Land cover types and global spatial patterns for QCE Geography Unit 3

What this dot point is asking

QCAA wants you to identify the major categories of land cover, describe what each one is, and describe how they are distributed across the globe and within regions. Land cover is the observable biophysical material on the surface of the Earth. This is the foundation dot point of Unit 3: before you can explain how cover changes, you must be able to classify it and read its spatial pattern. The command word "describe" means you state the features and patterns clearly, using direction, distance, distribution and named places. Strong answers separate land cover from land use, name the major classes, and describe their pattern with reference to latitude, climate and relief.

The answer

Land cover versus land use

Land cover is what physically covers the ground: trees, grass, crops, water, ice, sand or buildings. Land use is the human purpose for that land: recreation, agriculture, conservation or housing. The two are linked but distinct. A grassed area can be a sports field (recreation use), grazing paddock (agricultural use) or remnant reserve (conservation use) while sharing the same grass cover. Keeping these separate is the single most important conceptual move in Unit 3.

The major types of land cover

Geographers classify land cover into a set of broad classes that satellites can detect:

• Forest. Closed canopy tree cover, divided into tropical, temperate and boreal forest.
• Grassland and savanna. Continuous grass with scattered or no trees.
• Cropland and pasture. Land converted to growing crops or grazing.
• Desert and semi-arid land. Sparse vegetation on bare or sandy ground.
• Tundra. Low cold-climate vegetation over permafrost.
• Ice and snow. Permanent ice sheets, glaciers and sea ice.
• Wetland, mangrove and coastal cover. Saturated or tidal vegetated land.
• Built-up land. Impervious urban and industrial surfaces.

Global spatial patterns

The global pattern of land cover is controlled mainly by climate, which itself varies with latitude. Near the equator, high rainfall and warmth produce a belt of tropical rainforest across the Amazon, Congo and Southeast Asia. Around the tropics of Cancer and Capricorn, descending dry air produces the great desert belts: the Sahara, Arabian, Australian and Atacama deserts. In the mid-latitudes, continental interiors with moderate rainfall produce grasslands such as the North American prairies and the Eurasian steppe. At high latitudes, a band of boreal forest (taiga) crosses Canada and Russia, giving way poleward to tundra and then permanent ice across Greenland and Antarctica.

Regional patterns in Australia

Australia shows the global rule clearly. The continent is dominated by arid and semi-arid cover: spinifex grassland, mulga shrubland and desert occupy the centre and west. Forest and woodland concentrate where rainfall is higher, along the eastern seaboard from Cape York to Tasmania and in the far southwest of Western Australia. Tropical savanna stretches across the monsoonal north. Built-up cover is a thin coastal fringe concentrated in the southeast around the major cities. This pattern of a wet, vegetated, populated rim around a dry, sparsely covered interior is a defining feature of Australian geography.

Mapping the pattern

Spatial patterns of land cover are identified using satellite remote sensing. Sensors such as Landsat and Sentinel record reflected light across multiple bands; vegetation, water, soil and built surfaces each reflect differently, allowing software to classify every pixel into a cover type. Repeated imagery over time lets geographers measure change. National datasets such as the Australian Land Use and Management classification turn this imagery into maps that planners and researchers use.

Examples in context

Example 1. The tropical forest belt. Rainforest forms a near-continuous equatorial band because consistent warmth and high rainfall favour closed-canopy trees. This explains why deforestation is concentrated in Brazil, Indonesia and the Congo Basin.

Example 2. Australian arid interior. Low and variable rainfall across central Australia produces spinifex and desert cover. The pattern explains why population and built-up cover cling to the better-watered coast.

Example 3. The boreal-to-tundra transition. Across northern Canada and Russia, boreal forest gives way to tundra as temperatures fall, a climate-controlled boundary that is now shifting as the high latitudes warm.