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globalchange

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carbon(9)
nitrogen(7)
forests(6)
loess(6)
erosion(5)
fertilizers(5)
biomass(4)
humidity(4)
organic carbon(4)
urban areas(4)
vegetation(4)
density(3)
lead(3)
population(3)
rural areas(3)
carbon dioxide(2)
degradation(2)
drought(2)
grasslands(2)
organic matter(2)
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