Structure and tree species composition in different habitats of savanna used by indigenous people in the Northern Brazilian Amazon

Abstract

BackgroundWoody plant diversity from the Amazonian savannas has been poorly quantified. In order to improve the knowledge on wood plants of these regional ecosystems, a tree inventory was carried out in four different habitats used by indigenous people living in the savanna areas of the Northern Brazilian Amazon. The habitats were divided into two types (or groups) of vegetation formations: forest (riparian forest, forest island, and buritizal = Mauritia palm formation) and non-forest (typical savanna). The inventory was carried out in two hectares established in the Darora Indigenous Community region, north of the state of Roraima.New informationThe typical savanna is the most densely populated area (709 stems ha-1); however, it has the lowest tree species richness (nine species, seven families) in relation to typical forest habitats: riparian forest (22 species, 13 families and 202 stems ha-1), forest islands (13 species, 10 families and 264 stems ha-1), and buritizal (19 species, 15 families and 600 stems ha-1). The tree structure (density and dominance) of the forest habitats located in the savanna areas studied in this work is smaller in relation to forest habitats derived from continuous areas of other parts of the Amazon. These environments are derived from Paleoclimatic fragmentation, and are currently affected by the impact of intensive use of natural resources as timberselective logging and some land conversion for agriculture.

Can Stand Density and Stem Stratification Be Indicators of Aboveground Biomass in Woody Plant Recruitment in Savannah

“…In case of restoration post disturbance, plant actively grow through production and differentiations new aerial organs as multiple stems (Zida et al, 2009) in juvenile to tree transition and become established as adult trees. Our results agree with previous studies carried out in dry and humid environments (Oliveira et al, 2017;Astri et al, 2020). Oliveira et al (2017) had indicated that in forest and non-forest environments, more individuals are distributed in the minor diameter classes while few individuals are found in the major diameter classes and Astri et al (2020) reported that small sized trees were positively connected with great AGB in savannah system.…”

“…Our results agree with previous studies carried out in dry and humid environments (Oliveira et al, 2017;Astri et al, 2020). Oliveira et al (2017) had indicated that in forest and non-forest environments, more individuals are distributed in the minor diameter classes while few individuals are found in the major diameter classes and Astri et al (2020) reported that small sized trees were positively connected with great AGB in savannah system. But, according to these last authors, the contri-S. Traoré et al DOI: 10.4236/ojf.2022.121003 55 Open Journal of Forestry butions of small sized trees to basal area and stem density were significantly different between vegetation types.…”

“…Thoroughly, increase in plant number did not conduct to increase in species richness indicating the (co)-existence of few species represented by many individuals (see Table 1) as their response to each vegetation singularity and spatial heterogeneity. It is obvious that vegetation type as canopy layer (with or without soil type) is preponderant in woody species assemblage, density and through the plasticity of some species to colonize and establish in savannah ecosystem (Williams et al, 1996;Oliveira et al, 2017). But the level at which variation occur differ from one to another vegetation type with respect to tree adaptive strategy and performance (Traoré and Jouquet, 2020).…”

Floristic composition in ecotone forests in northern Brazilian Amazonia: preliminary data

“…One such area is the State of Roraima, located in the northern part of the Brazilian Amazonia. This ~225,000 km 2 area contains ecotone forest zones of great geoecological importance because they are located between Guiana Shield (highland savannas and tropical dry forests) and Central Amazonia (lowland tropical forests) (Barbosa and Bacelar-Lima 2008, Oliveira et al 2017), which gives them a unique phytogeographical and ecoevolutionary history, where a high degree of endemism is observed and unique vegetation sets exist (Nascimento and Proctor 1997, Milliken and Ratter 1998). However, the region has received few forest inventories and floristic surveys (Suppl.…”

Heat production from biological wood oxidation

“…The trees used in this PhD thesis were birch tree and ash tree. Although birch tree and ash tree are hardwood, they have different chemical composition (Kizha, 2008;ODE, 2003;Oliveira et al, 2017;Wittmann et al, 2008;WoodDatabase, 2020). Studies regarding the effect of different wood types on degradation are rare, especially in mixed culture.…”