Chemistry

Changes of Atmospheric Chemistry and Effects on Forest by Reinhard F. Hüttl, K. Bellmann

By Reinhard F. Hüttl, K. Bellmann

This quantity summarises the results of an interdisciplinary study programme entitled `Rehabilitation of the ambience of the hot States of Germany - results on Terrestrial Ecosystems'. sooner than the unification of Germany, emission a great deal of SO2 and mud debris have been as much as 18-fold better in East than in West Germany. although, emission premiums have reduced considerably in view that reunification in 1990, a result of breakdown of a big variety of commercial and especially lignite- fired powerplants and the implementation of fresh air applied sciences. on the way to research the consequences of those dramatic alterations in atmospheric chemistry on terrestrial ecosystems, accomplished box reports have been performed in pine woodland ecosystems alongside an old gradient of atmospheric deposition charges within the northeastern lowlands of Germany. the quick and dramatic relief of dirt particle and SO2 emissions deals a special chance to check the position of SO2 and alkaline particle deposition in regards to alterations or harm to wooded area ecosystems and even if the woodland stands go back to a nation of resilience. during this admire, this atmosphere scan will be seemed upon as a roof test with out a roof.

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Only the Cu supply of the Neuglobsow experimental site temporarily approached the deficiency threshold level. The Cd and Pb contents of the (unwashed) needles indicate a higher needle age dependent accumulation of these elements near the industrialized areas (Rosa, Taura). The absolute needle contents of these elements, however, do not exceed critical levels. The course the trace elements took during the time of observation renders no indication for disharmonic or deficient supply. Only the Cu supply of the Neuglobsow experimental site temporarily approached the deficiency threshold level.

Needle necroses as sum (mean values ± standard errors) of previous and current year's pine needles and total chlorophyll content of current year's pine needles. Significance was determined according to the Mann-Whitney U-test. 99±0. c o a. ) Figure 4. Correlation between the sulphate sulphur contents in current year's pine needles and in humus layers at the three field sites in 1993 and 1995 4. Discussion Comparison of the measured sulphur dioxide (S02) and nitrogen oxide (NO x = NO + N0 2) concentrations in the ambient air near Scots pine forests located in (N)euglobsow, (T)aura and (R)osa (Table 1) with the determined sol--s (Table 2, Figure 2) and NPN (Table 3, Figure 3) contents in current year's needles confirmed the accuracy of the presented results of this long-term study under field conditions between 1991- 1995.

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