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precipitation(5)
carbon(4)
grasslands(4)
organic carbon(4)
density(3)
humidity(3)
sediments(3)
surface water(3)
conservation(2)
erosion(2)
forests(2)
metals(2)
nitrogen(2)
ph(2)
population(2)
vegetation(2)
wetlands(2)
active layer(1)
atmospheric temperature(1)
biomass(1)
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