Impacts of Different Tree Species of Different Sizes on Spatial Distribution of Herbaceous Plants in the Nigerian Guinea Savannah Ecological Zone

Table 2

Species richness, diversity, and evenness from inside and outside crown zones and the open field, with the estimates of their standard deviation (StDev) and Standard Error of the Mean (SE Mean). PB: P. biglobosa; DO: D. oliveri; VP: V. paradoxa.

	PB inside	PB outside	DO inside	DO outside	VP inside	VP outside	Open field	SE Mean	StDev
Species richness	31	33	39	38	31	29	20	2.39	6.32
Shannon Index	3.92	3.34	4.16	3.73	3.69	3.38	3.39	0.117	0.31
Evenness	0.79	0.66	0.79	0.71	0.74	0.7	0.78	0.0192	0.0508