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Xeric shrublands can experience woody plant encroachment, which is the thickening of bushes and shrubs at the expense of grasses. [5] This process is often caused by unsustainable land management practices, such as overgrazing and fire suppression, but can also be a consequence of climate change.
A xerophyte (from Ancient Greek ξηρός (xērós) 'dry' and φυτόν (phutón) 'plant') is a species of plant that has adaptations to survive in an environment with little liquid water. Examples of xerophytes include cacti , pineapple and some gymnosperm plants.
Vegetation types range from forests to woodlands, savannas, shrublands, and grasslands; "mosaic habitat" landscapes are common, where differing vegetation types are interleaved with one another in complex patterns created by variations in soil, topography, exposure to wind and sun, and fire history. Much of the woody vegetation in Mediterranean ...
Historically this area was covered by tropical dry deciduous forest, but this only remains in isolated fragments. The vegetation now consists of mainly of southern tropical thorn scrub type forests. These consist of open woodland with thorny trees with short trunks and low, branching crowns; spiny and xerophytic shrubs; and dry grassland.
The dominant vegetation of this ecoregion is sagebrush (Artemisia tridentata), often associated with various Agropyron species or fescue grass.At its upper altitudinal limit, the shrub steppe grades into the bordering mountain ecoregions, namely the South Central Rockies forests, the Colorado Rockies forests and the Wasatch and Uinta montane forests.
Sand dunes in the Sahara Desert. Desert ecology is the study of interactions between both biotic and abiotic components of desert environments. A desert ecosystem is defined by interactions between organisms, the climate in which they live, and any other non-living influences on the habitat.
The vegetation is similar to the dry deciduous forests to the north, but includes more dry-adapted, xerophytic species. Forests and open-canopied woodlands, reaching 15 metres (49 ft) in height, contain trees and shrubs of the families Burseraceae , Euphorbiaceae , Fabaceae , and Sapindaceae .
The region has been heavily affected by grazing, logging, dams, and water diversions, intensive agriculture and urbanization, as well as competition by numerous introduced or exotic plant and animal species. Some unique plant communities, like southern California's Coastal Sage Scrub, have