Diazotrophic Bacterial Community of Degraded Pastures

Table 6

Shannon-Weaver diversity index of the total 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
	Shannon-Weaver diversity index
Highly degraded			2.98
Partially degraded			2.93
Slightly degraded			2.94
Mean	2.95	2.95
test ()
Degradation stage
Niche of association
Stage × association
CV	2.93

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 0,1% probability by test. significant.