Permeability of riparian forest strips in agricultural, small subtropical watersheds in south-eastern Brazil

Autor(es)

Ferreira, Anderson ^[1] ; Possebon Cyrino, Jose Eurico ^[2] ; Duarte-Neto, Paulo Jose ^[3] ; Martinelli, Luiz Antonio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Energia Nucl Agr, Lab Ecol Isotop, BR-13416970 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Zootecnia, BR-13418900 Piracicaba, SP - Brazil

^[3] Univ Fed Rural Pernambuco, Unidade Acad Garanhuns, Garanhuns, PE - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MARINE AND FRESHWATER RESEARCH; v. 63, n. 12, p. 1272-1282, 2012.
• Citações Web of Science: 13

Resumo

If riparian buffer zones are ineffective in preventing C-4 plant carbon from upland areas reaching the stream sediment, the composition of stream fauna can be significantly altered. The permeability of riparian forest strips in agricultural, small subtropical watersheds in south-eastern Brazil was measured in nine watersheds categorised according to the predominant land cover of the legally required 30-m buffer riparian zone. Four watersheds with well preserved riparian forest along the 30-m buffer zone were designated as FOREST watersheds; three watersheds, with a predominance of C-4 grasses from sugarcane to pasture, mixed with preserved riparian forests, were designated MIXED watersheds; and two watersheds were termed PASTURE-SUGAR because their entire 30-m buffer zone was covered by C-4 plants. Stable carbon (delta C-13) isotopes were used as tracers of upland C-4 carbon in sediments, suspended particulate organic carbon, terrestrial and aquatic invertebrates and two species of neotropical fish. Although the intact 30-m buffer zone of riparian forests did not entirely prevent the input of C-4 to the river environment and food web, there was a significant increase in C-4 carbon in those watersheds where the buffer zone was not covered by riparian forests. These findings emphasise the importance of riparian forests in mitigating disturbance in streams and support efforts to preserve such riparian corridors. (AU)

• Processo FAPESP: 03/10505-0 - Ecologia alimentar e ecomorfologia de tetragonopterinae (osteichtyes, characiformes, characidae) e suas interacoes com a estrutura da vegetacao riparia, em riachos da bacia do rio passa-cinco, sp.
• Beneficiário: Anderson Ferreira
• Linha de fomento: Bolsas no Brasil - Doutorado