Dynamics of Dissolved Forms of Carbon and Inorganic Nitrogen in Small Watersheds of the Coastal Atlantic Forest in Southeast Brazil

Autor(es)

Andrade, Tatiana M. B. ^[1] ; Camargo, Plinio B. ^[1] ; Silva, Daniela M. L. ^[2] ; Piccolo, Marisa C. ^[1] ; Vieira, Simone A. ^[1] ; Alves, Luciana F. ^{[3, 1, 4]} ; Joly, Carlos A. ^[5] ; Martinelli, Luiz A.

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo USP, Lab Ecol Isotop, Ctr Energia Nucl Agr, BR-13416100 Piracicaba, SP - Brazil

^[2] Univ Estadual Santa Cruz UESC, Ilheus, BA - Brazil

^[3] Inst Bot, Secao Ecol, Sao Paulo - Brazil

^[4] Univ Colorado, Inst Arct & Alpine Res INSTAAR, Boulder, CO 80309 - USA

^[5] Univ Campinas UNICAMP, Inst Biol, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: WATER AIR AND SOIL POLLUTION; v. 214, n. 1-4, p. 393-408, JAN 2011.
• Citações Web of Science: 20

Resumo

Based on the fact that streamwater quality reflects landscape conditions, the objectives of this study were: to investigate nitrogen (N), carbon (C), and major ion concentrations in six streams crossing minimally disturbed Atlantic Forest areas, with similar geomorphological characteristics; to determine N and C fluxes in one of these pristine streams (Indaia); and assess the impact of human activity on the biogeochemistry of two other streams in the same region, crossing urbanized areas. The distribution pattern of carbon and inorganic nitrogen dissolved forms, as well as the major ion and biogenic gas concentrations in the streamwater, was similar in pristine streams, indicating that the C and N dynamics were determined by influence of some factors, such as climate, atmospheric deposition, geology, soil type, and land covering, which were analogous in the forested watersheds. The urban streams were significantly different from the pristine streams, showing low dissolved oxygen concentrations, high respiration rates, and high concentrations of carbon dioxide, dissolved inorganic nitrogen, dissolved inorganic carbon, and major ion. These differences were attributed to anthropogenic impact on water quality, especially domestic sewage discharge. Additionally, in the Indaia stream, it was possible to observe the importance of rainfall over temporal dynamics of dissolved carbon forms, and also, the obtained specific flux of dissolved inorganic nitrogen was relatively elevated (approximately 11 kg ha(-1) year(-1)). These results reveal the influence of human activity over the biogeochemistry of coastal streams and also indicate the importance N export of Atlantic Forest to the ocean. (AU)

• Processo FAPESP: 05/57812-0 - Estudo espaço-temporal da distribuição das formas dissolvidas de nitrogênio e carbono em microbacias da Mata Atlântica com diferentes graus de perturbação
• Beneficiário: Tatiana Morgan Berteli de Andrade
• Linha de fomento: Bolsas no Brasil - Mestrado
• Processo FAPESP: 03/12595-7 - Composição florística, estrutura e funcionamento da Floresta Ombrófila Densa dos Núcleos Picinguaba e Santa Virgínia do Parque Estadual da Serra do Mar, estado de São Paulo, Brasil
• Beneficiário: Carlos Alfredo Joly
• Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Temático