By Ralf Conrad (auth.), Rainer Gasche, Hans Papen, Professor Heinz Rennenberg (eds.)

This quantity summarizes the present wisdom at the trade of hint gases among forests and the ambience with the restrict that solely carbon and nitrogen compounds are integrated. For this function the quantity brings jointly and interconnects wisdom from assorted disciplines of organic and atmospheric sciences. It covers microbial and plant tactics interested by the construction and intake of those hint gases; the alternate strategies among woodland soils and plants at the one hand, and the ambience nevertheless; the destiny of the hint gases exchanged contained in the surroundings in addition to environmental impacts at the alternate of hint gases among woodland ecosystems and the ambience. With this interdisciplinary strategy the amount offers the history for an evaluate of the alternate of hint gases among wooded area ecosystems and the ambience and man-made disturbances of this exchange.

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Trace Gas Exchange in Forest Ecosystems

This quantity summarizes the present wisdom at the trade of hint gases among forests and the ambience with the limit that solely carbon and nitrogen compounds are incorporated. For this function the quantity brings jointly and interconnects wisdom from assorted disciplines of organic and atmospheric sciences.

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03 Table 5. R. :! B ~ 8 ~:s Fitted equation; a*xI(b+x) Fitted parameters: a: -8:577 b: -170,3 9 6 •• 3 "0 = 0 U 0 0 25 50 75 Nitrogen dioxide concentration [nl 100 r'] Figure 1. Variation of conductance to leaf/needle surfaces in trees with increasing atmospheric concentrations ofN02 (data summarized from EPA 1991). g = 0 U 0 0 20 40 60 80 Nitric acid concentration [nl r'] Figure 2. Variation of conductance to leaf/needle surfaces in trees with increasing atmospheric concentrations of HN03 (data summarized from EPA 1991).

Nor is an enzyme that is characteristic for the denitrifying physiotype. Since NO is a compound that is potentially toxic to the cell, Nor is co-regulated with the NO-producing nitrite reductase and scavenges the NO when it is diffusing from the periplasm across the membrane into the cytoplasm. The affinity for NO is extremely high, so that the steady state concentration of NO is kept in the nanomolar range (Conrad 1996b). Knockout mutants of Nor are lethal. The high affinity of Nor to NO and its co-regulation with Nir may be the reason why NO production in soil is usually not due to the nitrate reduction processes but to ammonium oxidation (see above).

Variation of conductance to leaf/needle surfaces in trees with increasing atmospheric concentrations ofN02 (data summarized from EPA 1991). g = 0 U 0 0 20 40 60 80 Nitric acid concentration [nl r'] Figure 2. Variation of conductance to leaf/needle surfaces in trees with increasing atmospheric concentrations of HN03 (data summarized from EPA 1991). 2 N02, NO and HN03 uptake by trees 41 White Pine-o- '" ~ Norway Spruce_ Red Spruce - . - III C,) ~::s '" 'ta .!! 01 0 5 10 15 20 Nitric acid concentration [nl rl] Figure 3.

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