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forests(12)
surface water(10)
runoff(9)
precipitation(7)
nitrogen(6)
vegetation(6)
water quality(6)
conservation(5)
landscape(5)
density(3)
grasslands(3)
soils(3)
agriculture(2)
carbon(2)
drainage(2)
erosion(2)
geochemistry(2)
invasive species(2)
irrigation(2)
isotopes(2)
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