|
Purus Várzea
The Purus várzea (NT0156) is an ecoregion of seasonally flooded várzea forest in the central Amazon basin. It is part of the Amazon biome. The ecoregion is home to a vegetation adapted to floods of up to that may last for eight months. There is a great variety of fish and birds, but relatively fewer mammals. Ground-dwelling mammals must migrate to higher ground during the flood season. Threats include logging, cattle farming, over-fishing and mercury pollution from gold mining. Location The Purus várzea is a low-lying region of the central Amazon basin that is seasonally flooded. It covers of eastern Colombia and western Brazil. It extends along most of the Juruá, central Purus, and Caquetá ( Japurá) rivers and their tributaries. In the east it reaches the confluence of the Japurá and Solimões Rivers. Urban centers in or around the region are Tefé, Tabatinga and Carauarí. To the southeast the varzea adjoins the Purus–Madeira moist forests, and to the northeast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mapinguari National Park
Mapinguari National Park ( pt, Parque Nacional Mapinguari) is a national park in the states of Rondônia and Amazonas, Brazil. It covers a large area of Amazon rainforest. The boundaries have been adjusted several times. Location The Mapinguari National Park is in the municipalities of Canutama (40%) and Lábrea (50%) in Amazonas and the municipality of Porto Velho (11%) in Rondônia. It has an area of . The park is in the Solimões-Amazonas sedimentary basin, in the south Amazon depression. The relief is an extensive pediplain with river terraces, floodplains and meander traces. Altitudes range from above sea level. It is drained by streams or rivers feeding the left of the Madeira River and the right of the Purus River. The main rivers within the park are the Açuã, Mucuim, Inacorrã, Umari, Ciriquiqui, Punicici, Coari, Anaiquê and Coti. Environment The park is in the Amazon biome. Average annual rainfall is . Temperatures range from with an average of . Vegetation i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japurá–Solimões–Negro Moist Forests
The Japurá–Solimões–Negro moist forests (NT0132) is an ecoregion of tropical moist broad leaf forest in the Amazon biome. Location The Japurá–Solimoes–Negro moist forests ecoregion is named for the Japurá, Solimões, and Negro rivers. Almost all of the ecoregion is in the central northern part of the Brazilian Amazon basin, with a small portion in Colombia. It has an area of . Conservation units include the Jaú National Park and the Mamirauá Sustainable Development Reserve. The ecoregion lies on the lowland plateau in the interfluvial between the Rio Negro and the Solimões River. In Colombia the region skirts the foothills of the Guiana Shield to the northwest, and contains the lower Vaupés River basin and the land south of the Guainía River, the name of the upper Rio Negro in Colombia. The region is then bounded by the Rio Negro along the border with Venezuela and into Brazil to its confluence with the Solimões at Manaus. The southern border is defined ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tropical And Subtropical Moist Broadleaf Forests
Tropical and subtropical moist broadleaf forests (TSMF), also known as tropical moist forest, is a subtropical and tropical forest habitat type defined by the World Wide Fund for Nature. Description TSMF is generally found in large, discontinuous patches centered on the equatorial belt and between the Tropic of Cancer and Tropic of Capricorn, TSMF are characterized by low variability in annual temperature and high levels of rainfall of more than annually. Forest composition is dominated by evergreen and semi-deciduous tree species. These trees number in the thousands and contribute to the highest levels of species diversity in any terrestrial major habitat type. In general, biodiversity is highest in the forest canopy. The canopy can be divided into five layers: overstory canopy with emergent crowns, a medium layer of canopy, lower canopy, shrub level, and finally understory. These forests are home to more species than any other terrestrial ecosystem: Half of the world's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bar (river Morphology)
A bar in a river is an elevated region of sediment (such as sand or gravel) that has been deposited by the flow. Types of bars include mid-channel bars (also called braid bars and common in braided rivers), point bars (common in meandering rivers), and mouth bars (common in river deltas). The locations of bars are determined by the geometry of the river and the flow through it. Bars reflect sediment supply conditions, and can show where sediment supply rate is greater than the transport capacity. A mid-channel bar, is also often referred to as a braid bar because they are often found in braided river channels. Braided river channels are broad and shallow and found in areas where sediment is easily eroded like at a glacial outwash, or at a mountain front with high sediment loads. These types of river systems are associated with high slope, sediment supply, stream power, shear stress, and bed load transport rates. Braided rivers have complex and unpredictable channel patterns, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swale (landform)
A swale is a shady spot, or a sunken or marshy place. In US usage in particular, it is a shallow channel with gently sloping sides. Such a swale may be either natural or human-made. Artificial swales are often infiltration basins, designed to manage water runoff, filter pollutants, and increase rainwater infiltration. Bioswales are swales that involve the inclusion of plants or vegetation in their construction, specifically. On land This swale concept has also been popularized as a rainwater harvesting and soil conservation strategy by Bill Mollison, David Holmgren, and other advocates of permaculture. In this context it is usually a water-harvesting ditch on contour, also called a ''contour bund''. Swales as used in permaculture are designed to slow and capture runoff by spreading it horizontally across the landscape (along an elevation contour line), facilitating runoff infiltration into the soil. This archetypal form of swale is a dug-out, sloped, often grassed or reeded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
