Abstract
Floristic inventory and diversity assessments are necessary to understand the present diversity status and conservation of forest biodiversity. Studying the variation height-diameter woody provides insight into the general characteristics of the trees diversity pattern. This study mainly focuses on aimed to assess the effectiveness of trees diversity and structure in two study sites. The study was conducted at Ipendja evergreen lowland moist forest in northern Republic of Congo. The sampling design was systematic consisted of parallel transect 1 or 2 km part, and divided into consecutive rectangular plots, each 5000m2 (25 x 200 m, i.e. 0.5 ha). Within eight plots censuses, all trees with a DBH 10 cm were identified and measured. A total of 1340 trees has been recorded belonged 145 species and 36 families (n = 607 and n = 733, respectively in Mokelimwaekili and Sombo sites). The results show that the leading botanical families were Sapotaceae follows by Euphorbiaceae, Meliaceae, Caesalpiniaceae, Sterculiaceae, Annonaceae and Rubiaceae. The most representative species were C. mildbraedii, S. kamerunensis and P. oliveri, i.e. 62.06%, 30.34% and 28.27% respectively, suggested that they were the leading dominant species of this forest ecosystem. Shannon index were 4.29 bits for Mokelimwaekili and 4.22 bits for Sombo. While Pielou’s evenness index was between 0.88 and 0.90, respectively for the Mokelimwaekili and Sombo sites. The similarity coefficient for Jaccard was 62% and 58% for Sorensen. There are highlight variations in tree diversity indices across sites and plots in Ipendja forest.
Highlights
The growing interest of policy makers in conservation and sustainable management of natural resources has led them to take legal law in favor of biodiversity (Folega et al, 2010)
It was important to emphasize that the 1340 trees recorded in Ipendja forest during the inventory were taller than the number of trees founded (1100 trees) by Kimpouni et al (2008) in the Congolese littoral
We identified that site2 (Sombo) have more trees than site1 (Mokelimwaekili) by the fact that site2 (Sombo) has been received a selective logging during 2002-2003 and the forest ecosystem is in regeneration period
Summary
The growing interest of policy makers in conservation and sustainable management of natural resources has led them to take legal law in favor of biodiversity (Folega et al, 2010). The law investment in the forestry sector, increasing population pressure and weak public institutions affect forestry resource management, deforestation and forest service quality, threatening the ecosystems (Folega et al, 2014; FAO, 2016). Tropical forests constitute the most diverse plant communities on earth (Supriya-Davi and Yadava, 2006; Ekoungoulou et al, 2014b; Fayolle et al, 2015; FAO, 2016). These forests are disappearing at alarming rates owing to deforestation for extraction of timber and other forests products (Supriya-Devi and Yadava, 2006; Ouedraogo et al, 2011; Ekoungoulou, 2014). Tropical forests are the subject of several studies to better understand the role they ijb.ccsenet.org
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