Balance of nitrogen and phosphorus in a reservoir in the tropical semiarid
            region

Andrade, Eunice Maia de; Ferreira, Kássia Crislayne Duarte; Lopes, Fernando Bezerra; Araújo, Isabel Cristina da Silva; Silva, Antonio Givanilson Rodrigues da

doi:10.5935/1806-6690.20200020

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…In 2019 anoxic conditions (DO < 2 mg L − 1 ) were observed even in the surface layers. High TP concentration in deep layers under anoxic conditions is a strong indicator of internal loading effect (Lopes et al, 2014;Andrade et al, 2020). Internal P loading may account for about 54% in TP w increase (Ding et al, 2018).…”

Section: Tp and Do Variation Among And Within Reservoirsmentioning

confidence: 99%

Internal phosphorus loading and its driving factors in the dry period of Brazilian semiarid reservoirs

Rocha

Neto

2022

Journal of Environmental Management

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Section: Tp and Do Variation Among And Within Reservoirsmentioning

confidence: 99%

Internal phosphorus loading and its driving factors in the dry period of Brazilian semiarid reservoirs

Rocha

Neto

2022

Journal of Environmental Management

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“…The variable, chlorophyll a, had a high weight (>0.825), and is considered an indicator of the presence of nutrients, especially phosphorus and nitrogen, as seen in component 1. The presence of chlorophyll a in aquatic systems represents the effect of the eutrophication process, which is the phenomenon by which an ecosystem becomes increasingly productive through enrichment with nutrients (ANDRADE et al, 2020;CHAVES et al, 2019;LOPES et al, 2014a). Eutrophication has an environmental impact on a global scale, and is one of the most serious problems related to water conservation (SCHINDLER, 2012).…”

Section: Resultsmentioning

confidence: 99%

Dinâmica limnológica em reservatório artificial e rio intermitente na região semiárida em função do uso e ocupação do solo

Duarte

Pereira

Lima

et al. 2021

RCA

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Remote sensing coupled with the measurement of physical, chemical and biological variables is an important tool in water resource management. The aim of this study, therefore, was to evaluate the dynamics of the physical, chemical and biological variables of the waters of an intermittent river and an artificial surface reservoir using multivariate analysis and in response to land use and occupation in the hydrographic basin. The study was carried out in the hydrographic basin of the River Cruxati in four study areas (three river areas and one artificial reservoir), with images obtained from the OLI sensor of the Landsat-8 satellite. The limnological variables measured were pH, electrical conductivity, dissolved oxygen, turbidity, nutrients (total nitrogen and total phosphorus) and chlorophyll a. The limnological variables were analysed using Principal Component Analysis -PCA, Tukey's test and Cluster Analysis. Eutrophication of the areas under study was calculated using the Trophic State Index. The PCA allowed three components to be selected that indicated the quality of the surface water, river and artificial reservoir, explaining 88.57% of the total variance. The limnological variables responsible for the grouping were electrical conductivity, dissolved oxygen and turbidity. Land use and occupation has influenced water quality in the stretches of river. Anthropisation has had an influence on the levels of dissolved oxygen, and the presence of agricultural areas has caused an increase in turbidity. However, the most conserved landscape (artificial reservoir) had the highest degree of eutrophication due to the difference in water dynamics between the lentic and lotic environments.

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“…Also, anthropogenic impacts, such as siltation and artificial eutrophicationwhich are generally caused by point and diffuse source pollutionare progressively worse and more frequent worldwide. These processes' dynamics are heightened in tropical environments, where the alternation between seasonshot and humid weather in the summer, followed by a cold and dry period in the winterlead to an increased capacity for nutrient uptake and consequent rapid growth of algae and aquatic plants (Lewis 2000;Hennemann and Petrucio 2010;Andrade et al 2020). As a result, some limnological variables may have values out of the adequate water quality range, and the reservoir may fail to fulfil its multiple uses.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence in the estimation of chlorophyll-a in public water reservoirs in the Brazilian cerrado

Souza de Barros,

de Almeida,

Moraes Soares

et al. 2024

Mar. Freshw. Res.

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Context The usual strategy for monitoring of eutrophication process is the use of traditional limnological methods, based on laboratory analysis. These procedures involve costly and time-consuming analyses, usually with in vitro methodologies, which can still have limitations in terms of sensitivity and reliability, if poorly managed. Phytoplankton pigments, such as chlorophyll-a (Chl-a), are highly fluorescent and can provide the environmental status of water bodies. Aims This study aims to analyse, compare and evaluate an estimation of Chl-a through fluorescence in public water sources in the Brazilian cerrado. Exploratory statistical analyses were conducted by using absolute fluorescence units (AFU) and relative fluorescence units (RFU) compared with traditional laboratory data (standard procedure for the determination of Chl-a by spectroscopic methods) to evaluate the significance of differences in estimating Chl-a concentration. Subsequently, empirical models, based on spectral band combinations, were generated to convert fluorescence measurement in Chl-a concentration, by linear regression. Key results The generated model found a strong correlation and coefficient of determination (r = 0.88; R2 = 0.78). The efficiency of the model was also confirmed by statistical indicators (RMSE = 1.27, MAPE = 26.72 and BIAS = −6.32). Conclusions We concluded that the estimate of Chl-a through RFU was better than through AFU. Implications Therefore, based on the results of this study, it is recommended that RFU be used to obtain more precise and accurate estimates of Chl-a concentration through empirical models based on linear regression.

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Balance of nitrogen and phosphorus in a reservoir in the tropical semiarid region

Cited by 10 publications

References 2 publications

Internal phosphorus loading and its driving factors in the dry period of Brazilian semiarid reservoirs

Internal phosphorus loading and its driving factors in the dry period of Brazilian semiarid reservoirs

Dinâmica limnológica em reservatório artificial e rio intermitente na região semiárida em função do uso e ocupação do solo

Fluorescence in the estimation of chlorophyll-a in public water reservoirs in the Brazilian cerrado

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