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Please use this identifier to cite or link to this item: http://hdl.handle.net/10451/3924

Título: The strength of the biotic compartment to retain nitrogen additions prevents nitrogen losses from a Mediterranean maquis
Autor: Dias, T.
Martins-Loução, M. A.
Sheppard, L.
Cruz, C.
Issue Date: 9-Aug-2011
Citação: Biogeosciences Discuss., 8, 8041-8065, 2011
Resumo: Nitrogen (N) is one of the nutrients most limiting to ecosystem productivity. However, N availability is increasing globally, which may affect ecosystem functions and stability. To understand the role of each ecosystem compartment in the cycling of increased N, we studied the initial response of a nutrient-poor ecosystem, a Mediterranean maquis, to increased N. N availability (dose and forms) was modified by three N additions along the year (spring, summer and middle autumn/winter). Soil inorganic N pools (nitrate in particular) strongly reflected the N additions in autumn, almost matching the total N added along the three additions. Cistus ladanifer, the dominant plant species, responded to the increased N (cover and N concentration in leaves and litter), and given that leaf shedding occurs in the summer, the importance of this N pool returning to the soil through litter decomposition on the total soil inorganic N in autumn was investigated. Data suggest that living plants and litter have a crucial role in preventing N losses from Mediterranean maquis. This is the first integrated field study on how European Mediterranean ecosystems retain increased N of different forms and doses, however longer-term studies are needed to explore the generality of this study’s observations.
Arbitragem científica: yes
URI: http://hdl.handle.net/10451/3924
http://www.biogeosciences-discuss.net/8/8041/2011/doi:10.5194/bgd-8-8041-2011
ISSN: 1810-6277
Versão do Editor: http://www.biogeosciences-discuss.net/8/issue4.html
Appears in Collections:FC - Artigos em Revistas Internacionais

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