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SCI7 Unit 2 - 8b. Ecoregions of Texas
Terms in this set (21)
gently rolling and hill country with numerous streams. The vegetation of the area is characterized by extensive pine and pine hardwood forests with swaps, marshes, and bogs adjacent to and in the flood plants of tributaries. Lumber, development, and oil and gas exploration threatens the remaining natural vegetation.
The Coastal Prairie occurs as a nearly level plain and is traversed by many streams and larger rivers.Along the larger rivers and streams, belts of bottom land forests occur bisecting the otherwise vast grasslands dominated by characteristics of tall grass prairie species. In addition to losses from development, suppression of natural fires, and overgrazing, invasive plant species are reducing the remaining natural vegetation and the animals that depend on it.
these areas are dominated by many fresh to salt tolerant plant species. The entire region is an important winter destination to migratory waterfowl. Rainfall averages about 50 inches annually in the extreme eastern limit
This is gently rolling to level landscape with fertile, deep , and darkly colored clay soils under tall grass prairie vegetation dominated by big blue stem, little blue stem, switch grass, and Indian grass. Most of the area has been converted to cultivated crops or developed during the urban expansion, but a few small remnants of natural vegetation remain. Annual rainfall averages from 30 inches in the west to more than 40 inches east
Cross Timbers (Oak Wood) Prairies*
large rolling and hilly area of alternating woodlands and strips of the Blackland Prairies. The sharp contrast in vegetation is due to difference in soils and topography. The woodlands are dominated by live oak,juniper, and mesquite. Area is used for grazing and converted to agriculture. Bountifully supplied with buffalo, bear, deer, antelope, wild boars, partridges, and turkeys
South Texas Brush Country*
known as the Tamaulipan thorns scrub. Topography is level of to rolling. thorny brush is the predominant vegetation type in the region. Great diversity of animal life than any other Texas. It is that range northward, and some desert species commonly founded in the Trans Pecos. The average annual rainfall of 16 to 35 inches.
Hill country. the most characteristic plant communicates are thickets dominated by ash juniper, plateau live oak, mesquite, and huisache. Much of the area was maintained as a savannah by frequent fires ignited by lightning. Woody plants were more widely scatter and the open areas between dominated by grass species characteristics of tall grass parries. Average annual rainfall increases from west to east, ranging from 15 to 33 incehes
Topography is gently rolling to moderately rough and dissected by narrow intermittent stream valleys flowing east to southeast. The original prairie vegetation included tall and mid grasses. Stream floodplains are dominated by various hardwood species. Juniper clings to the steep slopes along rivers.
The region lies at the southern end of the Great Plains of the central United States. This region is also known for its numerous "play a lakes"; small to large shallow, round depressions that spot the landscape.There are also many larger salt lakes that provide winter habitat for sand hill cranes and other waterfowl. Average annual rainfall is 15 to 21 inches.
this region of extreme western Texas is the most complex of all the regions and lies within the Chihuahuan Desert. Elecations range from 2,500 to more than 8,500 feet in the Chissos Mnt. This is a region of strongly diverse habitats and vegetation , varying from desert valleys and plateaus to wooded mountain slopes. Even the mnt. vary, with some composed of volcanic rocks, and others of limestone.
presence of plants and trees helps to prevent soil erosion during rainfall events, which occur in this ecoregion
Gulf Coast Prairies and Marshes*
waves can erode beaches in one area and redeposit the sand in a different
location along the coast. The sand may also redeposit to form sandbars. Strong storms and hurricanes in this
area can increase beach erosion
Oak Woods and Prairies
defined by the oak woodland and grassland ecosystems; If these ecosystems
experience clear cutting of their trees and grasses, their soils become easily eroded by wind and water. Plowing
farmland in order to plant crops also increases soil erosion
defined by the oak woodland and grassland ecosystems; clear cutting of their trees and grasses, their soils become easily eroded by wind and water. Plowing
farmland in order to plant crops also increases soil erosion
limestone in this region is vulnerable to chemical weathering, so limestone land
features are constantly changing; rivers weather and erode the land, forming
several canyons in this area
Palo Duro Canyon is located in this ecoregion
and was formed by the weathering and erosion of rock by the waters flowing through the Red River; dry
conditions can lead to wind erosion in areas with little vegetation
weathering and erosion of the Guadalupe and Davis Mountains has formed the soil in this
ecoregion; wind acts as the main erosion agent, creating sand dunes. When this
ecoregion does receive rain, it can lead to flashfloods, which can weather and erode the rocks and sediment.
South Texas Brush Country
grasslands in this area were used to graze
livestock, which led to exposed soil and erosion
large dome of granite that is physically weathered through exfoliation,
where sheets of rock peel away from the rock surface
large amounts of limestone rock
formations, which are vulnerable to chemical weathering, which has led to the formation of a large cave system
moving water causes erosion and deposition of sand along the gulf floor
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