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agricultural soil science(3)
erosion(3)
land use(3)
loess(3)
china(2)
forests(2)
soil ecology(2)
agriculture waste(1)
agro-pastoral ecotone(1)
biogas potential(1)
carbon sequestration(1)
countermeasures(1)
drought variability(1)
ecosystems(1)
environmental behavior(1)
farmers'(1)
grasslands(1)
margins of the asian monsoon(1)
non-point source pollution(1)
particulates(1)
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