Impact Type: Deposition of pollutant
Irish Lady's tresses (Spiranthes romanzoffiana) is a rare orchid of boggy pastures and meadows which occurs particularly in Northern Ireland, the extreme west of Scotland and at one site in England in south Devon (Biodiversity Steering Group 1995). This UK BAP species has declined in intensive agricultural areas, probably due to eutrophication and habitat loss. Atmospheric N deposition is expected to be a contributing factor since it will increase competition from grasses and tall forbs.
There is no published research on the impact of pollution on this species.
|Habitat/ Ecosystem Type||Eunis Code||Critical Load/ Level||Status||Reliability||Indication of exceedance||Reference|
|Non-mediterranean dry acid and neutral closed grassland||E1.7||
10-15 kg N ha-1 year-1
|UNECE 2010 - Noordwijkerhout workshop||reliable||
Increase in graminoids, decline of typical species, decrease in total species richness.