Influence of nitrogen inputs, dam construction and landscape patterns on riverine nitrogen exports in the Yangtze River basin during 1980–2015

Hu, Minpeng; Yao, Mengya; Wang, Yucang; Pan, Zheqi; Wu, Kaibin; Jiao, Xinyi; Chen, Dingjiang

doi:10.1016/j.jhydrol.2023.129109

Cited by 8 publications

(17 citation statements)

References 67 publications

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“…Hu et al. [ 49 ] developed regression models combining NANI, dam capacity, flow, key landscape metrics to address riverine N dynamics. Chen et al.…”

Section: Resultsmentioning

confidence: 99%

“…Empirical models are set up to provide a good explanation for the change in N/P flux by using NANI/NAPI and other factors such as runoff, land use, and so on. Hu et al [49] developed regression models combining NANI, dam capacity, flow, key landscape metrics to address riverine N dynamics. Chen et al [50] demonstrated that the exponential function is the most appropriate function to characterize the relationship between riverine N/P fluxes and NANI/NAPI and pointed out a notable differentiation in P delivery efficiency to water between NAPI n and NAPI p .…”

Section: Relationship Between Nani/napi and Export Fluxes Of N/p In R...mentioning

confidence: 99%

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Dynamic changes of net anthropogenic nitrogen/phosphorus input and its riverine export in the Beijing's subcenter

Luo,

Peng,

Shang

et al. 2024

CLEAN Soil Air Water

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Due to human activities, the overabundance of regional nitrogen/phosphorus (N/P) has a huge impact on ecological environment worldwide. It is necessary to comprehensively understand the human‐induced N/P input and spatiotemporal variations of nutrients in a river. As the adjustment to the spatial structure of Beijing, the Beijing's subcenter is an important strategic position in promoting the coordinated development of Beijing–Tianjin–Hebei. In this study, the dynamic changes of ammonia nitrogen (NH3‐N) and total phosphorus (TP) from 2012 to 2022 were analyzed, then the net anthropogenic N input (NANI) and net anthropogenic P input (NAPI) was estimated in the Beijing's subcenter. The results showed that both NH3‐N and TP had an overall downward trend with a three‐stage pattern. The NANI and NAPI declined from 5.68 × 104 and 0.95 × 104 to 0.78 × 104 and 0.15 × 104 kg km−2 per year, respectively. The chemical fertilizers input accounted for the largest part at 53–81% of NANI and 49–80% of NAPI. There were high values of N and P input in the southeast of Tongzhou, and the fluxes of N and P were positively correlated with the input of anthropogenic N and P in the Chaobai River Basin (Tongzhou District) and the Beiyun River Basin (Tongzhou District). This study would provide the foundation for setting priorities and enacting more targeted N/P management strategies in the Beijing's subcenter.

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“…Hu et al. [ 49 ] developed regression models combining NANI, dam capacity, flow, key landscape metrics to address riverine N dynamics. Chen et al.…”

Section: Resultsmentioning

confidence: 99%

Section: Relationship Between Nani/napi and Export Fluxes Of N/p In R...mentioning

confidence: 99%

Dynamic changes of net anthropogenic nitrogen/phosphorus input and its riverine export in the Beijing's subcenter

Luo,

Peng,

Shang

et al. 2024

CLEAN Soil Air Water

View full text Add to dashboard Cite

show abstract

“…The power function relation is proved to be suitable to describe the relationship between N flux, discharge, and NANI, ,,, which is experienced as Y = a × Q b × exp ( c × normalN normalA normalN normalI ) where Y and Q are dissolved N flux and discharge, respectively, and a , b , and c are constants. Equation can be converted logarithmically to Ln .25em Y = Ln ( a ) + b Ln ( Q ) + c × N A N I …”

Section: Study Area and Methodsmentioning

confidence: 99%

“…The industrial and agricultural activities in the TGR basin undergo intensive and rapid development, with anthropogenic inputs being identified as the primary N source in the basin. − The net anthropogenic nitrogen input (NANI) can be quantified using a model developed by Howarth et al, which has been successfully applied to the study of the watershed N biogeochemical cycle. − In the Yangtze River, the DIN flux exhibited a power function relationship with NANI. ,, These studies mentioned that the observed increase in riverine DIN export is not solely due to the NANI in the current year but more than 20% can be attributed to N stored from previous years. The mineralization of soil, sediments, and groundwater serves as reservoirs for stored NANI, ,, which may be affected by alterations of hydrological processes as a result of damming .…”

Section: Introductionmentioning

confidence: 99%

Nutrient Dynamics under the Coupling Effects of Damming and Urbanization in the Three Gorges Reservoir: Status, Sources, and Driving Factors

Wang,

Han,

Wang

et al. 2024

ACS Earth Space Chem.

