Effects of Land-Use Dynamics on Soil Organic Carbon and Total Nitrogen Stock, Western Ethiopia

Table 5

The mean annual absolute rate of change in soil organic carbon, total nitrogen content and stock, and C : N ratio under different land uses.

Land-use types	Year	The mean annual absolute rate of change
		SOC		TN		C : N
	Conversion	g·kg^−1·yr^−1	Mg·ha^−1·yr^−1	g·kg^−1·yr^−1	Mg·ha^−1·yr^−1	Ratio
GLs	30	0.22	0.49	0.02	0.05	−0.01
RDCFs	15	0.80	1.49	0.07	0.14	−0.09
OCFs	30	0.21	0.39	0.02	0.03	0.01
SCLs	45	0.23	0.45	0.02	0.04	−0.06

GLs are grasslands; RDCFs are recently developed commercial farmlands; OCFs are old commercial farmlands (since 1986); SCLs are smallholder, cultivated farmland soils; ρb is bulk density; SOC refers to soil organic carbon; TN refers to total nitrogen; C : N refers carbon-to-nitrogen ratios.