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Authordc.contributor.authorPérez, Cecilia 
Authordc.contributor.authorThomas, Frank 
Authordc.contributor.authorSilva, Wladimir 
Authordc.contributor.authorAguilera, Rodrigo 
Authordc.contributor.authorArmesto, Juan J. 
Cita de ítemdc.identifier.citationBiogeochemistry (2017) 132:23–36es_ES
Abstractdc.description.abstractBiological nitrogen fixation is a key ecosystem function incorporating new nitrogen (N) during primary successions. Increasing evidence from tropical and northern temperate forests shows that phosphorus (P) and molybdenum (Mo) either alone or in combination limit the activity of free-living diazotrophs. In this study, we evaluated the effects of Mo, P, and carbon (C) addition, either singly or in combination, and moisture, on diazotrophic activity in a post-volcanic forest chronosequence in south-fentral Chile. Diazotrophic activity, both free-living (associated with fine litter) and symbiotic (associated with the moss Racomitrium lanuginosum and the cyanolichens Pseudocyphellaria berberina and P. coriifolia), was evaluated by incubation of samples and subsequent acetylene reduction assays conducted in the field and laboratory, in winter, spring and autumn of two consecutive years. Results showed that diazotrophic activity varied with the season of the year (lowest during the drier spring season), successional stage (highest in the maximal stage), and N-fixer community type (highest in symbiotic diazotrophs). In general, C+P+Mo limitation was documented for heterotrophic diazotrophs and P+Mo limitation for symbiotic diazotrophs. Limitation of diazotrophic activity was not associated with soil nutrient and C status in the chronosequence. Strong inhibition of diazotrophic activity by high N addition and by low moisture suggests that reductions in precipitation expected for south-central Chile under climate change, as well as increasing inputs of reactive N from atmospheric deposition due to increasing use of N fertilizers, may drastically alter the composition and functional role of cryptogamic assemblages in native forestses_ES
Patrocinadordc.description.sponsorshipFondo Nacional de Ciencia y Tecnologia (Fondecyt) 1130353 IAI-CRN 3005 Conicyt PFB-23 Millennium Scientific Initiative P05-002es_ES
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
Link to Licensedc.rights.uri*
Keywordsdc.subjectFree-living diazotrophses_ES
Keywordsdc.subjectSymbiotic diazotrophses_ES
Keywordsdc.subjectC plus P plus Mo limitationes_ES
Keywordsdc.subjectSouthern temperate forestses_ES
Títulodc.titleBiological nitrogen fixation in a post-volcanic chronosequence from south-central Chilees_ES
Document typedc.typeArtículo de revista
Indexationuchile.indexArtículo de publicación ISIes_ES
Indexationuchile.indexArtículo de publicación SCOPUSes_ES

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Attribution-NonCommercial-NoDerivs 3.0 Chile
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Chile