Study on nutrient limitation of phytoplankton growth in Xiangxi Bay of the Three Gorges Reservoir, China

Huang, Yanan; Li, Yiping; Ji, Daobin; Nwankwegu, Amechi S.; Lai, Qiuying; Yang, Zhengjian; Wang, Kai; Jin, Weiqing; Norgbey, Eyram

doi:10.1016/j.scitotenv.2020.138062

Cited by 33 publications

(12 citation statements)

References 64 publications

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“…The nal concentrations of all nutrients were 1.0 mgNL − 1 for N (NO3 and NH4), 0.1 mgPL − 1 for P, 6 mgSiL − 1 for Si, and 0.1 mgL − 1 each for the trace metals. These concentrations were based on the nutrient characteristics in XXB reported in our previous studies (Li et al, 2020;Huang et al, 2020;Nwankwegu et al, 2020a). The concentrations were intended to be higher than the in-situ concentrations to alleviate any potential scenario of nutrient limitation that could mask the effect of other factors essential for growth (Li et al, (Nwankwegu et al, 2020a;Nwankwegu et al, 2020b;Xu et al, 2015) across the microcosms including the control at the beginning of the study.…”

Section: Nutrient Addition Bioassay Experimentsmentioning

confidence: 99%

“…Total nitrogen (TN), total phosphorus (TP) and dissolved nutrients TDN, and TDP were analyzed by combined persulfate digestion and further followed by spectrophotometric analysis for nitrate-nitrogen (NO 3 − -N). Ammonium nitrogen (NH 4 + -N) was analyzed using the indophenol blue method (Huang et al, 2020). Biological parameters which included identi cation of phytoplankton genera and chlorophyll a (Chl-a) also followed.…”

Section: Water Sample Analysismentioning

confidence: 99%

“…Phytoplankton samples were xed with Lugol's iodine solution (2% nal concentration) and settled for 48 h and identi ed (Li et al, 2020;Huang et al, 2020). Algal cell density was microscopically measured using a Sedgwick -Rafter counting chamber at magni cations of 320-400x (Nwankwegu et al, 2020b;Xu et al, 2013).…”

Section: Water Sample Analysismentioning

confidence: 99%

“…Considering the constantly changing climate and increasing anthropogenic actions (Nwankwegu et al, 2019) from urban discharge, agro-fertilizers, and the mining activities in the XXB catchments, the eutrophication impacts, trace metal pollution, and the seasonal pattern of the phytoplankton dominance in the tributary are likely to have changed over time. The few recent studies which involved microelements, nutrient limitation, phytoplankton community structure and water quality trends (Nwankwegu et al, 2020a;Huang et al, 2020;Li et al, 2019), are potentially limited by time as these studies characterized the ecosystem functions based on single-seasonal outcome and conclusions drawn from a point monitoring evidence which may not essentially apply to the other points across the tributary to the mainstream. Again, a recent study which evaluated the spatial distribution of microelement in the entire bay only considered iron (Fe) alone (Nwankwegu et al, 2020b).…”

Section: Introductionmentioning

confidence: 99%

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Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

Nwankwegu

Zhang

et al. 2021

Preprint

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The freshwater ecosystem characteristics in terms of nutrient inventory across seasons, spatial variations of chl-a biomass, and the phytoplankton community structure are prudent ecological assessment indices for a bloom management protocol. We evaluated the spatial and seasonal chl-a distribution under different nutrient conditions and phytoplankton community structure in a eutrophic Three Gorges reservoir tributary China. Result showed significant variations in biomass production with the mainstream reaches severely affected. The nutrient addition bioassay demonstrated significant stimulations on growth in both autumn and summer. The nutrient limitation pattern shifted from P in autumn and spring to N limitation during summer. Combined additions of trace metals with N, P, and Si in autumn and Fe alone enrichment in summer and spring showed maximum productivity. The phytoplankton community structure demonstrated strong sensitivities to seasonal variabilities with regime shift from Cyanophyta, dominated by the toxic and hypoxia generating, Microcystis spp in both autumn and summer, the Cryptophyta dominated by the Chroomonas acuta in spring to the Bacilliariophyta dominated by the genera, Cyclotella in winter. This reflected the ability of the Bacilliariophyta to thrive under a low-temperature condition. Combined N&P led to significant growth stimulation in summer while P alone controlled the bulk of the growth in autumn. The study points to the need for extending mitigation steps to the mainstream towards achieving lasting bloom management solution in the impacted tributary.

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Section: Nutrient Addition Bioassay Experimentsmentioning

confidence: 99%

Section: Water Sample Analysismentioning

confidence: 99%

Section: Water Sample Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

Nwankwegu

Zhang

et al. 2021

Preprint

Self Cite

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“…Eutrophication of inland waters was a topic of widespread interest in the 1960s and 1970s (Ai et al 2015;Huang et al 2020). Several studies have shown that nutrient indicators such as nitrogen and phosphorus are important nutrients that determine the degree of eutrophication in water bodies (Gilbert & Burford 2017).…”

Section: Introductionmentioning

confidence: 99%

Contribution of the reservoir backflow to the eutrophication of its tributary: a case study of the Xiangxi River, China

Luo

Luo²,

et al. 2022

Hydrology Research

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Based on the routine water quality monitoring data of the Xiangxi River and its main monitoring section from January 2014 to May 2016, the monthly dynamics of nutrient concentrations and fluxes were analyzed, and the relationship between the water exchange between the reservoir and the tributaries and the changes of nutrient fluxes in the river was established. The results showed that the nutrient flux in the Xiangxi bay estuary was negatively correlated with the reservoir reflux intensity, and the overall correlation coefficient was −0.52. Four nutrient indexes, total nitrogen, total phosphorus, ammonia nitrogen (), and soluble phosphorus, all showed the same regularity and characteristics, among which was particularly prominent. It can be concluded that the variation of nutrient salts in the water body of the tributary bay is mainly determined by the water exchange between the reservoir and the tributary. In addition, the change of chemical oxygen demand and chlorophyll a flux in the Xiangxi Bay and water exchange in the reservoir area were analyzed. We found that changes in the hydraulic conditions of the return flow in the reservoir area can destroy the suitable flow environment necessary for the survival of algae, thus preventing the proliferation of harmful algae. Therefore, by controlling the hydrodynamic conditions between the reservoir area and the tributaries and changing the degree of water exchange between them, the objective of improving the water environment in the Xiangxi Bay can be achieved to a large extent.

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A study on the occurrence of black water in reservoirs in Eucalyptus Plantation region

Fan

Norgbey

et al. 2020

Environ Sci Pollut Res

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Study on nutrient limitation of phytoplankton growth in Xiangxi Bay of the Three Gorges Reservoir, China

Cited by 33 publications

References 64 publications

Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

Spatial Biomass Production And Seasonal Nutrient Limitation Transitions In A Tributary of The Three Gorges Reservoir, China

Contribution of the reservoir backflow to the eutrophication of its tributary: a case study of the Xiangxi River, China

A study on the occurrence of black water in reservoirs in Eucalyptus Plantation region

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