Document: JOS-3-33-3

Nutrient allocation in species from contrasting habitats following changes in nitrogen, phosphorous and CO2 .

ARENAS, J.M.* 1, A.GONI 1 and M.TERESA SEBASTIA 1,2

Centre Tecnologic Forestal de Catalunya. 25280 Solsona. Spain 1
Universitat de Lleida. 25198 Lleida. Spain 2

Abstract:
We studied the patterns of nutrient allocation of six co-ocurring species belonging to habitats with contrasted fertility to analyze the plastic responses following changes in nutrient availability and CO2. The species were: Trifolium repens, Nardus stricta and Dianthus hyssopifolius, from fertile mesic grasslands, and Globularia cordifolia, Sideritis hyssopifolia and Festuca gautieri, from infertile xeric grasslands. Half of the plants were grown under ambient (360 L/L) and half of the plant under double-ambient (700L/L) CO2 levels. Within each CO2 level, the plants were grown either with high nitrogen and high phosphorus, or low nitrogen and low phosphorus. Infertile habitat species allocated significantly more nutrients to roots than fertile habitat species for both resources, nutrients and CO2, except for nitrogen, where this effect was apparent only for the low nutrients treatment.

Keywords: Allometry, Nutrients, Carbon dioxide, Root, Shoot

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This abstract is being presented at: 3:30 PM in session:
Poster Session #15: Nutrient Cycling.