Abstract
In the low mountains of the G.D.R. local damages of spruce ( Picea abies [L.] K arst .) due to immissions are to be found. In the classical immission regions of the Erzgebirge increased SO 2 concentrations result in damages of the assimilation system without alterations of the nutrient status being observed. On sites of the Thüringer Wald, the Harz and Erzgebirge, the spruce increasingly affected by a new type of forest damage, which is partially combined with SO 2 load in the Erzgebirge. This is basically due to loads by NO x and O 3 and photo-oxidants, resp., and accompanied by serious nutritional disturbances. The predominating symptoms of damage are caused by Mg deficiency and appear after the symptom limit having fallen below 0.035% Mg in the spruce needles, with lowering of Ca- and Zn-levels in the needles being associated. The extent of nutritional disturbances depends on the nutrient balance of the site.
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