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TopLocation Of Area
The Environmental Protection Area of the Madeira River, with its buffer zone, is located in the Northwest region zoogeographical ZZ1 in the state of Rondonia within the political boundaries of administrative Porto Velho. The geographical references are between the coordinates of the upper left corner (63 ° 57 '52 “W / 08 ° 37' 10” S) and the lower right corner (63 ° 53 '23 “W / 08 ° 48'44” S) (RONDÔNIA, 2002) (Figure 1).
Figure 1. Location of the Environmental Protection Area of the Madeira River in Rondonia state (IBGE, n.d.) (Limit Political Administrative 1:250,000)
TopDescription Of The Area
The area lies between the parallels of segments 8 to 9 S and meridians 63 º 00 'to 64 º 30' WGr (RADAMBRASIL, 1978).
According to Radambrasil (1978), the most significant geomorphological feature in the area is the interfluvial tabular belonging to the Tertiary, lined predominantly by contacts Savannah / Forest and Open Forest. In the south-central and southeastern regions there are areas of basement and steep slope covered with dense open forest. It is noted on the southwest, Precambrian sandstone testimonials covered by Open Forest. The areas of the quaternary, ancient and modern, are located along the Cuniã creek and Mucuim, Açuã, Apone, and Madeira Rivers, and north of the Savannah identified by Cerrado Parks, which are an extension of the “Fields of Puciari - Humaitá (RADAMBRASIL, 1978). The Madeira River, except the other rivers mentioned, presents, besides forest structure, several communities settled on recent alluvial deposits.
In general, the soils situated on the left margin of the Madeira River present impediments of drainage, reflected by the type of vegetation.
In its greatest extent it is represented by Anthropic Unit Category Ap + Vsp - Livestock (grazing) + Secondary Vegetation with Palmeiras. In a dispersed form, there are areas of Lowland Rain Open Forest with Palmeiras (Abp), lower montane rain Open forest with Palmeiras (Asp) and Pioneer Formations with fluvial influence and / or lacustrine - herb (Pah), the latter on the island near Santo Antônio Falls (Figure 2).
Figure 2. Vegetation cover of the Environmental Protection Area Rio Madeira (IBGE, n.d.) (Vegetation 1:250.000)