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population(6)
nitrogen(5)
precipitation(4)
carbon(3)
conservation(3)
surface water(3)
biomass(2)
fertilizers(2)
forests(2)
grasslands(2)
lakes(2)
mortality(2)
nitrate(2)
ph(2)
phosphorus(2)
public health(2)
soils(2)
vegetation(2)
altitude(1)
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