous studies have examined only a limited number of physicochemical parameters and therefore do not provide enough information for an overall assessment of the distribution of microbiota and ARGs in urban river systems. Severe anthropogenic pollution in urban rivers can strongly affect aquatic environments and directly influence riverine microbiota (Jordaan and Bezuidenhout 2016;Zhang et al 2015). Any shift in bacterial communities will further impact the nitrogen and carbon cycles and that in turn will affect microbiota (Hale et al 2015;Ibekwe et al 2016).…”

Section: Responsible Editor: Robert Duranmentioning

confidence: 99%

Antibiotic resistance genes in an urban river as impacted by bacterial community and physicochemical parameters

Zhou

Zheng

Wei

et al. 2017

Environ Sci Pollut Res

144

View full text Add to dashboard Cite

Antibiotic resistance genes (ARGs) in urban rivers are a serious public health concern in regions with poorly planned, rapid development. To gain insights into the predominant factors affecting the fate of ARGs in a highly polluted urban river in eastern China, a total of 285 ARGs, microbial communities, and 20 physicochemical parameters were analyzed for 17 sites. A total of 258 unique ARGs were detected using high-throughput qPCR, and the absolute abundance of total ARGs was positively correlated with total organic carbon and total dissolved nitrogen concentrations (P < 0.01). ARG abundance and diversity were greatly altered by microbial community structure. Variation partitioning analysis showed that the combined effects of multiple factors contributed to the profile and dissemination of ARGs, and variation of microbial communities was the major factor affecting the distribution of ARGs. The disparate distribution of some bacteria, including Bacteroides from mammalian gastrointestinal flora, Burkholderia from zoonotic infectious diseases, and Zoogloea from wastewater treatment, indicates that the urban river was strongly influenced by point-source pollution. Results imply that microbial community shifts caused by changes in water quality may lead to the spread of ARGs, and point-source pollution in urban rivers requires greater attention to control the transfer of ARGs between environmental bacteria and pathogens.

show abstract

“…Hence, both animal refuse and chemical fertilizers were also potential sources of the C and nutrients within this zone. Input from human settlements (Zhang et al , ) can also not be discounted. Instream production (Hood et al ., ; Kunz et al ., ; Medeiros and Arthington, ) might also have contributed significantly because the channel length from catchment to sub‐basin outlet was quite long (> 16 000 m) with numerous meandering points which provided sites for potentially high biotic activities.…”

Section: Discussionmentioning

confidence: 99%

Changes in carbon and nutrient fluxes from headwaters to ocean in a mountainous temperate to subtropical basin

Mutema

Chivenge

Nivet

et al. 2017

Earth Surf Processes Landf

View full text Add to dashboard Cite

Water erosion provides major links in global cycles of carbon (C), nitrogen (N) and phosphorus (P). Although significant research on erosion mechanisms has been done, there is still little knowledge on C, N and P fluxes across landscapes to the ocean and their controlling factors in subtropical climates. A four-year study quantifying and comparing particulate and dissolved C, N and P from multiple scales (microplot, plot, microcatchment, subcatchment, catchment, sub-basin and basin) was performed in Thukela basin (≈30 000 km 2 ), South Africa. The basin climate was largely subtropical-humid [mean annual precipitation (MAP) > 980 mm yr -1 ], but temperate (MAP >2000 mm yr -1 ) on the highlands. Open grassland, cropland and bushland were the major land uses. On average, 65, 24 and 4 g m -2 yr -1 C, N and P were displaced from original topsoil positions, but only 0.33, 0.005 and 0.002 mg m -2 yr -1 were, respectively, exported to the ocean. The fluxes decreased by 95, 97 and 84%, respectively, from plot to microcatchment outlet; and decreased further in downstream direction by >99% from microcatchment to basin outlet. The hillslope (microplot to microcatchment) fluxes correlated strongly with rainfall parameters. Particulate contributions dominated hillslope fluxes at 73, 81 and 76% of total annual C, N and P, respectively. Although particulate C dominated in the microcatchmentcatchment reach (55%), N (54%) and P (69%) were dominated by dissolved forms. The lower basin zone was dominated by dissolved flux contributions at 93, 81 and 78% for C, N and P for the sub-basin outlet. These results suggested spatially varying drivers of C, N and P losses from the landscape to the ocean, via the river network. Deposition was envisaged the dominant hillslope level loss process, which gradually gave way to mineralization and biotic uptake in the river network as flux contributions shifted from being predominantly particulate to dissolved forms.

show abstract

Anthropogenic point-source and non-point-source nitrogen inputs into Huai River basin and their impacts on riverine ammonia–nitrogen flux

Cited by 48 publications

References 65 publications

Anthropogenic Phosphorus Inputs to a River Basin and Their Impacts on Phosphorus Fluxes Along Its Upstream‐Downstream Continuum

Anthropogenic Phosphorus Inputs to a River Basin and Their Impacts on Phosphorus Fluxes Along Its Upstream‐Downstream Continuum

Antibiotic resistance genes in an urban river as impacted by bacterial community and physicochemical parameters

Changes in carbon and nutrient fluxes from headwaters to ocean in a mountainous temperate to subtropical basin

Contact Info

Product

Resources

About