Net anthropogenic nitrogen and phosphorus inputs in the Yangtze River economic belt: spatiotemporal dynamics, attribution analysis, and diversity management

Deng, Chenning; Liu, Lusan; Peng, Danling; Li, Haisheng; Zhao, Ziyang; Lyu, Chunjian; Zhang, Zeqian

doi:10.1016/j.jhydrol.2021.126221

Cited by 41 publications

(9 citation statements)

References 58 publications

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“…Spatiotemporal variations may be caused by differences in precipitation in different regions, , land-use patterns, , and socioeconomic development . Changes in hydrological conditions of the YRB due to seasonal rainfall can vary the river input, component characteristics, and dilution of exogenous pollutants .…”

Section: Discussionmentioning

confidence: 99%

Assessment and Identification of Primary Factors Controlling Yangtze River Water Quality

et al. 2023

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Challenges for rapid dam construction remain, including pollutant trajectories after construction, how socioeconomic developments drive long-term water quality and large spatial changes, and which indicators primarily control these changes. Here, high-density sampling and socioeconomic data were integrated to assess primary factors controlling Yangtze River water quality. Our results indicated that the pollutant trajectories in the upper and lower sections differ, owing to the Three Gorges Dam. From 2003 to 2020, the decreased TP, NH4 +-N, and CODMn concentrations were strongly correlated to the per capita gross domestic product, drainage pipe length, number of wastewater treatment plants, and fertilizer consumption. Moreover, Se and Cd concentrations decreased, whereas Ni and Zn concentrations increased from 2007 to 2020. The water quality index (WQI) demonstrated that Yangtze River water quality varies from levels “good” to “excellent”, is better in the winter, and deteriorates with decreasing distance from the estuary. Furthermore, an optimized WQI model consisting of six crucial parameters (TN, Pb, Cd, Zn, NO3 ––N, and As) was built using the random forest method, which exhibits excellent performance in water quality assessment. The approach proposed in the present study can significantly reduce the number of parameters required to assess water quality without compromising the results.

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Section: Discussionmentioning

confidence: 99%

Assessment and Identification of Primary Factors Controlling Yangtze River Water Quality

et al. 2023

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“…Compared to other basins in the world, the NANI values in the Pearl River basin was also higher than 5861 kg N km −2 y −1 in the Michigan basin in the USA [10] and 8800 kg N km −2 y −1 in the Baltic Sea basin in Europe [11]. Compared to other basins in China, NANI values in the Pearl River basin were higher than those in the Yellow River basin (6787 kg N km −2 y −1 ) [35], the Yangtze River basin (7297 kg N km −2 y −1 ) [41], and the Three Gorges Reservoir Area (12,399 kg N km −2 y −1 ) [16], and lower than that in the Huaihe River basin (28,000 kg N km −2 y −1 ) [20].…”

Section: Comparison Of Nani and Its N Input Sources With Other Region...mentioning

confidence: 95%

Effect of Agricultural Structure Adjustment on Spatio-Temporal Patterns of Net Anthropogenic Nitrogen Inputs in the Pearl River Basin from 1990 to 2019

