Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response

Calvete Sogo, Hector; Elvira, S.; Sanz, Javier; González-Fernández, I.; García Gómez, Hector; Sánchez Martín, Laura; Alonso, R. y Bermejo, V. (2014). Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response. "Atmospheric Environment", v. 95 ; pp. 197-206. ISSN 1352-2310. https://doi.org/10.1016/j.atmosenv.2014.05.073.

Descripción

Título: Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response
Autor/es:
  • Calvete Sogo, Hector
  • Elvira, S.
  • Sanz, Javier
  • González-Fernández, I.
  • García Gómez, Hector
  • Sánchez Martín, Laura
  • Alonso, R.
  • Bermejo, V.
Tipo de Documento: Artículo
Título de Revista/Publicación: Atmospheric Environment
Fecha: 2014
Volumen: 95
Materias:
Escuela: E.U.I.T. Agrícolas (UPM)
Departamento: Química y Tecnología de Alimentos
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Pastures are among the most important ecosystems in Europe considering their biodiversity and dis- tribution area. However, their response to increasing tropospheric ozone (O 3 ) and nitrogen (N) deposi- tion, two of the main drivers of global change, is still uncertain. A new Open-Top Chamber (OTC) experiment was performed in central Spain, aiming to study annual pasture response to O 3 and N in close to natural growing conditions. A mixture of six species of three representative families was sowed in the fi eld. Plants were exposed for 40 days to four O 3 treatments: fi ltered air, non- fi ltered air (NFA) repro- ducing ambient levels and NFA supplemented with 20 and 40 nl l � 1 O 3 . Three N treatments were considered to reach the N integrated doses of “ background ” , þ 20 or þ 40 kg N ha � 1 . Ozone signi fi cantly reduced green and total aboveground biomass (maximum reduction 25%) and increased the senescent biomass (maximum increase 40%). Accordingly, O 3 decreased community Gross Primary Production due to both a global reduction of ecosystem CO 2 exchange and an increase of ecosystem respiration. Nitrogen could partially counterbalance O 3 effects on aboveground biomass when the levels of O 3 were moderate, but at the same time O 3 exposure reduced the fertilization effect of higher N availability. Therefore, O 3 must be considered as a stress factor for annual pastures in the Mediterranean areas.

Más información

ID de Registro: 35158
Identificador DC: http://oa.upm.es/35158/
Identificador OAI: oai:oa.upm.es:35158
Identificador DOI: 10.1016/j.atmosenv.2014.05.073
Depositado por: Memoria Investigacion
Depositado el: 30 Sep 2015 10:25
Ultima Modificación: 01 Nov 2016 23:30
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