eprintid: 25901 rev_number: 23 eprint_status: archive userid: 1903 dir: disk0/00/02/59/01 datestamp: 2014-06-18 15:20:57 lastmod: 2015-08-31 22:56:03 status_changed: 2014-06-18 15:20:57 type: article metadata_visibility: show item_issues_count: 0 creators_name: Ochoa Hueso, Raúl creators_name: Maestre, Fernando T. creators_name: Rios, Asuncion de los creators_name: Valea, Sergio creators_name: Theobald, Mark Richard creators_name: Vivanco, Marta G. creators_name: Manrique, Esteban creators_name: Bowker, Mathew A. title: Nitrogen deposition alters nitrogen cycling and reduces soil carbon content in low-productivity semiarid Mediterranean ecosystems. rights: by-nc-nd ispublished: pub subjects: quimica full_text_status: public abstract: Anthropogenic N deposition poses a threat to European Mediterranean ecosystems. We combined data from an extant N deposition gradient (4.3–7.3 kg N ha−1 yr−1) from semiarid areas of Spain and a field experiment in central Spain to evaluate N deposition effects on soil fertility, function and cyanobacteria community. Soil organic N did not increase along the extant gradient. Nitrogen fixation decreased along existing and experimental N deposition gradients, a result possibly related to compositional shifts in soil cyanobacteria community. Net ammonification and nitrification (which dominated N-mineralization) were reduced and increased, respectively, by N fertilization, suggesting alterations in the N cycle. Soil organic C content, C:N ratios and the activity of β-glucosidase decreased along the extant gradient in most locations. Our results suggest that semiarid soils in low-productivity sites are unable to store additional N inputs, and that are also unable to mitigate increasing C emissions when experiencing increased N deposition. date_type: published date: 2013-08 publication: Environmental Pollution number: 179 pagerange: 185-193 id_number: 10.1016/j.envpol.2013.03.060 institution: Agronomos department: Quimica_Analisis refereed: TRUE issn: 0269-7491 official_url: http://www.sciencedirect.com/science/article/pii/S0269749113001930 citation: Ochoa Hueso, Raúl and Maestre, Fernando T. and Rios, Asuncion de los and Valea, Sergio and Theobald, Mark Richard and Vivanco, Marta G. and Manrique, Esteban and Bowker, Mathew A. (2013). Nitrogen deposition alters nitrogen cycling and reduces soil carbon content in low-productivity semiarid Mediterranean ecosystems.. "Environmental Pollution" (n. 179); pp. 185-193. ISSN 0269-7491. https://doi.org/10.1016/j.envpol.2013.03.060 . document_url: https://oa.upm.es/25901/1/INVE_MEM_2013_160948.pdf