Radial increment in different tree heights in beech stands affected by air pollution

Abstract

Ring width eurves have been eonstructed from a sampIe of 12 trees from each of five beeeh stands in the munieipal forest of Wiesbaden. Ring width measurements in six different tree heights from four trees per stand are presented as profiles of inerement. Nine trees out of twenty showed similar profiles for the periods of 1925 to 1964 and 1965 to 1984, eight trees had a reduced inerement at the upper sampling heights in the seeond period. An influenee of air pollution on the form of inerement profiles eannot be proved nor excluded.