Effect of Senna obtusifolia (L.) invasion on herbaceous vegetation and soil properties of rangelands in the western Tigray, northern Ethiopia

Gebrekiros, Maru G.; Tessema, Zewdu K.

doi:10.1186/s13717-018-0121-0

Ecological Processes

Table 5 Influence of Senna obtusifolia (L.) on physical and chemical soil properties under three invasion levels (non-invaded, lightly invaded, and heavily invaded) at two locations in northern Ethiopia, with statistical results of the GLM (F, P, R² values)

From: Effect of Senna obtusifolia (L.) invasion on herbaceous vegetation and soil properties of rangelands in the western Tigray, northern Ethiopia

	Kafta Humera			Tsegede			Location (Loc)		Invasion level		Loc × IL		R²_adjusted values
	Heavily invaded	Lightly invaded	Non-invaded	Heavily invaded	Lightly invaded	Non-invaded	F (df = 1,18)	P	F (df = 2,18)	P	F (df = 2,18)	P
	Mean ± SE						F (df = 1,18)	P	F (df = 2,18)	P	F (df = 2,18)	P
pH	6.83 ± 0.18	6.43 ± 0.18	6.70 ± 0.18	6.56 ± 0.21	6.17 ± 0.21	6.93 ± 0.21	6.52	0.025	0.29	0.755	0.93	0.421	0.43
EC	0.08 ± 0.01	0.07 ± 0.01	0.06 ± 0.01	0.17 ± 0.01	0.09 ± 0.01	0.06 ± 0.01	14.14	0.003	14.70	0.001	8.10	0.006	0.83
OC	1.47 ± 0.25	1.13 ± 0.25	1.32 ± 0.25	0.96 ± 0.21	1.15 ± 0.21	1.12 ± 0.21	1.27	0.282	0.07	0.933	0.56	0.584	0.17
OM	2.54 ± 0.42	1.95 ± 0.42	2.28 ± 0.42	1.94 ± 0.40	1.97 ± 0.40	1.65 ± 0.40	1.27	0.282	0.07	0.933	0.56	0.584	0.17
TN	0.078 ± 0.01	0.078 ± 0.01	0.076 ± 0.01	0.076 ± 0.03	0.078 ± 0.03	0.082 ± 0.03	0.01	0.907	0.01	0.989	0.03	0.967	0.01
AP	1.43 ± 0.56	0.85 ± 0.56	1.29 ± 0.56	1.23 ± 0.47	5.19 ± 0.47	5.83 ± 0.47	6.52	0.192	0.46	0.642	0.50	0.620	0.24
AK	114.7 ± 38.6	183.7 ± 38.6	59.3 ± 38.6	232.1 ± 42.5	237.6 ± 42.5	135.3 ± 42.5	13.26	0.003	1.59	0.245	0.04	0.958	0.58
CEC	32.33 ± 2.69	33.13 ± 2.69	28.87 ± 2.69	38.13 ± 3.86	42.60 ± 3.86	41.27 ± 3.86	9.36	0.010	0.76	0.489	0.00	0.997	0.48
Ca	7.73 ± 1.32	13.67 ± 1.32	5.87 ± 1.32	6.87 ± 1.52	13.20 ± 1.52	6.47 ± 1.52	17.81	0.001	2.38	0.134	6.39	0.013	0.75
Mg	4.73 ± 0.25	5.07 ± 0.25	4.53 ± 0.25	3.20 ± 0.27	4.67 ± 0.27	4.47 ± 0.27	1.43	0.256	4.94	0.027	8.23	0.006	0.70
K	299.2 ± 33.8	267.2 ± 33.8	224.5 ± 33.8	280.5 ± 30.6	321.6 ± 30.6	332.8 ± 30.6	3.02	0.108	1.82	0.204	0.07	0.934	0.36
Na	6.49 ± 0.54	5.78 ± 0.54	4.86 ± 0.54	6.09 ± 0.74	6.97 ± 0.74	7.22 ± 0.74	3.05	0.106	1.83	0.203	0.07	0.930	0.36
Sand	19.67 ± 2.68	13.00 ± 2.68	21.00 ± 2.68	12.33 ± 2.34	22.33 ± 2.34	24.33 ± 2.34	6.97	0.022	4.40	0.037	0.75	0.492	0.59
Silt	19.67 ± 3.97	15.00 ± 3.97	16.33 ± 3.97	20.33 ± 3.70	19.00 ± 3.70	17.00 ± 3.70	0.17	0.688	0.43	0.662	0.18	0.835	0.10
Clay	60.67 ± 6.12	70.67 ± 6.12	62.00 ± 6.12	67.33 ± 5.10	58.67 ± 5.10	60.67 ± 5.10	0.79	0.391	0.61	0.559	0.43	0.661	0.19
BD	1.27 ± 0.06	1.31 ± 0.06	1.24 ± 0.06	1.28 ± 0.08	1.22 ± 0.08	1.25 ± 0.08	0.16	0.698	0.09	0.919	0.21	0.810	0.06
MC	27.82 ± 2.22	24.80 ± 2.22	30.07 ± 2.22	27.89 ± 2.34	33.52 ± 2.34	32.31 ± 2.34	4.10	0.066	0.14	0.874	3.05	0.085	0.47

pH power of hydrogen ion (1,2.5), EC electrical conductivity (dS/cm), OC organic carbon (%), OM organic matter (%), TN total nitrogen (%), AP available phosphorus (ppm), AK available potassium (ppm), CEC cation exchange capacity (mEq/100 g), Ca calcium (cmol(+)/kg), Mg magnesium (cmol(+)/kg), K potassium (cmol(+)/kg), Na sodium (cmol(+)/kg), Sand sand (%), Silt silt (%), Clay clay (%); BD bulk density (g cm⁻³), MC moisture content (%)

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