Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X5121
Acta Limnologica Brasiliensia
Original Article

Natural and anthropic inputs of nutrients in hydrographic basins of reservoirs in the Brazilian semiarid

Aportes naturais e antrópicos de nutrientes em bacias hidrográficas de reservatórios do semiárido brasileiro

Herbster Ranielle Lira De-Carvalho; Gustavo Gonzaga Henry-Silva

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Abstract

Abstract:: Aim: Estimate the input of loads of N and P emitted by natural (atmospheric deposition and soil denudation) and anthropogenic (agriculture, livestock and sewage) factors for the hydrographic basins of two reservoirs in the Brazilian semiarid region (Mendubim and Umari).

Methods: In the present work, we use georeferenced data provided by official agencies, data presented in academic papers, field samples and laboratory analysis of emission factors in the estimates of nitrogen and phosphorus inputs in reservoir basins of Brazilian semiarid region.

Results: Soil denudation was identified as the main natural source of N and atmospheric deposition as the main source of P in both basins. Among the anthropogenic sources, the main source of N and P, for the two basins, was livestock. The total loads (natural and anthropogenic) of N (579.01 tonne. year-1) and P (136.35 tonne. year-1) received by the Umari basin was, respectively, 43.90% and 22.10% higher than those received by Mendubim, with a predominance of anthropogenic sources in both nitrogen and phosphorus emission.

Conclusions: The results showed the importance of monitoring human activities that can enhance nutrient inputs, such as nitrogen and phosphorus, in basins of the Brazilian semiarid region. The quantification of the emission factors analyzed here can be a tool in the development of strategies to mitigate the problems that high concentrations of N and P can bring to the quality and use of water in semiarid reservoirs.

Keywords

soil denudation, eutrophication, anthropogenic sources, natural sources, livestock

Resumo

Resumo:: Objetivo: Estimar o aporte de cargas de N e P emitidas por fatores naturais (deposição atmosférica e desnudação do solo) e antrópicos (agricultura, pecuária e águas servidas) para as bacias de contribuição de dois reservatórios do semiárido brasileiro (Mendubim e Umari).

Métodos: No presente trabalho, utilizamos dados georreferenciados disponibilizados por órgãos oficiais, dados apresentados em trabalhos acadêmicos, coletas de campo e análise laboratorial nas estimativas dos aportes de nitrogênio e fósforo para as bacias hidrográficas de dois reservatórios semiárido brasileiro.

Resultados: O desnudamento do solo foi identificado como a principal fonte natural de N e a deposição atmosférica como a principal fonte de P, em ambas as bacias de contribuição. Dentre as fontes antrópicas, a principal fonte de N e P, para as duas bacias, foi a pecuária. As cargas totais (naturais e antrópicas) de N (579,01 tonne.ano-1) e P (136,35 tonne.ano-1) recebidas pela bacia de contribuição de Umari foram, respectivamente, 43,9% e 22,1% superiores às recebidas por Mendubim, com predominância de fontes antropogênicas tanto na emissão de nitrogênio quanto de fósforo.

Conclusões: Os resultados mostraram a importância do monitoramento de atividades antrópicas que possam potencializar aportes de nutrientes, como nitrogênio e fósforo, em bacias do semiárido brasileiro. A quantificação dos fatores de emissão aqui analisados ​​pode ser uma ferramenta no desenvolvimento de estratégias para mitigar os problemas que altas concentrações de N e P podem trazer para a qualidade e uso da água em reservatórios do semiárido.
 

Palavras-chave

desnudamento do solo, eutrofização, fontes antropogênicas, fontes naturais, pecuária

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Submitted date:
08/06/2021

Accepted date:
09/20/2022

Publication date:
11/17/2022

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