title: Impacts of nitrogen deposition on herbaceous ground flora and epiphytic foliose lichen species in southern Ontario hardwood forests.
abstract: In this study 70 sugar maple (Acer saccharum Marsh.) dominated plots in Ontario, Canada were sampled in the spring of 2009 and 2010 and herbaceous plant and epiphytic foliose lichen species data were compared against modeled N and S deposition data, climate parameters and measured soil and plant/lichen S and N concentration. Herbaceous plant species richness was positively correlated with temperature and indices of diversity (Shannon Weiner and Simpson's Index) were positively correlated with soil pH but not N or S deposition or standardized foliar N scores. Herbaceous community composition was strongly controlled by traditional factors, but there was a small and significant influence of atmospheric S and N deposition. Epiphytic lichen species richness exhibited a strong negative relationship with standardized foliar N score and only one lichen species (Phaeophyscia rubropulchra) was observed at sites with a standardized foliar N score of 0.76.
authors.affiliation: Environmental and Life Science Program, Trent University, Peterborough, Ontario K9J 7B8, Canada. Electronic address: andrewmcdonough@trentu.ca.
authors.forename: Andrew M
authors.initials: AM
authors.lastname: McDonough
authors.affiliation: Environmental Resource Studies Program, Trent University, Peterborough, Ontario K9J 7B8, Canada.
authors.forename: Shaun A
authors.initials: SA
authors.lastname: Watmough
mesh_terms: D031002:Acer; D000393:Air Pollutants / Q000032:analysis*; D002170:Canada; D004784:Environmental Monitoring; D065928:Forests; D008011:Lichens / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis*; D009864:Ontario; D012987:Soil
chemical_list: D000393:Air Pollutants; D012987:Soil; D009584:Nitrogen
keywords: Climate; Epiphytic lichens; Forests; Nitrogen deposition; Ontario; Vegetation