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biomass(2)
surface water(2)
ammonia(1)
carbon(1)
carbon dioxide(1)
conductivity(1)
drainage(1)
drought(1)
electrical conductivity(1)
erosion(1)
grasslands(1)
heavy metals(1)
lakes(1)
metals(1)
nitrogen(1)
oscillations(1)
oxygen(1)
ph(1)
population(1)
potassium(1)
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