Dissolved organic carbon and nitrate flows in two micro-watersheds with different land uses
DOI:
https://doi.org/10.5433/1679-0359.2021v42n2p553Keywords:
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.Downloads
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Andrietti, G., Freire, R., Amaral, A. G., Almeida, F. T., Bongiovani, M. C., & Schenider, R. M. (2016). Índices de qualidade da água e de estado trófico do rio Caiabi, MT. Revista Ambiente & Água, 11(1), 162-175. doi: 10.4136/ambi-agua.1769
Beltrame, A. V. (1994). Diagnóstico do meio físico de bacias hidrográficas: modelo e aplicação. Editora da UFSC, 1(1), 112.
Bocuti, E. D., Amorim, R. S. S., Santos, T. G., Di Raimo, L. A. D. L., & Pereira, H. G. (2019). Erodibilidade entressulcos e sua relação com atributos de solos do Cerrado. Revista de Ciências Agrárias de Portugal, 42(1), 68-78. doi: 10.19084/RCA18130
Countway, R. E., Canuel, E. A., & Dickhut, R. M. (2007). Sources of particulate organic matter in surface waters of the York River, VA estuary. Organic Geochemistry, 38(3), 365-379. doi: 10.1016/j. orggeochem.2006.06.004
Creed, F. I., Webster, K., Braun, G., & Burbonniere, R. (2013). Topographically regulated traps of dissolved organic carbon create hotspots of soil carbon dioxide efflux in forests. Biochemistry, 112(1), 149-164. doi: 10.1007/s10533-012-9713-4
Eshleman, K. N., & Hemond, H. F. (1985). The role of organic acids in the acid-base status of surface waters at Bickford watershed, Massachusetts. Water Resources, 21(10), 1503-1510. doi: 10.1029/WR021i010 p01503
Galloway, J. N., Townsed, A. R., Erisman, J. W., Bekunda, M., Cai, Z., Frenei, J. R., Martinelli, L. Z., & Seitzinger, S. (2008). Transformation of the nitrogen cycle: recent trends, questions and potential solutions, Science, 320(5878), 889-892. doi: 10.1126/science.1136674
Kaiser, D. R., Reinert, D. K., Reichert, J. M., Streck, C. A., & Pellegrini, A. (2010). Nitrate and ammonium in soil solution in tobacco management systems. Revista Brasileira de Ciência do Solo, 34(2), 379-388. doi: 10.1590/S0100-06832010000200011
Lopes, F. W. A., & Magalhães, A. P. M. (2010). Influência das condições naturais de pH sobre o índice de qualidade das águas (IQA) na bacia do Ribeirão de Carrancas. Geografias, 6(2), 34-147. doi: 10.5281/ zenodo.2655928
Meister, S., Nóbrega, R. L. B., Rieger, W., Wolf, R., & Gerold, G. (2017). Process-based modelling of the impacts of land use change on the water balance in the Cerrado Biome (Rio das Mortes, Brazil). Erdkunde, 71(3), 241-266. doi: 10.3112/erdkunde.2017.03.06
Menezes, J. M., Prado, R. B., Silva., G. C. S., Mansur, K. L., & Oliveira, E. S. (2009). Qualidade da água e sua relação espacial com as fontes de contaminação antrópicas e naturais: bacia hidrográfica do rio São Domingos - RJ. Revista Engenharia Agrícola, 29(4), 687-698. doi: 10.1590/S0100-691620090004000 19
Nóbrega, R. L. B., Guzha, A. C., Torres, G. N., Kovacs, K., Lamparter, G., Amorim, R. S. S.,... Gerold, G. (2017). Effects of conversion of native cerrado vegetation to pasture on soil hydro-physical properties, evapotranspiration and streamflow on the Amazonian agricultural frontier. Plos One, 12(6), 1-12. doi: 10.1371/journal.pone.0179414
Ríos-Villamizar, E. A., Martins, A. F., & Waichman, A. V. (2011). Caracterização físico-química das águas e desmatamento na bacia do rio Purus, Amazônia Brasileira Ocidental. Revista Geografia Acadêmica, 5(2), 54-65. doi: 10.2495/WS130021
Smith, R. M., Kaushal, S. S., Beaulieu, J. J., Pennino, M. J., & Welty, C. (2017). Influence of infrastructure on water quality and greenhouse gas dynamics in urban streams. Biogeosciences, 14(11), 2831-2849. doi: 10.5194/bg-14-2831-2017
Toledo, L. G., & Nicolella, G. (2002). Índice de qualidade de água em microbacia sob uso agrícola e urbano. Scientia Agricola, 59(1), 181-186. doi: 10.1590/S0103-90162002000100026
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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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