Distribution of organic carbon(C) and total nitrogen(N) in different natural grassland,artificial Medicago stativa L.grassland with different growth years,Hippophae rhamnoides Linn.shrubland and farmland in Yunwu Mountain of the Loess Plateau were studied.Results show that the ranking of organic carbon and total nitrogen contents in four studied samples are: natural grassland>artificial grassland>shrubland>farmland.As soil depth increased,except in the 10~20 cm of nine-year artificial alfalfa grass...
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