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population(4)
grasslands(3)
vegetation(3)
biomass(2)
conservation(2)
forests(2)
nitrogen(2)
precipitation(2)
carbon(1)
density(1)
elements(1)
erosion(1)
glaciation(1)
lead(1)
loess(1)
monsoons(1)
nutrients(1)
organic carbon(1)
oscillations(1)
rural areas(1)
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