Shrubland

Shrubland is a diverse plant community defined by vegetation dominated by shrubs. These woody plants often grow alongside grasses, herbs, and geophytes. Shrubland can be a permanent feature of a landscape. It may also be a temporary community that appears after a disturbance like fire. Some shrublands are created by human activities such as logging or overgrazing. These activities can degrade former forests or woodlands into shrubland. Because of the high risk of fire, some shrubland areas are unsuitable for human habitation.

In botany, a shrub is a much-branched woody plant. These plants are typically less than 8 meters in height. Scientists categorize them into three main size groups. Tall shrubs usually measure between 2 and 8 meters. Small shrubs generally range from 1 to 2 meters. Subshrubs are the smallest, measuring less than 1 meter.

Ecologists use specific systems to describe the structure of these plants. In Australia, researchers look at the plant life-form and foliage cover. They measure the height and density of the tallest dominant species. For high shrubs, they use terms like closed-shrubs for dense foliage. Closed-shrubs have a foliage cover between 70% and 100%. They also use terms for sparser areas. Tall open shrubland has a very sparse foliage cover of less than 10%.

Shrublands are also recognized as a specific type of biome plant group. These are often dense thickets of evergreen sclerophyll shrubs and small trees. Different regions have unique names for these biomes. In California, they are called chaparral. In Chile, Mexico, and Spain, the term is matorral. Italy uses the name macchia. South Africa is home to the fynbos. Other examples include the kwongan in Southwest Australia and the caatinga in northeastern Brazil.

Desert scrublands, or xeric shrublands, exist in very dry environments. These plants have developed many specialized adaptations to survive. Some species have small leaves to limit water loss. Others have thorns to protect them from being eaten by grazing animals. Some plants use succulent leaves or stems to hold moisture. Many also have long taproots to reach deep groundwater.

Mediterranean shrublands occur in five specific climate regions around the world. These areas are often found near the seacoast. Plants here have adapted to survive salty air and strong winds. In the Mediterranean Basin, low and soft-leaved shrubs have local names. In France, they are called garrigue. In Greece, they are known as phrygana. In Spain, they are called tomillares, and in Israel, they are called batha.

Some shrublands grow in the interior of continents. These often appear in semi-arid areas with nutrient-poor soils. For example, the matas of Portugal grow over Cambrian and Silurian schists. Florida scrub is another example of an interior shrubland. There are also specialized types like moorland. Moorlands feature dwarf shrubs that are low-growing or creeping. These acid-loving plants can be found in heathlands.

Nature uses fire as a tool to maintain these ecosystems. Shrubland species show a wide range of adaptations to fire. Some plants produce heavy amounts of seeds to ensure regrowth. Others possess lignotubers, which are specialized structures that help them survive. Some species even require fire-induced germination to grow. This means their seeds need the heat or smoke of a fire to start growing.