Tree Species Diversity in a Naturally Regenerated Secondary Forest in the Ruhande Arboretum, Rwanda

Table 2

Shannon–Weiner (H), species evenness (E), and Simpson’s diversity (D) indices of woody species identified in the study area. Pi stands for the proportion of individuals of a species/plot (n) to the total population of that species (N); ln is the natural log and S denotes the species richness in the study area.

S/N	Species name	n/N (=pi)	pi^2	lnpi	pi (lnpi)	H/lnS
1	Markhamia lutea	0.466	0.217185	−0.764	0.356	0.107
2	Polyscias fulva	0.259	0.066895	−1.352	0.350	0.105
3	Cedrela serrata	0.081	0.006569	−2.513	0.204	0.061
4	Tecoma stans	0.024	0.000568	−3.736	0.089	0.027
5	Croton megalocarpus	0.023	0.000513	−3.788	0.086	0.026
6	Prunus africana	0.023	0.000513	−3.788	0.086	0.026
7	Albizia gummifera	0.018	0.000320	−4.024	0.072	0.022
8	Ekebergia capensis	0.014	0.000205	−4.247	0.061	0.018
9	Podocarpus falcatus	0.014	0.000205	−4.247	0.061	0.018
10	Erythrina abyssinica	0.011	0.000115	−4.535	0.049	0.015
11	Maytenus heterophylla	0.011	0.000115	−4.535	0.049	0.015
12	Syzygiummguineense	0.008	0.000070	−4.786	0.040	0.012
13	Erythrococcabongensis	0.008	0.000070	−4.786	0.040	0.012
14	Ligustrum lucidium	0.007	0.000051	−4.940	0.035	0.011
15	Grevillea robusta	0.006	0.000036	−5.123	0.031	0.009
16	Eriobotrya japonica	0.005	0.000023	−5.346	0.025	0.008
17	Acanthus pubescens	0.004	0.000013	−5.634	0.020	0.006
18	Spathodea companulata	0.002	0.000006	−6.039	0.014	0.004
19	Calliandracalothyrsus	0.002	0.000006	−6.039	0.014	0.004
20	Senecio manii	0.002	0.000006	−6.039	0.014	0.004
21	Euphorbia umbellata	0.002	0.000006	−6.039	0.014	0.004
22	Annona reticulata	0.002	0.000006	−6.039	0.014	0.004
23	Nicotiana tabacum	0.001	0.000001	−6.732	0.008	0.002
24	Jacaranda mimosifolia	0.001	0.000001	−6.732	0.008	0.002
25	Cupressus lusitanica	0.001	0.000001	−6.732	0.008	0.002
26	Ficus benjamini	0.001	0.000001	−6.732	0.008	0.002
27	Leucaena diversifolia	0.001	0.000001	−6.732	0.008	0.002
28	Dracaena steudneri	0.001	0.000001	−6.732	0.008	0.002
	.		0.293500	H′	1.772	0.532
	.			D	3.407
	.			E	0.532

H, D, and E stand for Shannon–Weiner index, Simpson’s diversity, and species evenness, respectively.