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    Título
    Time- and age-related effects of experimentally simulated nitrogen deposition on the functioning of montane heathland ecosystems
    Autor
    Calvo Fernández, Javier
    Taboada Palomares, ÁngelaAutoridad BuleriaORCID
    Fichtner, Andreas
    Härdtle, Werner
    Calvo Galván, María LeonorAutoridad BuleriaORCID
    Marcos Porras, Elena MaríaAutoridad BuleriaORCID
    Facultad/Centro
    Facultad de Ciencias Biologicas y Ambientales
    Área de conocimiento
    Ecologia
    Datos de la obra
    Science of the total environment, 2017, vol. 613-614
    Editor
    Elsevier
    Fecha
    2017
    Abstract
    Ecosystems adapted to low nitrogen (N) conditions such as Calluna-heathlands are especially sensitive to enhanced atmospheric N deposition that affects many aspects of ecosystem functioning like nutrient cycling, soil properties and plant-microbial-enzyme relationships. We investigated the effects of five levels of experimentally- simulated N deposition rates (i.e., N fertilization treatments: 0, 10, 20 and 50 kg N ha− 1 yr− 1 for 3 years, and 56 kg N ha− 1 yr− 1 for 10 years) on: plant, litter, microbial biomass and soil nutrient contents, soil extracellular enzymatic activities, and plant root ericoid mycorrhizal colonization. The study was conducted in marginal montane Calluna-heathlands at different developmental stages resulting from management (young/building-phase and mature-phase). Our findings revealed that many soil properties did not show a statistically significant response to the experimental addition of N, including: total N, organic carbon (C), C:N ratio, extractable N-NO3 −, available phosphorus (P), urease and β-glucosidase enzyme activities, and microbial biomass C and N. Our results also evidenced a considerable positive impact of chronic (10-year) high-N loading on soil extractable N-NH4 +, acid phosphatase enzyme activity, Calluna root mycorrhizal colonization by ericoid fungi, Calluna shoot N and P contents, and litter N content and N:P ratio. The age of heathland vegetation influenced the effects of N addition on ericoid mycorrhizal colonization, resulting in higher colonized roots in young heathlands at the control, low and medium N-input rates; and in mature ones at the high and chronically high N rates. Also, young heathlands exhibited greater soil extractable N-NO3 −, available P, microbial biomass N, Calluna shoot N and P contents, and litter N content, compared to mature ones. Our results highlighted that accounting for the N-input load and duration, as well as the developmental stage of the vegetation, is important for assessing the effects of added N, particularly at the heathlands' southern distribution limit.
    Materia
    Ecología. Medio ambiente
    Palabras clave
    Air pollution
    Calluna vulgaris heathland
    Plant-litter-soil nutrient relationship
    Extracellular enzymatic activity
    Soil microbial biomass
    Ericoid mycorrhizal colonization
    Peer review
    SI
    URI
    http://hdl.handle.net/10612/7422
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