title: Heavy metals in soils near the nickel smelter: chemistry, spatial variation, and impacts on plant diversity.
abstract: Air pollution induced changes were observed both in plant communities and in soil chemistry in forest ecosystems near the nickel-copper smelter in the Kola Peninsula, Russia. All measured forest plant community parameters describing their floristic composition and structure were affected by pollution. Heavy metals were significantly concentrated in organic horizons of forest soils. The concentrations of ammonium acetate-extractable nickel and copper in organic horizons near the smelter were approximately two orders of magnitude higher than the background levels in the region. Based on pH values, air pollution has not resulted in a detectable topsoil acidification near the smelter. However, concentrations of extractable magnesium, potassium and nitrogen in organic horizons tended to be lower towards the smelter. The spatial variability of data obtained results in necessity of the two complementary, macroscopic and microscopic, approaches to ecosystem investigation. The macroscopic approach better revealed the influence of pollution. The ordination of the major species diversity indexes was highly related to soil properties, suggesting that the content of heavy metals and nutrients is the best soil related predictor of species diversity in polluted areas. Besides direct input of pollutants from the atmosphere, soil contamination and nutritional disturbance contribute significantly to the observed vegetation damage in subarctic forest ecosystems.
authors.affiliation: Physics Faculty, Moscow State University, Moscow 119892, Russia. koptsik@skop.phys.msu.su
authors.forename: S
authors.initials: S
authors.lastname: Koptsik
authors.forename: G
authors.initials: G
authors.lastname: Koptsik
authors.forename: S
authors.initials: S
authors.lastname: Livantsova
authors.forename: L
authors.initials: L
authors.lastname: Eruslankina
authors.forename: T
authors.initials: T
authors.lastname: Zhmelkova
authors.forename: Zh
authors.initials: Zh
authors.lastname: Vologdina
mesh_terms: D017753:Ecosystem; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D008669:Metallurgy; D019216:Metals, Heavy / Q000032:analysis*; D009532:Nickel; D010944:Plants; D011157:Population Dynamics; D012426:Russia; D012989:Soil Pollutants / Q000032:analysis*; D014197:Trees
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants; D009532:Nickel