Abstract
Abstract Four series of experiments were conducted to determine how pH affects the uptake of ions by spruce (Picea abies). Each series consisted of 12 plants growing in nutrient solutions with pHs of 3.0, 3.5, 4.0 and 5.0, respectively. The uptake of Rb, K and NH4 was studied. The uptake of Rb and NH4 in relation to the uptake of K was pH dependent, plants chose Rb and NH4 before K, the reason explained with the aid of a model including binding energy, hydration energy and the charge on the carrier. This model could explain other patterns of uptake of ions according to changing pH as long as the same carrier is used. Furthermore, our results indicate that coniferous trees growing on low pH soils in areas with a heavy N load from the atmosphere could risk shortage of K. Additional field studies are needed for verification.
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