Phytoplankton dominates the suspended particulate nitrogen source in the Yangtze River

Zhang, Jun; Guo, Qingjun; Wang, Ziteng; Uwiringiyimana, Ernest; Wei, Rongfei; Du, Chenjun; Meng, Chunlei; Fu, Pingqing

doi:10.1016/j.jhydrol.2022.128607

Cited by 3 publications

(1 citation statement)

References 57 publications

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“…However, these studies are mainly limited to the lower reaches of the Yangtze River and near the haikou, and the influencing factors mainly focus on nutrients (TN, TP, COD, DO) and hydrographic (temperature, flow rate, turbidity) factor (Lai et al, 2013;Jiang et al, 2014;Han et al, 2020). Previous researchers have used linear regression models to demonstrate the relationship between phytoplankton and environmental factors (Zhang et al, 2022;Schermelleh-Engel et al, 2003). However, structural equation models can handle not only the relationship between visible variables, but also the causal relationship between potential variables (Jia et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of land use and environmental variables on phytoplankton community structure in high-elevation river, upper Yangtze river, China

Wang

Tian

et al. 2023

Front. Environ. Sci.

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The Qinghai-Tibet Plateau is an ecologically fragile region. The changes in physicochemical parameters of water quality [PPOWQ] and land use types [LUT] in different regions will affect the phytoplankton community in rivers, thus threatening the ecosystem. Taking the phytoplankton community as an indicator variable, it is of great significance to study the relative influence of symbiotic factors on regulating human activities and river ecological protection. The results showed that the proportions of Bacillariophyta, Cyanophyta, and Chlorophyta were >84% in the phytoplankton community of taxa composition. The abundance of the phytoplankton community varied from 1.47 × 105 to 7.58 × 105 cells/L. Bacillariophyta had the highest average abundance (>82%). The results of the variance partitioning analysis showed that PPOWQ was the main variable affecting the changes in the phytoplankton community. Redundancy analysis showed that local factors (total nitrogen, salinity, water temperature) and regional factors (forestland, grassland, unused land) (p < 0.05) were the main factors causing the changes in community structure and abundance of dominant algae. The analysis of structural equation models showed that LUT had the least direct impact on the abundance of the phytoplankton community, mainly through changing nutrients and physical parameters. Water temperature and nutrients are still the main factors affecting phytoplankton community abundance. Farmland and forestland are the main sources of total nitrogen in rivers. In general, in the ecologically vulnerable area, it is of guiding significance for the ecological monitoring and management of plateau rivers. In addition to considering water quality, it is also necessary to reasonably plan the LUT around rivers.

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Section: Introductionmentioning

confidence: 99%

Effect of land use and environmental variables on phytoplankton community structure in high-elevation river, upper Yangtze river, China

Wang

Tian

et al. 2023

Front. Environ. Sci.

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Nitrate sources and transformations along the Yangtze river and its changes after strict environmental regulation

Zhang

Wei

Zerizghi

et al. 2023

Journal of Hydrology

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The Source, Distribution, and Environmental Effects of Suspended Particulate Matter in the Yangtze River System

Fan,

Yang,

Cheng

et al. 2023

Water

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Suspended particulate matter (SPM) plays a crucial role in biogeochemical cycles in the aquatic environment because of its ubiquitous presence, mobility, and physicochemical properties. This work gathered and summarized the published information about SPM in the Yangtze River system, including source, distribution, and environmental effects. Results indicated that the SPM concentration was high in the flood period and low in the dry period. Compared to midstream and downstream, the SPM concentration was the lowest in the upstream of the Yangtze River system. Furthermore, the level of SPM concentration was influenced by human activities, such as shipping, dredging, construction of water conservancy projects, and industrial/agricultural emissions, as well as natural conditions, such as wind, rainfall, and phytoplankton. Moreover, SPM would impact the element cycle in the water environment, including N, P, heavy metal, and persistent organic pollutants. In addition, SPM adsorbed these elemental ions or particles in water on its surface. Still, this adsorption was usually unstable, and when the properties of SPM itself or external environmental conditions changed, these elements would be released into the surrounding water body. With the flow of SPM in the water, these elements migrated upstream and downstream with the river. Thus, this work reveals the current status of SPM in the Yangtze River system, which provides an essential reference for further research on SPM in the water system.

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Phytoplankton dominates the suspended particulate nitrogen source in the Yangtze River

Cited by 3 publications

References 57 publications

Effect of land use and environmental variables on phytoplankton community structure in high-elevation river, upper Yangtze river, China

Effect of land use and environmental variables on phytoplankton community structure in high-elevation river, upper Yangtze river, China

Nitrate sources and transformations along the Yangtze river and its changes after strict environmental regulation

The Source, Distribution, and Environmental Effects of Suspended Particulate Matter in the Yangtze River System

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