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Título

Differential Nitrogen Cycling in Semiarid Sub-Shrubs with Contrasting Leaf Habit

Autor Palacio, Sara ; Maestro Martínez, Melchor ; Montserrat-Martí, Gabriel
Fecha de publicación 27-mar-2014
EditorPublic Library of Science
Citación PLoS ONE 9(3): e93184 (2014)
ResumenNitrogen (N) is, after water, the most limiting resource in semiarid ecosystems. However, knowledge on the N cycling ability of semiarid woody plants is still very rudimentary. This study analyzed the seasonal change in the N concentrations and pools of the leaves and woody organs of two species of semiarid sub-shrubs with contrasting leaf habit. The ability of both species to uptake, remobilize and recycle N, plus the main storage organ for N during summer drought were evaluated. We combined an observational approach in the field with experimental 15N labelling of adult individuals grown in sand culture. Seasonal patterns of N concentrations were different between species and organs and foliar N concentrations of the summer deciduous Lepidium subulatum were almost double those of the evergreen Linum suffruticosum. L. subulatum up took ca. 60% more external N than the evergreen and it also had a higher N resorption efficiency and proficiency. Contrastingly, L. suffruticosum relied more on internal N remobilization for shoot growth. Differently to temperate species, the evergreen stored N preferentially in the main stem and old trunks, while the summer deciduous stored it in the foliage and young stems. The higher ability of L. subulatum to uptake external N can be related to its ability to perform opportunistic growth and exploit the sporadic pulses of N typical of semiarid ecosystems. Such ability may also explain its high foliar N concentrations and its preferential storage of N in leaves and young stems. Finally, L. suffruticosum had a lower ability to recycle N during leaf senescence. These strategies contrast with those of evergreen and deciduous species from temperate and boreal areas, highlighting the need of further studies on semiarid and arid plants.
Descripción 9 páginas, 5 tablas, 4 figuras.
Versión del editorhttp://dx.doi.org/10.1371/journal.pone.0093184.s002
URI http://hdl.handle.net/10261/94707
DOI10.1371/journal.pone.0093184
ISSN1932-6203
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