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agriculture(27)
forests(23)
carbon(20)
conservation(16)
grasslands(14)
vegetation(14)
organic carbon(12)
landscape(10)
erosion(9)
soils(9)
density(8)
loess(8)
organic matter(8)
deforestation(7)
irrigation(7)
biomass(6)
emissions(6)
degradation(5)
lakes(5)
nitrogen(5)
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