AI Article Synopsis
- This study reports the effects of ammonia and other nitrogen forms on Calluna plants on a bog since May 2002, revealing that ammonia exposure led to adverse conditions for the plants.
- Monthly ammonia levels reached 180-6 microg m(-3), which significantly enhanced nitrogen in the foliage but also caused increased susceptibility to drought, frost, and diseases.
- In contrast, Calluna plants receiving nitrogen from rainwater treatments showed no visible stress or significant increases in nitrogen levels, suggesting that different nitrogen sources have varying impacts on plant health.
Article Abstract
Effects and implications of reduced and oxidised N, applied under 'real world' conditions, since May 2002, are reported for Calluna growing on an ombrotrophic bog. Ammonia has been released from a 10 m line source generating monthly concentrations of 180-6 microg m(-3), while ammonium chloride and sodium nitrate are applied in rainwater at nitrate and ammonium concentrations below 4mM and providing up to 56 kg N ha(-1) year(-1) above a background deposition of 10 kg N ha(-1) year(-1). Ammonia concentrations, >8 microg m(-3) have significantly enhanced foliar N concentrations, increased sensitivity to drought, frost and winter desiccation, spring frost damage and increased the incidence of pathogen outbreaks. The mature Calluna bushes nearest the NH3 source have turned bleached and moribund. By comparison the Calluna receiving reduced and oxidised N in rain has shown no significant visible or stress related effects with no significant increase in N status.
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| http://dx.doi.org/10.1016/j.envpol.2007.10.040 | DOI Listing |
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