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Availability of 15N from pioneer herbaceous plants to pine seedlings in reclaimed burnt soils.

AutorGonzález Prieto, S. J.; Villar, M. C.; Carballas, T.
Fecha de publicación2008
EditorJohn Wiley & Sons
CitaciónRapid Communications in Mass Spectrometry 22: 2799-2802 (2008)
ResumenA pot experiment was used to assess the N uptake by pine seedlings during two years on a burnt soil added with 15N-labelled ryegrass, obtained from a 15N-enriched sample of this soil after the fire. Nitrogen concentration in needles, stems and roots of seedlings decreased significantly from the first to the second growing period (from 2.55, 1.30 and 2.19% to 1.19, 0.47 and 1.00%, respectively), needles accounting for 53-58% of pine-N. At the end of the experiment, 98.87 ± 1.12% of the added ryegrass-15N was recovered: two thirds in the soil organic N pool and one third in the pine seedlings. Therefore, the post fire pulse of inorganic N, which was successfully kept in the burnt soil-plant system through its uptake by the pioneer species, is available for trees at the medium term. Pine seedlings assimilated 16.4% and 16.9% of of added N uptake by plants; a possible explanation is the transient increase of available N in burnt soils that would have modified the mineralization pattern of the 15N-labelled phytomass. The pine N derived from the ryegrass-N decreased from 4.05% in the first year to 2.53% in the second one, being 3.10% the two-years weighed average. Besides the direct contribution of ryegrass to pine N nutrition reflected by these figures, the rapid post fire establishment of a herbaceous cover on the burnt soil also provides important indirect benefits for tree nutrition by reducing organic- and inorganic-N losses.
Versión del editorhttp://dx.doi.org/10.1002/rcm.3678
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