Dynamics of nutrient export from the Yangtze River to the East China sea

Wang, Hua; Yan, Huaiyu; Zhou, Fengnian; Li, Bao; Zhuang, Wei; Yang, Yilin

doi:10.1016/j.ecss.2019.106415

Cited by 12 publications

(3 citation statements)

References 58 publications

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“…Specifically, 36% of the total nitrogen and 63% of the total phosphorus inputs in the East China Sea originate from agricultural non-point source pollution [25]. A total of 4.62 Gg of TN and 0.27 Gg of TP entered the East China Sea per day from the Yangtze River, on average [36]. This resulted in a significant proliferation of algae in the East China Sea.…”

Section: The Impact Of Anthropogenic Activity On the Long-range Depen...mentioning

confidence: 99%

Space–Time Variations in the Long-Range Dependence of Sea Surface Chlorophyll in the East China Sea and the South China Sea

He,

2024

Fractal Fract

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Gaining insights into the space–time variations in the long-range dependence of sea surface chlorophyll is crucial for the early detection of environmental issues in oceans. To this end, 12 locations were selected along the Yangtze River and Pearl River estuaries, varying in distances from the Chinese coastline. Daily satellite-observed sea surface chlorophyll concentration data at these 12 locations were collected from the Copernicus Marine Service website, spanning from December 1997 to November 2023. The main objective of the current study is to introduce a multi-fractional generalized Cauchy model for calculating the values of Hurst exponents and quantitatively assessing the long-range dependence strength of sea surface chlorophyll at different spatial locations and time instants during the study period. Furthermore, ANOVA was utilized to detect the differences of calculated Hurst exponent values among the locations during various months and seasons. From a spatial perspective, the findings reveal a significantly stronger long-range dependence of sea surface chlorophyll in offshore regions compared to nearshore areas, with Hurst exponent values > 0.5 versus <0.5. It is noteworthy that the values of Hurst exponents at each location exhibit significant differences during various seasons, from a temporal perspective. Specifically, the long-range dependence of sea surface chlorophyll in summer in the nearshore region is weaker than in other seasons, whereas that in the offshore region is stronger than in other seasons. The study concludes that long-range dependence is inversely related to the distance from the coastline, and anthropogenic activity plays a dominant role in shaping the long-range dependence of sea surface chlorophyll in the coastal regions of China.

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Section: The Impact Of Anthropogenic Activity On the Long-range Depen...mentioning

confidence: 99%

Space–Time Variations in the Long-Range Dependence of Sea Surface Chlorophyll in the East China Sea and the South China Sea

He,

2024

Fractal Fract

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“…Agricultural activity and urban sewage appear to be major factors affecting the nutrient flux in the river (Chen et al, 2019;Chen et al, 2020b;Guo et al, 2021;Wang et al, 2019c). For example, there has been an enormous increase in N and P fluxes since the 1970s due to increased fertilizer use and sewage inputs in the midstream and downstream subbasins of the Changjiang River (Liu et al, 2018;Liu et al, 2022aLiu et al, , 2022b.…”

Section: Introductionmentioning

confidence: 99%

Trends in nutrients in the Changjiang River

Wang

et al. 2023

Science of The Total Environment

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“…The passive dispersal of microbes driven by river runoffs can influence microbial community structure and function along the river-to-open ocean transect [7]. The YRE is also facing pollution and eutrophication problems due to anthropogenic interference, which could damage the estuary ecosystem [8][9][10]. Environmental factors can affect the abundance and structure of bacterial communities.…”

Section: Introductionmentioning

confidence: 99%

Stochastic processes shape the aggregation of free‐living and particle‐attached bacterial communities in the Yangtze River Estuary, China

Shi

Zuo

et al. 2022

J Basic Microbiol

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An estuary plays an important role in material and energy exchange between the land and sea, where complex physical, chemical, and biological processes occur. Here, we investigated the assembly processes of free‐living (FL) and particle‐associated (PA) bacterial communities in two seawater layers at five stations in the Yangtze River Estuary (YRE) by using 16S rRNA sequencing methods. The results indicated that Proteobacteria was the most abundant phylum in the YRE. The α‐diversity of PA community was significantly higher than FL community, and analysis of similarity showed significantly different (Global R = 0.2809, p < 0.005). RDA revealed that phosphate (PO43−) was significantly correlated with PA bacterial community abundance (p < 0.05). An ecological null model showed that both PA and FL bacterial communities were mainly influenced by stochastic processes (PA: 100%, FL: 70%), which PA attached to nutrient particles and are less affected by environmental filtration. Dispersal limitation (50%) was the main assembly process of the PA community, while homogeneous selection (30%) and drift (30%) were important processes in the FL community assembly. The available substrate for colonization limits the transformation from FL to PA bacteria. This study would improve our understanding of FL and PA bacterial community structure and factors affecting assembly process in estuarine environments.

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Dynamics of nutrient export from the Yangtze River to the East China sea

Cited by 12 publications

References 58 publications

Space–Time Variations in the Long-Range Dependence of Sea Surface Chlorophyll in the East China Sea and the South China Sea

Space–Time Variations in the Long-Range Dependence of Sea Surface Chlorophyll in the East China Sea and the South China Sea

Trends in nutrients in the Changjiang River

Stochastic processes shape the aggregation of free‐living and particle‐attached bacterial communities in the Yangtze River Estuary, China

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