Forest Ecosystem Development After Heavy
Deposition Loads – Case Study Dübener Heide
Author(s)
C. Fürst, M. Abiy & F. Makeschin
Abstract
Forest ecosystems in the New Lander (Germany) were impacted for more than
one century by industrial emissions. The deposition amount has decreased since
the middle of the 1980s due to technological progress and closing of main
emitters. In the research project ENFORCHANGE (www.enforchange.de), the
impact of past industrial depositions on forest ecosystems is assessed in two
model regions, and approaches how to integrate deposition residuals into forest
management are developed. The here presented model region Dübener Heide is a
ca. 300 km² large forest area in the industrial triangle Leipzig-Halle-Bitterfeld,
which is one of the most polluted regions in the New Lander. A total deposition
amount of 18 Mio t fly ash and of 12 Mio t SO2 led to considerable changes of
site properties, forest growth and health. The actual investigations in Dübener
Heide revealed that the historical deposition impact still results in a spatial
differentiation of forest growth conditions: nowadays, Dübener Heide can be
divided into two parts with different impact level and intensity. Verifiable fly ash
influence with high pH values and nutrient potential is limited to a zone of
maximally 8–15 km distance to the former emitters, whereas SO2 impacted the
total 300 km² area, but its effects are no longer detectable. This spatial
differentiation is relevant for tree species choice in the future: the heavily fly ash
impacted sites are characterized by ample regeneration and growth of noble
hardwood species and European beech, whereas the not measurably fly ash
influenced sites are more or less suitable for Scots Pine and Oak. The prediction
of the long-term development of the site potential and tree species suitability on
heavily fly ash affected sites under different climate change scenarios are part of
ongoing studies.
Keywords: forest ecosystem development, fly ash deposition, SO2 deposition,
forest growth and health, site potential, forest management planning.
Keywords
forest ecosystem development, fly ash deposition, SO2 deposition,forest growth and health, site potential, forest management planning.
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