Dissolved organic carbon and nitrate flows in two micro-watersheds with different land uses

Authors

DOI:

https://doi.org/10.5433/1679-0359.2021v42n2p553

Keywords:

Land use, Hydrology, Hydrological monitoring, Nutrient flow.

Abstract

The impacts of human activities on watersheds can change the quality and possible uses of water resources. In this context, we evaluated the flows of dissolved organic carbon (DOC) and nitrate (NO3) in the surface waters of two micro-watersheds with different anthropic impacts. Water samples were collected from two micro-watersheds with different land uses (regenerated savanna and an agricultural site) from January 2014 to April 2015. In the rainy season, the samples were collected every 15 days, while in the dry season, samples were collected every 30 days. An automatic sampler in the stream collected the composed samples. Water flow was monitored with a sensor that measured the hydraulic load on the sill of the triangular spillway installed in each micro-watershed. The DOC and NO3 contents were analyze via UV-Vis spectrophotometry. The flow was estimated based on the DOC and NO3 flows and concentrations. The DOC concentrations were higher in the Cerrado micro-watershed; however, there was no difference in NO3 concentrations. In both watersheds, there was a significant increase in the concentrations of DOC and NO3 on rainy days, with was more pronounced in the agricultural watershed. The DOC and NO3 flows were higher in the micro-watershed with Cerrado vegetation on days with rain; while on days without rain, there was no difference.

Author Biographies

Tulio Gonçalves dos Santos, Federal University of Mato Grosso

Doctoral Student of the Graduate Program in Tropical Agriculture, Federal University of Mato Grosso, UFMT, Cuiabá, MT, Brazil. fellows CAPES.

Ricardo Santos Silva Amorim, Federal University of Viçosa

Prof. Associate, Agricultural Engineering Department, Federal University of Viçosa, DEA/CCA/UFV, Viçosa, MG, Brazil.

Edwaldo Dias Bocuti, Federal University of Mato Grosso

Doctoral Student of the Graduate Program in Tropical Agriculture, Federal University of Mato Grosso, UFMT, Cuiabá, MT, Brazil. fellows CAPES.

Oscarlina Lúcia dos Santos Weber, Federal University of Mato Grosso

Profa Associate, Department of Soil and Agricultural Engineering, Faculty of Agronomy and Animal Science, UFMT, Cuiabá, MT, Brazil.

Letycia Cunha Nunes, Federal University of Mato Grosso

Master in Tropical Agriculture, UFMT, Cuiabá, MT, Brazil.

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Published

2021-02-24

How to Cite

Santos, T. G. dos, Amorim, R. S. S., Bocuti, E. D., Weber, O. L. dos S., & Nunes, L. C. (2021). Dissolved organic carbon and nitrate flows in two micro-watersheds with different land uses. Semina: Ciências Agrárias, 42(2), 553–564. https://doi.org/10.5433/1679-0359.2021v42n2p553

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