Successional changes in soil nitrogen availability, non-symbiotic nitrogen fixation and carbon/nitrogen ratios in southern Chilean forest ecosystems

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dc.contributor.authorPérez, CA
dc.contributor.authorCarmona, MR
dc.contributor.authorAravena, JC
dc.contributor.authorArmesto, JJ
dc.date.accessioned2025-01-21T01:07:45Z
dc.date.available2025-01-21T01:07:45Z
dc.date.issued2004
dc.description.abstractVast areas of southern Chile are now covered by second-growth forests because of fire and logging. To study successional patterns after moderate-intensity, anthropogenic fire disturbance, we assessed differences in soil properties and N fluxes across a chronosequence of seven successional stands (2-130 years old). We examined current predictions of successional theory concerning changes in the N cycle in forest ecosystems. Seasonal fluctuations of net N mineralization (N-min) in surface soil and N availability (N-a; N-a=NH4+-N+NO3--N) in upper and deep soil horizons were positively correlated with monthly precipitation. In accordance with theoretical predictions, stand age was positively, but weakly related to both N-a (r(2)=0.282, P<0.001) and total N (N-tot; r(2)=0.192, P<0.01), and negatively related to soil C/N ratios (r(2)=0.187, P<0.01) in surface soils. A weak linear increase in soil N-min (upper plus deep soil horizons) was found across the chronosequence (r(2)=0.124, P<0.022). N-min occurred at modest rates in early successional stands, suggesting that soil disturbance did not impair microbial processes. The relationship between N fixation (N-fix) in the litter layer and stand age best fitted a quadratic model (r(2)=0.228, P<0.01). In contrast to documented successional trends for most temperate, tropical and Mediterranean forests, non-symbiotic N-fix in the litter layer is a steady N input to unpolluted southern temperate forests during mid and late succession, which may compensate for hydrological losses of organic N from old-growth ecosystems.
dc.fuente.origenWOS
dc.identifier.doi10.1007/s00442-004-1627-y
dc.identifier.eissn1432-1939
dc.identifier.issn0029-8549
dc.identifier.urihttps://doi.org/10.1007/s00442-004-1627-y
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96375
dc.identifier.wosidWOS:000223266500010
dc.issue.numero4
dc.language.isoen
dc.pagina.final625
dc.pagina.inicio617
dc.revistaOecologia
dc.rightsacceso restringido
dc.subjectnitrogen cycle
dc.subjectnet nitrogen mineralization
dc.subjectsouthern temperate forests
dc.subjectsecondary succession
dc.subject.ods02 Zero Hunger
dc.subject.ods13 Climate Action
dc.subject.ods15 Life on Land
dc.subject.ods14 Life Below Water
dc.subject.odspa02 Hambre cero
dc.subject.odspa13 Acción por el clima
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa14 Vida submarina
dc.titleSuccessional changes in soil nitrogen availability, non-symbiotic nitrogen fixation and carbon/nitrogen ratios in southern Chilean forest ecosystems
dc.typeartículo
dc.volumen140
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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