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soils(202)
carbon(165)
soil moisture(76)
nitrogen(74)
organic carbon(71)
forests(69)
vegetation(66)
erosion(58)
precipitation(56)
soil respiration(54)
biomass(52)
carbon dioxide(49)
agriculture(48)
soil chemistry(48)
fertilizers(44)
organic matter(43)
soil temperature(34)
grasslands(33)
loess(33)
conservation(32)
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