Biogeochemical indicators of elevated nitrogen deposition in semiarid Mediterranean ecosystems

Ochoa Hueso, Raúl; Arróniz Crespo, María; Bowker, Mathew A.; Maestre, Fernando T.; Pérez Corona, M. Esther; Theobald, Mark Richard; Vivanco, Marta G. y Manrique, Esteban (2014). Biogeochemical indicators of elevated nitrogen deposition in semiarid Mediterranean ecosystems. "Environmental Monitoring And Assessment", v. 186 (n. 9); pp. 5831-5842. ISSN 0167-6369.

Descripción

Título: Biogeochemical indicators of elevated nitrogen deposition in semiarid Mediterranean ecosystems
Autor/es:
  • Ochoa Hueso, Raúl
  • Arróniz Crespo, María
  • Bowker, Mathew A.
  • Maestre, Fernando T.
  • Pérez Corona, M. Esther
  • Theobald, Mark Richard
  • Vivanco, Marta G.
  • Manrique, Esteban
Tipo de Documento: Artículo
Título de Revista/Publicación: Environmental Monitoring And Assessment
Fecha: Septiembre 2014
Volumen: 186
Materias:
Escuela: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Departamento: Química y Tecnología de Alimentos
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Nitrogen (N) deposition has doubled the natural N inputs received by ecosystems through biological N fixation and is currently a global problem that is affecting the Mediterranean regions. We evaluated the existing relationships between increased atmospheric N deposition and biogeochemical indicators related to soil chemical factors and cryptogam species across semiarid central, southern, and eastern Spain. The cryptogam species studied were the biocrust-forming species Pleurochaete squarrosa (moss) and Cladonia foliacea (lichen). Sampling sites were chosen in Quercus coccifera (kermes oak) shrublands and Pinus halepensis (Aleppo pine) forests to cover a range of inorganic N deposition representative of the levels found in the Iberian Peninsula (between 4.4 and 8.1 kg N ha(-1) year(-1)). We extended the ambient N deposition gradient by including experimental plots to which N had been added for 3 years at rates of 10, 20, and 50 kg N ha(-1) year(-1). Overall, N deposition (extant plus simulated) increased soil inorganic N availability and caused soil acidification. Nitrogen deposition increased phosphomonoesterase (PME) enzyme activity and PME/nitrate reductase (NR) ratio in both species, whereas the NR activity was reduced only in the moss. Responses of PME and NR activities were attributed to an induced N to phosphorus imbalance and to N saturation, respectively. When only considering the ambient N deposition, soil organic C and N contents were positively related to N deposition, a response driven by pine forests. The PME/NR ratios of the moss were better predictors of N deposition rates than PME or NR activities alone in shrublands, whereas no correlation between N deposition and the lichen physiology was observed. We conclude that integrative physiological measurements, such as PME/NR ratios, measured on sensitive species such as P. squarrosa, can provide useful data for national-scale biomonitoring programs, whereas soil acidification and soil C and N storage could be useful as additional corroborating ecosystem indicators of chronic N pollution.

Más información

ID de Registro: 36106
Identificador DC: http://oa.upm.es/36106/
Identificador OAI: oai:oa.upm.es:36106
URL Oficial: http://link.springer.com/article/10.1007/s10661-014-3822-6
Depositado por: Memoria Investigacion
Depositado el: 01 Jul 2015 16:57
Ultima Modificación: 30 Sep 2015 22:56
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