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carbon dioxide(25)
ecosystems(22)
grasslands(16)
agricultural soil science(15)
climate change(15)
forests(14)
china(13)
biomass (ecology)(11)
carbon sequestration(11)
rain(10)
seasons(10)
photosynthesis(9)
erosion(8)
forest ecology(8)
sediment(8)
surface water(8)
fertilizers(7)
leaves(7)
soil ecology(7)
trees(7)
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