Flow rates of ions in waters percolating through a model ecosystem with forest trees
From 1983-88 the long term effects of low level exposure with O(3), SO(2) and simulated acid rain on mineral cycling in model ecosystems with spruce, fir and beech seedlings were investigated. Systems consisting of open-top chambers built above lysimeters were protected against the intrusion of ambient rain and dust. The fluxes of elements with water input and output of the canopy and soil compartments were measured. Pronounced effects on canopy deposition and cation leaching were observed. Most noticeable were throughfall enrichment with sulphate through dry deposition of SO(2), influenced by duration of needlewetting and factors promoting SO(2) oxidation. Depending on sulphur deposition, leaching of calcium, magnesium, manganese, zinc and ammonium from canopies was elevated. After 15 months, the water percolating the soils in the lysimeters of these treatments was acidified, with elevated flowrates of sulphate, manganese, calcium and magnesium. The results on canopy/soil leaching are compared to those from old conifer stands in the field.
Bibliographic Reference: Article: Environmental Pollution, Vol. 68 (1990) pp. 231-252
Record Number: 199110309 / Last updated on: 1994-12-02
Original language: en
Available languages: en