Seasonal and annual variations of phosphorus, calcium, potassium and manganese contents in different cross-sections of Picea abies (L.) Karst. needles and Quercus rubra L leaves exposed to elevated CO2

Effects of long-term CO 2 enrichment and nutrient availability in Norway spruce. II. Foliar chemistry

“…The less mobile -or immobile -nutrient elements Ca and Mn accumulated in the needles over the season (Table 1), and with increasing needle age (Table 3), which is in agreement with earlier reports on conifers (e.g. Tamm 1955;Helmisaari 1992;Nyman 1992;Le Thiec et al 1995;Linder 1995).…”

Ozone and water deficit reduced growth of Aleppo pine seedlings

“…Response of nutrient uptake and distribution within different tissues to O 3 exposure has been found to be variable depending on species and environmental conditions. In Norway spruce, Keller and Matyssek [22] reported increased concentrations of Ca, Mg and N. Le Thiec et al [24] found increased concentrations of K and Ca in the same species, but a decrease in the K content of the beech leaves after O 3 fumigation. On the other hand, Samuelson et al [32] found that O 3 exposure reduced foliar N concentrations and Fangmeier et al [12] did not detect any O 3 effect on the nutrient content in spring wheat.…”

Elevated CO2 and ozone reduce nitrogen acquisition by Pinus halepensis from its mycorrhizal symbiont

“…This suggests that, although allocating carbon to symbiotic processes, the CO 2 ‐exposed plants were not receiving a proportionate amount of N in return. The CO 2 ‐exposed pines had lower shoot N concentration, as is often observed in plant material exposed to elevated CO 2 (Norby et al 1992; Le Thiec et al 1995; Tissue et al 1996). Lower N concentrations could be linked with increased growth (Brown 1991).…”