Influence of landscape properties on stream water quality in agricultural catchments in Southeastern Brazil

Autor(es)

Mori, Gisele Biem ^[1] ; de Paula, Felipe Rossetti ^[1] ; de Barros Ferraz, Silvio Frosini ^[2] ; Monteiro Camargol, Antonio Fernando ^[1] ; Martinelli, Luiz Antonio ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Julio de Mesquita Filho UN, Dept Ecol, Rio Claro, SP - Brazil

^[2] ESALQ, Dept Ciencias Florestais, Piracicaba, SP - Brazil

^[3] CENA, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANNALES DE LIMNOLOGIE-INTERNATIONAL JOURNAL OF LIMNOLOGY; v. 51, n. 1, p. 11-21, 2015.
• Citações Web of Science: 7

Resumo

Changes in land cover, especially the replacement of forest by agricultural activities affect the hydrological processes of river catchments, resulting in physical and chemical compositional changes of water draining from affected basins. The aim of this study was to evaluate landscape influences at different spatial scales (catchment and riparian) on the physical and chemical composition of stream water in 15 agricultural catchments, belonging to the Corumbatai basin (Brazil). We calculated the average slope (%), average elevation (m), soil classes (%), major land use classes (%), average distance from the forest cover in relation to the hydrographic network (m), largest patch index (%) at the catchment scale and riparian zone of drainage network scale within a 30 m buffer. Water samples were collected in two seasons (dry and rainy) to characterize physical and chemical properties: turbidity, suspended solids, total nitrogen, nitrate and total phosphorus. Our results showed higher concentration of nitrate in sugarcane fields and larger amount of suspended solids and turbidity in pasture areas. We concluded that degraded and highly fragmented forests may not be effectively contributing toward the protection of aquatic ecosystems. (AU)

• Processo FAPESP: 06/04723-3 - Influência da paisagem na entrada de matéria vegetal (troncos) e na estrutura de canais em microbacias da Bacia do Rio Corumbataí, SP
• Beneficiário: Silvio Frosini de Barros Ferraz
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/08753-0 - A influência do uso da terra nas características limnológicas da água em microbacias: um estudo de caso na bacia do rio Corumbataí, SP
• Beneficiário: Gisele Biem Mori
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica