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agricultural soil science(49)
climate change(38)
forests(28)
soil ecology(21)
soil respiration(20)
carbon dioxide(19)
soil moisture(19)
biogeochemistry(17)
grasslands(17)
sediment(17)
soil chemistry(17)
fertilizers(16)
ecosystems(15)
erosion(15)
land use(15)
wetlands(15)
bacteria(14)
carbon sequestration(14)
soils(13)
agriculture(12)
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