Soil-atmosphere exchange of nitrous oxide, methane and carbon dioxide in a gradient of elevation in the coastal Brazilian Atlantic forest

Autor(es):Mostrar menos -

Sousa Neto, E. ^[1] ; Carmo, J. B. ^[2] ; Keller, M. ^[3] ; Martins, S. C. ^[1] ; Alves, L. F. ^{[4, 5]} ; Vieira, S. A. ^[1] ; Piccolo, M. C. ^[1] ; Camargo, P. ^[1] ; Couto, H. T. Z. ^[6] ; Joly, C. A. ^[7] ; Martinelli, L. A. ^[1]

Afiliação do(s) autor(es)

^[1] CENA USP, Ctr Energia Nucl Agr, Lab Ecol Isotop, Sao Paulo - Brazil

^[2] Univ Fed Sao Carlos, Sao Paulo - Brazil

^[3] US Forest Serv, Int Inst Trop Forestry, USDA, San Juan, PR - USA

^[4] Univ Colorado, INSTAAR, Boulder, CO 80309 - USA

^[5] Inst Bot, Secao Ecol, Sao Paulo - Brazil

^[6] ESALQ USP, Escola Super Agr Luiz de Queiroz, Sao Paulo - Brazil

^[7] Univ Estadual Campinas, Dept Biol Vegetal IB UNICAMP, BR-13081970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BIOGEOSCIENCES; v. 8, n. 3, p. 733-742, 2011.
• Citações Web of Science: 44

Resumo

Soils of tropical forests are important to the global budgets of greenhouse gases. The Brazilian Atlantic Forest is the second largest tropical moist forest area of South America, after the vast Amazonian domain. This study aimed to investigate the emissions of nitrous oxide (N(2)O), carbon dioxide (CO(2)) and methane (CH(4)) fluxes along an altitudinal transect and the relation between these fluxes and other climatic, edaphic and biological variables (temperature, fine roots, litterfall, and soil moisture). Annual means of N(2)O flux were 3.9 (+/- 0.4), 1.0 (+/- 0.1), and 0.9 (+/- 0.2) ng N cm(-2) h(-1) at altitudes 100, 400, and 1000 m, respectively. On an annual basis, soils consumed CH(4) at all altitudes with annual means of -1.0 (+/- 0.2), -1.8 (+/- 0.3), and -1.6 (+/- 0.1) mg m(-2) d(-1) at 100 m, 400 m and 1000 m, respectively. Estimated mean annual fluxes of CO(2) were 3.5, 3.6, and 3.4 mu mol m(-2) s(-1) at altitudes 100, 400 and 1000 m, respectively. N(2)O fluxes were significantly influenced by soil moisture and temperature. Soil-atmosphere exchange of CH(4) responded to changes in soil moisture. Carbon dioxide emissions were strongly influenced by soil temperature. While the temperature gradient observed at our sites is only an imperfect proxy for climatic warming, our results suggest that an increase in air and soil temperatures may result in increases in decomposition rates and gross inorganic nitrogen fluxes that could support consequent increases in soil N(2)O and CO(2) emissions and soil CH(4) consumption. (AU)

• Processo FAPESP: 05/57549-8 - Perdas de nitrogênio pela emissão de gases e sua relação com a decomposição da liteira e biomassa de raízes na floresta de Mata Atlântica
• Beneficiário: Eráclito Rodrigues de Sousa Neto
• Modalidade de apoio: 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
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático