Tree Species Diversity, Richness, and Similarity in Intact and Degraded Forest in the Tropical Rainforest of the Congo Basin: Case of the Forest of Likouala in the Republic of Congo

Table 5

The characteristics of ecological factors in some forests of Republic of Congo.

Type of vegetation	Minimum tree DBH	Study area (ha)	Countries	Rainfall mean (mm/year)	Shannon-Wiener index (bit)	Number of families	Number of genera	Number of trees	Number of species	Authors
	DBH ≤ 10 cm	1.5		1200–1500		47	120		153	Kimpouni et al. [23]
Forest	DBH ≥ 20 cm	35	Southwest of the Republic of Congo	1600	3.75	41		5076		Koubouana et al. [21]
Shrub savannah		400	Plateaux Teke, Republic of Congo	1600–2100	2.16	15	16	3075	25	Mampouya Wenina [24]
Fabaceae-Caesalpinioideae	DBH ≥ 20 cm	88.5	Northwest of Republic of Congo	1900	5.3	31	107	11012	133	Koubouana et al. (in press)
Forest	DBH ≥ 10 cm		Plateau des Cataractes, Republic of Congo	1400–1600 mm		42	116		153	Kimpouni [22]
Forest (monodominant Aucoumea klaineana)	DBH ≥ 10 cm		Youbi	1200				1186	71	Kimpouni et al. [25]
Mosaics of natural forest and grassland	(DBH) ≥ 10 cm	0.72	Uganda,; Youbi, Republic of Congo (southwest)	1397–1500 mm	4.02	26			93	Nangendo et al. [26]
	DBH ≥ 15 cm	1		1300	3.55, 3.47, 3.48, and 3.32	40	73	1789	92	Premavani et al. [27]
Forest	DBH ≥ 10 cm	1.96		2500–3000	3.795			808	72	Aigbe and Omokhua [28]