Temporal patterns of growth and nutrient accumulation of plant species in a Mediterranean mountainous grassland |
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Authors: | Andreas P Mamolos Charilaos V Vasilikos Demetrios S Veresoglou |
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Institution: | (1) Laboratory of Ecology and Environmental Protection (267), Faculty of Agriculture, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece |
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Abstract: | The temporal patterns of growth and nutrient accumulation into shoots of coexisting species were studied at two neighbouring
areas contrasting with respect to long-term water availability, in an upland herbaceous grassland. Plant growth limiting nutrients
were nitrogen (N) in the wet area, and N and phosphorus (P) in the dry area. A series of seven harvests allowed assessment
of temporal patterns of peaks for dry matter, N, P and potassium (K) accumulation into shoots and their respective rates of
accumulation. Additionally, “pairwise species’ proportion similarities” and “pairwise species’ overlaps” were estimated from
shoot biomass data. The peaks of N and P accumulation preceded those of K and dry matter accumulation. Similar trends were
evident for the respective rates of accumulation. Compared to the dry area, in the wet area there was a prolonged growing
period that increased the inter-species temporal variability in the rates of nutrient accumulation. Abundance of species was
correlated (negatively) to species N and P concentrations only in the dry area. It is argued that the significant negative
correlation between abundance and either N or P concentrations in the dry area was indicative of intensified inter-species
competition resulting from declined temporal complementarity. |
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Keywords: | |
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