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  • Cited by 24
  • Print publication year: 2011
  • Online publication date: May 2011

20 - Nitrogen as a threat to European terrestrial biodiversity

from Part IV - Managing nitrogen in relation to key societal threats

Summary

Executive summary

Nature of the problem

Biodiversity is the variability among living organisms, from genes to the biosphere. The value of biodiversity is multifold, from preserving the integrity of the biosphere as a whole, to providing food and medicines, to spiritual and aesthetic well-being.

One of the major drivers of biodiversity loss in Europe is atmospheric deposition of reactive nitrogen (Nr).

Approaches

This chapter focuses on Nr impacts on European plant species diversity; in particular, the number and abundance of different species in a given area, and the presence of characteristic species of sensitive ecosystems.

We summarise both the scientific and the policy aspects of Nr impacts on diversity and identify, using a range of evidence, the most vulnerable ecosystems and regions in Europe.

Key findings/state of knowledge

Reactive nitrogen impacts vegetation diversity through direct foliar damage, eutrophication, acidification, and susceptibility to secondary stress.

Species and communities most sensitive to chronically elevated Nr deposition are those that are adapted to low nutrient levels, or are poorly buffered against acidification. Grassland, heathland, peatland, forest, and arctic/montane ecosystems are recognised as vulnerable habitats in Europe; other habitats may be vulnerable but are still poorly studied.

It is not yet clear if different wet-deposited forms of Nr (e.g. nitrate, NO3 versus ammonium, NH4+) have different effects on biodiversity. However, gaseous ammonia (NH3) can be particularly harmful to vegetation, especially lower plants, through direct foliar damage.

[…]

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