Table 5. Mean soil masses of the generic horizon, masses in an equivalent mass of soil, SOC and TN stocks and reduction in stocks due to the different cropping and land-use systems as compare to the reference CLUS in the Dura sub-catchment, northern Ethiopia.

Cropping and land-use system	Soil mass (Mg ha-1) at fixed depth of 0.20 m	Thickness of genetic horizon (m)	Soil mass of genetic horizon (Mg ha-1)	Thickness to attain ESM (m)	Equivalent soil mass (ESM) (Mg ha-1)	SOC stock (Mg C ha−1)	SOC stock reduction (%)	TN stock (Mg N ha−1)	TN stock reduction (%)
TM	3200	0.150	2400	0.220	3520	22.6e	87.1a	2.36e	82.7b
MM	2800	0.171	2394	0.252	3520	54.2c	69.1c	4.75c	65.1e
IC1	2940	0.160	2352	0.239	3520	44.0d	74.9b	4.19d	69.2d
IC2	3200	0.150	2400	0.220	3520	42.9d	75.5b	4.08d	70.0cd
R1	2860	0.168	2402	0.246	3520	38.9d	77.8b	3.80d	72.0c
R2	2880	0.167	2405	0.244	3520	39.2d	77.7b	3.84d	71.8c
TG	2640	0.182	2403	0.266	3520	123.9b	29.3d	9.05b	33.5f
UTG	3520a	0.136	2394	0.200	3520	14.5f	91.7a	1.20f	91.2a
NF	2400	0.200	2400	0.293	3520	175.3a	-	13.6a	-
Mean						61.8	64.8	5.20	61.8

TM, Teff (Eragrostis tef (Zucc) Trot)) mono-cropping; MM, Maize (Zea mays L.) mono-cropping; IC1; Cauliflower (Brassica oleracea var. botrytis) with maize intercropping; IC2, Red beet (Beta Vulgaris) with maize intercropping; R1, Cauliflower – teff - maize rotation; R2, Onion (Allium cepa L.)- maize - onion rotation; TG, Treated gully; UTG, Untreated gully; NF, Natural forest land system.

^aThe UTG land use and cropping system was used as the equivalent soil mass (heaviest soil) for the fixed depth of 0.20 m in which the other CLUS soil thickness that required to attain this mass was calculated.