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Fog precipitation and rainfall interception in the natural forests of Madeira Island (Portugal)
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Orientador(es)
Resumo(s)
Situated in the Atlantic Ocean, Madeira is a within-plate volcanic island, approximately 600 km
northwest of the Western African coast. Cloud cover formed mainly of orographic origin persists on
Madeira for more than 200 days per year between 800 m and 1600 m altitude. Since vegetation occupies
2/3 of the island’s surface, fog precipitation, which occurs when fog droplets are filtered by the forest
canopy and coalesce on the vegetation surfaces to form larger droplets that drip to the forest floor, is an
important hydrological input. Rainfall interception and fog precipitation data were collected between
1996 and 2005 in the natural forests of Madeira. Six throughfall gauges were placed under the canopy of
three different types of forest: high altitude tree heath forest (1580 m), secondary tree heath forest
(1385 m) and humid laurisilva forest (1050 m). Fog precipitation is higher under high altitude heath
forest (average canopy interception was 225% of gross precipitation) and dependent both on altitude
and vegetation type, due to different tree architecture and leaf shape. Although results are conservative
estimates of fog precipitation, they point towards the importance of fog-water as a source of
groundwater recharge in the water balance of the main forest ecosystems of Madeira.
Descrição
Palavras-chave
Fog precipitation Interception High altitude heath tree forest Secondary heath tree forest Humid laurisilva forest Madeira Island (Portugal) . Faculdade de Ciências da Vida
Contexto Educativo
Citação
Prada, S., Sequeira, M. M., Figueira, C., & da Silva, M. O. (2009). Fog precipitation and rainfall interception in the natural forests of Madeira Island (Portugal). Agricultural and Forest Meteorology, 149(6-7), 1179-1187. https://doi.org/10.1016/j.agrformet.2009.02.010
Editora
Elsevier