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climate change(93)
nitrogen(87)
nitrogen deposition(56)
carbon dioxide(45)
ecosystems(40)
stable isotopes(40)
surface water(40)
fertilizers(39)
nitrous oxide(38)
biogeochemistry(36)
seasons(34)
forests(33)
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lakes(32)
nitrates(32)
agricultural soil science(31)
soil respiration(31)
leaves(27)
phosphorus(27)
carbon(26)
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