Any change in nitrogen deposited to an ecosystem will cause a change in the nutrient

status of the system. It will cause biological consequences such as favouring nitrogenloving

species, eutrophication and in the most severe case, acidification. The

acidification is, in turn, linked to leakage of nitrates to ground and surface waters, as

the system cannot consume all the nitrogen deposited. Indirectly, O3 formed via NOx

emissions may also damage vegetation, crops, natural vegetation and forests.

The development of recommendations for limit values based on critical loads is

outside the scope of this paper. Limit values for NO2 and NOx will however have

implications for acidification and O3. These should be taken into account in assessing

the potential impact of the recommendations in this position paper. As mentioned

above, nitrogen deposition and its effects on the ecosystems are dealt with within the

UN ECE Task Force on Mapping and the mapping work lead by Co-ordinating Centre

for Effects at RIVM in the Netherlands. The outcome of this work will form one of

the main bases for the new nitrogen protocol. Effects of ozone are dealt with by

another working group.

 

 

 

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