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- W2081128213 abstract "Coniferous forests cover one-third of Bulgaria’s forest ecosystems and occupy 31% of the country’s total area. Forests in general are considered vulnerable to air pollutants in the form of dry and wet pollution deposition. The Bulgarian Govedartsi ecosystem study site, Ovnarsko No. 3, was established in 1991 to: (1) determine the existing status of remote forest site air quality; and (2) address potential air pollution problems related to coniferous forests. The site (1600 m) is located on the south slope of the Govedartsi Valley in the northwestern part of the Rila Mountain area. The Rila are the highest mountains (peak 2925 m) in the Balkan peninsula and are representative of rural forested conditions in that part of Europe. There are no anthropogenic air pollution sources for at least 30 km in all directions. The dominant tree species surrounding the study site include Scotch pine (Pinus sylvestris L.), Macedonia pine (Pinus peuce), black pine (Pinus nigra Arn.), Norway spruce (Picea abies Karst.), white fir (Abies alba Mill.), beech (Fagus sylvatica L.), and several oak species (i.e. Quercus petraea Liebl, Q. pubescens Willd., Q. conferta Kit., Q. cerris L., and Q. robur). Multi-day average ambient concentrations of nitrate and sulfate were measured using a filter-pack technique. Data for 27 multi-day periods between October 1991 and 1994 have been collected and 24 are reported in this study. Annual acidic aerosol dry deposition values are estimated at: 154 kg km−2 for sulfate (SO2−4) and 28 kg km−2 for nitrate (NO−3). Ozone (O3) concentrations were measured from late spring to summer in 1994 and 1995. No high O3 concentration episodes were detected, and maximum hourly O3 concentrations rarely exceeded 55 ppb." @default.
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- W2081128213 date "1997-12-01" @default.
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- W2081128213 title "Air Pollution Status of the Bulgarian Govedartsi Ecosystem" @default.
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- W2081128213 doi "https://doi.org/10.1016/s0269-7491(97)00144-9" @default.
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