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forests(55)
agriculture(32)
agricultural soil science(28)
land use(23)
forest ecology(18)
conservation science(14)
biodiversity(12)
erosion(9)
ecosystems(8)
wetlands(8)
carbon sequestration(7)
agricultural land(6)
grasslands(6)
soil ecology(6)
trees(6)
climate change(5)
habitats(5)
soil chemistry(5)
carbon dioxide(4)
population density(4)
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