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eutrophication(10)
surface water(10)
nitrogen(5)
phosphorus(5)
lakes(4)
nutrients(4)
biomass(3)
wetlands(3)
absorption(2)
aquatic ecosystems(2)
carbon(2)
organic carbon(2)
agriculture(1)
carbon dioxide(1)
density(1)
ecosystem functions(1)
geochemistry(1)
grasslands(1)
heavy metals(1)
metals(1)
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