Effects of ozone and acid mist on saplings of fagus sylvatica : Air Pollution and Forest Decline. 14th International Meeting for Specialists in Air Pollution Effects on Forest Ecosystems

1989

S. 384-386

3 Abb., 4 Lit. Ang., En, Zfsg. En

Unselbständiges Werk

200034717

Fagus sylvatica sapling were exposed or 8 onths to three 03 exposure regimes in combination with mist at pH 4.8 or pH 3.5. Leaf fall was accelerated at high O3 concentrations and low mist pH and there was evidence of a synergistic interaction. Leaf dry weight after budburst in the subsequent season was reduced at high ozone (O3) concentrations, primarily due to a reduced leaf size, but stem dry weight was increased. Fagus sylvatica saplings were also exposed outdoors for 9 months to mist at six acidities ranging from pH 5.4 to pH 2.5. Shoot extension during the experiment was greatest at intermediate pH's; however, both leaf and root dry weight after budburst in the subsequent season reduced at intermediate pHs. Calcium content of these new leaves decreased linearly with decreasing mist pH. The results demonstrate that O3 and mist acidity may affect tree performance both immediately, and in seasons subsequent to exposure.