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nitrate(65)
nitrogen(49)
carbon(18)
oxygen(17)
surface water(16)
chlorophyll(14)
biomass(12)
nutrients(12)
nitrite(11)
salinity(11)
sediments(11)
nitrous oxide(9)
ammonia(8)
emissions(8)
lakes(8)
oceans(8)
soils(8)
water quality(8)
isotopes(7)
phosphate(7)
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