Responses to ammonium and nitrate additions by boreal plants and their natural enemies
Separate effects of ammonium (NH 4 +) and nitrate (NO 3 −) on boreal forest understorey vegetation were investigated in an experiment where 12.5 and 50.0 kg nitrogen (N) ha −1 year −1 was added to 2 m 2 sized plots during 4 years. The dwarf-shrubs dominating the plant community, Vaccinium myrtillus...
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Veröffentlicht in: | Environmental pollution (1987) 2006-05, Vol.141 (1), p.167-174 |
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Sprache: | eng |
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Zusammenfassung: | Separate effects of ammonium (NH
4
+) and nitrate (NO
3
−) on boreal forest understorey vegetation were investigated in an experiment where 12.5 and 50.0
kg nitrogen (N) ha
−1 year
−1 was added to 2
m
2 sized plots during 4
years. The dwarf-shrubs dominating the plant community,
Vaccinium myrtillus and
V. vitis-idaea, took up little of the added N independent of the chemical form, and their growth did not respond to the N treatments. The grass
Deschampsia flexuosa increased from the N additions and most so in response to NO
3
−. Bryophytes took up predominately NH
4
+ and there was a negative correlation between moss N concentration and abundance. Plant pathogenic fungi increased from the N additions, but showed no differences in response to the two N forms. Because the relative contribution of NH
4
+ and NO
3
− to the total N deposition on a regional scale can vary substantially, the N load a habitat can sustain without substantial changes in the biota should be set considering specific vegetation responses to the predominant N form in deposition.
Biota will respond to nitrogen deposition depending on the form of nitrogen. |
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ISSN: | 0269-7491 1873-6424 |
DOI: | 10.1016/j.envpol.2005.08.017 |