Vulnerabilidade à eutrofização de dois lagos tropicais de climas úmido (Cuba) e semiárido (Brasil)

Wiegand, Mario Cesar; Piedra, Julio Iván González; Araújo, José Carlos de

doi:10.1590/s1413-41522016139527

Cited by 25 publications

(29 citation statements)

References 34 publications

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“…Tropical reservoirs under dry conditions are more prone to eutrophication than those in humid environments, since nutrient accumulation in the formers is favoured by hydrological features such as low and highly variable inflows as well as high evaporation rates (Wiegand et al 2016). In the State of Ceará, where Tijuquinha is located, high trophic states are observed particularly during droughts: for instance, all strategic reservoirs in the Banabuiú basin (19,800 km² in the central portion of the state) had volumes higher than 80% of their storage capacities after the wet period of the year 2009, and 55% presented high eutrophication level (eutrophic or hypereutrophic).…”

Section: Indexmentioning

confidence: 99%

Modelling the impact of sediment management on the trophic state of a tropical reservoir with high water storage variations

Lira

Neto

2020

An. Acad. Bras. Ciênc.

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Eutrophication of lakes has affected society in many regions, particularly in water scarce environments where: i) low runoff reduces the self-purification potential of water bodies; ii) water supply relies on surface reservoirs, which are susceptible to nutrient enrichment. This work presents an assessment of the impact of the silted sediment management on the trophic status of a tropical surface reservoir with intense temporal variability of water storage. A complete mixing model describing the total phosphorus budget in the water and sediments was used, based on semi-empirical formulations. The sediment reuse as soil fertilizer has been proposed to increase productivity in small scale agriculture, which should also enhance the water quality by removing the nutrient-enriched sediment from lakes. Model application for a 40-years period indicate that sediment management may improve water quality, changing from poor to acceptable trophic state during roughly 10% of the time when the reservoir is not empty.

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Section: Indexmentioning

confidence: 99%

Modelling the impact of sediment management on the trophic state of a tropical reservoir with high water storage variations

Lira

Neto

2020

An. Acad. Bras. Ciênc.

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“…A média de pH nos cinco pontos de coleta foi de 8,2 sendo considerado suavemente alcalino segundo Wiegand et al (2016). A figura 9 apresenta o detalhamento desses resultados, com variação entre 7,9 a 8,5.…”

Section: Resultsunclassified

Degradação ambiental no Açude de Bodocongó na cidade de Campina Grande, Paraíba

et al. 2018

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Resumo: O Açude de Bodocongó localizado na cidade de Campina Grande, Paraíba vem sofrendo ações antrópicas ao longo dos anos que contribuem para a degradação das suas águas, mas também degradam o ambiente a qual o açude está inserido. Sendo assim, este estudo objetivou-se analisar a degradação ambiental no entorno do Açude de Bodocongó, diagnosticando a qualidade da água por meio de parâmetros como pH, temperatura da água, oxigênio dissolvido, condutividade elétrica e sólidos totais dissolvidos. O estudo foi realizado em julho de 2016, de modo que foram realizadas medições in loco desses parâmetros três vezes por semana com o auxílio de aparelhos eletrônicos digitais. A análise da degradação ambiental no entorno do açude foi realizada por meio da observação dos fenômenos que contribuem para a deterioração desse ecossistema aquático. Os resultados obtidos para os parâmetros avaliados mostram que o oxigênio dissolvido, condutividade elétrica e sólidos totais dissolvidos estão fora dos padrões recomendados, refletindo a contaminação dessas águas. Sendo assim, as ações antrópicas como lançamento de efluentes e resíduos sólidos, assim como a lavagem de veículos nas margens do açude intensificam a degradação ambiental nessa área. A educação ambiental seguida de políticas públicas voltadas para recuperação dessa área são instrumentos necessários e urgentes para que o Açude de Bodocongó possa recuperar as condições físicas, químicas e biológicas naturais. Palavras-chave: Ações antrópicas; Poluição da água; Corpos de água urbanos. Abstract:The Bodocongó weir located in the city of Campina Grande, Paraíba, has suffered anthropic actions over the years that contribute to the degradation of its waters, but also degrade the environment to which the weir is inserted. Thus, this study aimed to analyze the environmental degradation in the surroundings of the Bodocongó weir, diagnosing the water quality through parameters such as pH, water temperature, dissolved oxygen, electrical conductivity and total dissolved solids. The study was conducted in July 2016, so measurements were performed "in loco" of these parameters three times a week with the aid of digital electronic devices. The analysis of the environmental degradation around the weir was carried out by observing the phenomena that contribute to the deterioration of this aquatic ecosystem. The results obtained for the evaluated parameters show that the dissolved oxygen, electrical conductivity and total dissolved solids are outside the recommended standards, reflecting the contamination of these waters. Therefore, anthropogenic actions such as effluent and solid waste disposal, as well as vehicle washing at the banks of the dam, intensify environmental degradation in this area. Environmental education followed by public policies aimed at the recovery of this area are necessary and urgent instruments for the Bodocongó weir to recover natural physical, chemical and biological conditions.

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“…An excess of N and P in water triggers the widely investigated eutrophication phenomenon (Smith and Schindler, 2009;Bachmann et al, 2013;Fontana et al, 2014;Smith et al, 2014;Andrietti et al, 2016;Grilo et al, 2016;Wiegand et al, 2016).…”

Section: Nitrate (No 3 -mentioning

confidence: 99%

Impacts of Pig Slurry Applied to Two Different Soils on Nutrient Transport by Runoff

Kaufmann

Bertol

Santos

et al. 2019

Rev. Bras. Ciênc. Solo

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Runoff in agricultural areas with intensive application of pig slurry can transport significant amounts of nutrients. This study evaluates the effects of different pig slurry (PS) application rates (0, 50, 100, and 200 m 3 ha-1) on nutrient loss through runoff during soybean cultivation under no-tillage. It was conducted at two sites in southern Brazil, one on an Alfisol (27° 43' south and 50° 3' west) and one on an Inceptisol (27° 47' south and 50° 18' west). The PS was applied to the soil once at the beginning of the soybean cycle. Each plot was 11 m long in the direction of the slope and 3.5 m wide. To induce runoff, artificial rainfall was applied in four different tests (T1, T2, T3, T4), with an intensity of 65 mm h-1 for 90 minutes. The first test was performed one day after PS application, while the other tests were performed throughout the soybean cycle. During each test, runoff samples were collected at 10-min intervals after the beginning of runoff. The runoff amount and the NO 3-, NH 4 + , P, and K + concentrations in the runoff were measured. In T1, nutrient transport from the Alfisol and the Inceptisol increased with increasing PS doses. In some cases, this effect was still noticeable in T2 and T3, but not in the last test (T4). The transported amounts of NO 3-, NH 4 + , P, and K + decreased as the period between PS application and simulated rainfall increased. Regardless of the soil and the treatment, NO 3 was transported in the greatest quantities, followed by K + , NH 4 + , and P.

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Vulnerabilidade à eutrofização de dois lagos tropicais de climas úmido (Cuba) e semiárido (Brasil)

Cited by 25 publications

References 34 publications

Modelling the impact of sediment management on the trophic state of a tropical reservoir with high water storage variations

Modelling the impact of sediment management on the trophic state of a tropical reservoir with high water storage variations

Degradação ambiental no Açude de Bodocongó na cidade de Campina Grande, Paraíba

Impacts of Pig Slurry Applied to Two Different Soils on Nutrient Transport by Runoff

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