Jiaogen

Lei

et al. 2023

Land

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Worldwide urbanization has brought dramatic changes in agricultural structures, as well as serious agricultural non-point source pollutions of nitrogen and phosphorus. However, understanding the effect of agricultural structure adjustment on net anthropogenic nitrogen inputs (NANI) has been still limited. In this paper, statistical data from the agricultural statistical Yearbook, the National Economic and Social Development Statistical Bulletin were collected from 1990 to 2019 in the Pearl River Basin, China, and used to analyze the spatial and temporal patterns of NANI and its influencing factors. The results indicated that the agricultural structure adjustment has significantly influenced the spatial and temporal patterns of NANI in the last 30 years in the Pearl River Basin. The NANI decreased from 1990 to 2019, and had a spatial pattern of higher values in the upstream areas and lower in the downstream areas. In terms of the nitrogen input sources of NANI, in the economically developed regions downstream, nitrogen inputs are dominated by food/feed nitrogen, which accounted for an average of 49.6% of total nitrogen inputs. In upstream areas with relatively low economic development, fertilizer nitrogen accounted for an average of 54.9% of total nitrogen inputs. A novel nitrogen input source index of NANI, namely the ratio of agricultural nitrogen inputs to non-agricultural nitrogen inputs of NANI(ASNA), was also proposed to characterize the impact of the agricultural industry restructuring on NANI changes over time. Similar to the characteristics of NANI from 1990 to 2019, the ASNA showed a decreasing trend in the study area. Moreover, agricultural variables (agricultural land area, nitrogen fertilizer consumption and livestock farming density) tended to contribute less to the explained ASNA variances, while the contributions of the non-agricultural factors (population density and non-agricultural GDP) increased from 1990 to 2019. This indicated that the contribution of nitrogen inputs from agricultural sources to the NANI decreased while the contribution of nitrogen inputs from non-agricultural sources increased, with the shifts of agricultural sectors to the secondary and tertiary sectors in the Pearl River Basin. Our findings also suggest that differently regional targeting should be considered for the nitrogen pollution management in the Pearl River Basin, which focuses on the nitrogen pollution management of non-agricultural sources in the downstream areas, and but highlights agricultural nitrogen pollution management in the upstream areas.

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“…The Yangtze River is the largest river in China, and the population and gross domestic product of the Yangtze River Economic Belt account for more than 40% of those in all of China (She et al, 2019). The high load of nitrogen and other pollutants in the Yangtze River has attracted extensive attention, with the net anthropogenic inputs of nitrogen and phosphorus to Yangtze River being 7,292 kg N km − 2 yr − 1 and 2,306 kg P km − 2 yr − 1 , respectively (Deng et al 2021). During sample collection, we used a grab sampler to collect surface sediment (0-10 cm depth) from the Yangtze River.…”

Section: Sediment Collectionmentioning

confidence: 99%

Effect of redox conditions on the release of dissolved organic matter and nutrients at the sediment-water interface and the role of microbes

Bao

Wang

et al. 2022

Preprint

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The dynamics of nutrients are closely related to microbial activities and substantially influenced by the redox conditions. This study conducted an incubation experiment on sediment under different redox conditions. Concentrations of dissolved organic carbon (DOC), nitrogen, and phosphorus were measured to investigate the release of nutrients from the sediment. An excitation-emission matrix and PARAFAC analysis were used to characterize dissolved organic matter (DOM). The structure of microbes and functional genes were analyzed via high-throughput sequencing and real-time polymerase chain reaction. Oxic conditions decreased the NH4+ and NO2− concentrations and reduced the increases in total nitrogen and DOC concentrations. Oxic conditions also exhibited a higher alpha diversity index and microbial community abundance. Regarding functional genes, the expression levels of nitrification genes (amoA) increased under all redox conditions, especially under oxic and original conditions, which explained the removal of ammonia nitrogen. Higher expression levels of nitrite-reducing genes (nirK and nirS) were found in oxic environments owing to the abundant NO3− supply. The expression of the anammox gene (hzo) is stimulated in anoxic environments, which contributes to the lack of oxygen and a higher concentration of NH4+.

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Net anthropogenic nitrogen and phosphorus inputs in the Yangtze River economic belt: spatiotemporal dynamics, attribution analysis, and diversity management

Cited by 41 publications

References 58 publications

Assessment and Identification of Primary Factors Controlling Yangtze River Water Quality

Assessment and Identification of Primary Factors Controlling Yangtze River Water Quality

Effect of Agricultural Structure Adjustment on Spatio-Temporal Patterns of Net Anthropogenic Nitrogen Inputs in the Pearl River Basin from 1990 to 2019

Effect of redox conditions on the release of dissolved organic matter and nutrients at the sediment-water interface and the role of microbes

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