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soil chemistry(46)
carbon(19)
soils(17)
forests(16)
nitrogen(15)
organic carbon(11)
fertilizers(8)
vegetation(8)
ph(7)
organic matter(6)
biomass(5)
soil ph(5)
degradation(4)
grasslands(4)
iron(4)
loess(4)
nutrients(4)
phosphorus(4)
precipitation(4)
soil fertility(4)
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