Nutrient element and carbohydrate status of Norway spruce at Mt. Kleiner Feldberg in Taunus exposed to air pollution and soil acidification

摘要

AbstractA 17‐year‐old Norway‐spruce stand at Mt. Kleiner Feldberg (Taunus) was investigated. The mineral soil was found to be in the aluminum buffer range (pH H2O = 3.5) but the fine and very fine roots of injured and uninjured trees were sufficiently supplied with Ca and Mg. Mg‐deficiency, however, was observed in current‐year needles where the contents were 30 and 45 below standard values in uninjured and injured trees, respectively. In injured trees the severe Mg‐losses of current‐year needles coincided with a 20 to 60 loss of the activities of a number of enzymes involved in the carbohydrate metabolism and a significant reduction of the growth of curre