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forests(52)
carbon(20)
soil chemistry(15)
soils(14)
nitrogen(13)
vegetation(12)
erosion(10)
organic carbon(10)
agriculture(9)
soil respiration(9)
conservation(8)
carbon dioxide(7)
organic matter(6)
grasslands(5)
soil temperature(5)
biomass(4)
calcium(4)
deforestation(4)
ph(4)
soil erosion(4)
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