Diazotrophic Bacterial Community of Degraded Pastures

Table 1

Soil chemical and physical attributes in the layer of 0.0–0.2 m of pastures cultivated in different degradation stages for the collection of plant and rhizospheric soil samples to characterize the diazotrophic bacterial community.

Attribute	Pasture
	Highly degraded	Partially degraded	Slightly degraded
pH water (1 : 2.5)	6.02	5.05	6.01
Ca^2+ ( dm^−3)	0.45	0.40	0.50
Mg^2+ ( dm^−3)	0.15	0.10	0.20
K^+ ( dm^−3)	0.12	0.18	0.12
Na^+ ( dm^−3)	0.02	0.02	0.03
Al^3+ ( dm^−3)	0.10	0.15	0.10
(H + Al) ( dm^−3)	0.40	0.25	0.35
P (mg dm^−3)	15.44	52.63	31.79
TOC (g kg^−1)^1	1.20	0.70	0.60
( dm^−3)^2	0.84	0.85	0.95
( dm^−3)^3	1.14	0.91	1.20
V (%)^4	64.91	76.92	70.83
m (%)^5	11.90	17.65	10.53
Total sand (g kg^−1)	92.13	91.82	91.94
Coarse sand (g kg^−1)	76.45	75.86	74.92
Fine sand (g kg^−1)	15.68	15.96	17.02
Silt (g kg^−1)	4.41	5.40	3.24
Clay (g kg^−1)	3.45	2.77	4.83
Textural class	Sandy	Sandy	Sandy

organic carbon. cation exchange capacity. cation exchange capacity. saturation. saturation.