Descripción
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Anthropogenic N deposition poses a threat to European Mediterranean ecosystems. We combined data from an extant N deposition gradient (4.3e7.3 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 b-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. | |
Internacional
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JCR del ISI
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Si |
Título de la revista
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Environmental Pollution |
ISSN
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0269-7491 |
Factor de impacto JCR
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3,73 |
Información de impacto
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Volumen
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DOI
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Número de revista
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179 |
Desde la página
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185 |
Hasta la página
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193 |
Mes
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SIN MES |
Ranking
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