Diazotrophic Bacterial Community of Degraded Pastures

Table 4

Shannon-Weaver diversity index of the cultivated diazotrophic bacterial community in different niches of plant/bacteria association in B. decumbens Stapf. pasture in different stages of degradation.

Pasture degradation stage	Niche of plant/bacteria association		Mean
	Rhizospheric soil	Root-endophytic
Highly degraded			2.03
Partially degraded			2.16
Slightly degraded			2.24
Mean	2.25	2.04
	test ()
Degradation stage
Niche of association
Stage × association
CV	24.92

of variation (CV) = 100 × standard deviation/average. Means followed by the same letter, uppercase in the row and lowercase in the column, do not differ statistically by the Scott-Knott test (). at 1% probability by test. significant.