de Oliveira Rodrigo Leonardo Costa, Farias Hugo Leonardo Sousa, Perdiz Ricardo de Oliveira, Scudeller Veridiana Vizoni, Imbrozio Barbosa Reinaldo
State University of Roraima, Boa Vista, Brazil.
Federal University of Roraima, Boa Vista, Brazil.
Biodivers Data J. 2017 Sep 28(5):e20044. doi: 10.3897/BDJ.5.e20044. eCollection 2017.
Woody 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 = 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.
The typical savanna is the most densely populated area (709 stems ha); 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), forest islands (13 species, 10 families and 264 stems ha), and (19 species, 15 families and 600 stems ha). 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.
亚马逊稀树草原木本植物的多样性一直未得到充分量化。为了增进对这些区域生态系统木本植物的了解，在巴西北部亚马逊稀树草原地区生活的原住民所使用的四种不同栖息地进行了树木清查。这些栖息地被划分为两种类型（或组）的植被形态：森林（河岸森林、森林岛和棕榈林）和非森林（典型稀树草原）。清查工作在罗赖马州北部达罗拉原住民社区地区划定的两公顷区域内进行。
典型稀树草原是人口最密集的区域（每公顷709株）；然而，与典型森林栖息地相比，其树种丰富度最低（9种，7科），典型森林栖息地包括河岸森林（22种，13科，每公顷202株）、森林岛（13种，10科，每公顷264株）和棕榈林（19种，15科，每公顷600株）。本研究中所调查的稀树草原地区森林栖息地的树木结构（密度和优势度）相对于源自亚马逊其他地区连续区域的森林栖息地较小。这些环境源自古气候破碎化，目前受到诸如选择性木材采伐和一些农业土地转换等自然资源密集利用的影响。
