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surface water(5)
biomass (ecology)(3)
water pollution(3)
wetlands(3)
acidification(2)
agricultural soil science(2)
biogeochemistry(2)
cyanobacteria(2)
eutrophication(2)
fertilizers(2)
grasslands(2)
lakes(2)
leaves(2)
nitrogen(2)
phytoplankton(2)
sediment(2)
accumulation rates(1)
agriculture(1)
air pollutant emissions(1)
air pollutants(1)
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