An assessment of nutrient sources and water quality improvement measures in Hornsea Mere

[摘要] Executive summary ? This report presents the work carried out during the 2nd year of the project (June 2009-June 2010). We report on the current status of the project, present provisional analysed data (using currently available data) and outline the work plan for July 2010 - May 2011. ? Twenty-eight out of the original planned 29 regional sites have been fully surveyed. The one remaining site (Halladale) has been excluded due to ongoing access permission difficulties. ? All outstanding identifications (lichens and bryophytes) will be completed by end of June 2010. ? Bark and branch pH��s will be completed by end of June 2010. ? As only 19 of the 28 regional sites had current NH3 monitoring, 9 additional sites were set up in August 2009 at sites without current NH3 monitoring. These additional sites will be monitored until August 2010 and are operated by local conservation and regulatory agency staff. ? Using combined tree species (Quercus and Betula) data, lichen species richness was found to be greater for branches compared to trunks. ? Eighty-six microlichen, 67 macrolichen and 11 bryophytes and liverworts species have been identified from the 21 regional sites examined to date. ? Bryophyte species richness (1-2 species) was significantly lower than that found for epiphytic lichens on both trunks and branches. ? There were significant differences (p

[发布机构] NERC/Centre for Ecology & Hydrology