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The coupling effect of damming and urbanization on nutrient dynamics renders the aquatic environment sensitive and vulnerable, posing a significant global concern. However, the role of damming as a source or sink of nutrients remains uncertain. In this study, river water samples were collected in the Three Gorges Reservoir (TGR), which is recognized as the world's largest hydropower engineering. By integrating solute chemistry and flux budget modeling, the status, source, and transformation of riverine nutrients were revealed, and the interplay between water storage and human inputs on TGR nutrient dynamics was discussed. The concentrations of TDN and DSi were 100.2 ± 46.1 μmol/L and 115.7 ± 14.1 μmol/L, respectively. NO 3 − −N (77.9 ± 64.1 μmol/L) was the main species of TDN, with NH 4 + −N and dissolved organic nitrogen accounting for only 2.5 and 19.7%, respectively. DSi was attributed to silicate weathering, while riverine NO 3 − −N exhibited a significant influence from anthropogenic inputs. About 71.7% of NH 4 + −N was retained or converted to NO 3 − −N by nitration along the river. Evidence from the significant correlation (p < 0.05) between NO 3 − −N/NH 4 + −N and d-excess suggests that the evaporation process accelerated by damming promotes nitrification. Through the anthropogenic net nitrogen input model, atmospheric nitrogen deposition was the primary factor affecting nitrogen flux in TGR river water, highlighting the critical impact of urbanization. The estimated contribution fluxes of stored nitrogen from 1997 to 2020 exhibited a limited contribution ratio and decrease yearly, supporting that water level rise from damming promotes the release of stored nitrogen. This study enhances the comprehension of the anthropogenic impacts on the nutrient biogeochemical cycle in damming rivers, providing enlightenment for environmental health management in large reservoirs.

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“…Wang et al (2014) reported that excess amounts of N and P in the soil are caused by the practice of returning crop residues to the field. Other studies have suggested that land slopes and the legacy of past fertilizer‐derived nutrient applications are the dominant factors affecting nutrient losses from agricultural fields (Bouraima et al, 2016; Hu et al, 2023; Vigouroux & Destouni, 2022). However, few studies have focused on how shifts in cropping systems influence nutrient losses in coastal areas.…”

Section: Introductionmentioning

confidence: 99%

Cropping system shifts enhanced nutrient yields under changing daily hydrological processes in a coastal watershed of Eastern China

Zhang

Yan

et al. 2023

Hydrological Processes

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Agricultural cropping systems in coastal areas of China have experienced significant shifts, and nitrogen (N) and phosphorus (P) losses via surface runoff from fields have considerably increased. However, it is unclear how changes in cropping systems coupled with rainfall-runoff affect nutrient losses in coastal areas. In this study, in-situ daily rainfall-runoff events in agricultural fields in the Dagu River watershed (a coastal area of Shandong Province, Southeastern China) were observed and the dissolved nutrient losses measured. The fields comprised three cropping systems-wheat-maize rotation (W-M), vegetable-maize rotation (V-M) and vegetable-vegetable rotation (V-V). The runoff yields of total dissolved nitrogen (TDN) and total dissolved phosphorus (TDP) in V-V (10.4 ± 0.8 kg N ha À1 year À1 and 3.90 ± 0.1 kg P ha À1 year À1 ) and V-M (6.52 ± 0.31 kg N ha À1 yr À1 and 2.12 ± 0.08 kg P ha À1 year À1 ) were significantly higher than those in W-M (1.51 ± 0.15 kg N ha À1 year À1 and 0.84 ± 0.08 kg P ha À1 year À1 ), and the nutrient export coefficients were 291-1271 and 146-489 kg ha À1 year À1 m runoff À1 for TDN and TDP, respectively. Remarkable shifts in cropping systems coupled with varied rainfall-runoff are dominant factors responsible for agricultural nutrient losses. TDN and TDP losses would increase by 70.0% and 59.8%, respectively, if the watershed traditional cropping system of W-M is completely replaced by V-V. The TDN and TDP losses would increase by 36.36%-46.97% under the SSP2-4.5 and SSP5-8.5 climate scenarios until 2100 with a 50% of the watershed area of traditional agricultural plantation converted to modern plantation. This study can enhance our understanding of the effects of cropping system changes coupled with varied rainfall-runoff on nutrient losses in coastal areas of China.

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Influence of nitrogen inputs, dam construction and landscape patterns on riverine nitrogen exports in the Yangtze River basin during 1980–2015

Cited by 8 publications

References 67 publications

Dynamic changes of net anthropogenic nitrogen/phosphorus input and its riverine export in the Beijing's subcenter

Dynamic changes of net anthropogenic nitrogen/phosphorus input and its riverine export in the Beijing's subcenter

Nutrient Dynamics under the Coupling Effects of Damming and Urbanization in the Three Gorges Reservoir: Status, Sources, and Driving Factors

Cropping system shifts enhanced nutrient yields under changing daily hydrological processes in a coastal watershed of Eastern China

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