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carbon(34)
nitrogen(21)
biomass(16)
acid deposition(15)
organic matter(14)
lakes(13)
ph(13)
organic carbon(12)
carbon dioxide(11)
phosphorus(10)
oxygen(9)
soils(8)
absorption(6)
nitrate(6)
nutrients(6)
sulfur(6)
ammonia(5)
calcium(5)
degradation(5)
ions(5)
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