Desert

The climate is extremely arid, evaporation exceeds precipitation, vegetation is sparse, or even vegetation-free, and the ground is not depressed ecosystem, which is dominated by ultra-dry shrubs, semi-shrubs or semi-trees. Mainly distributed in subtropical arid areas, extending northward into temper zones and more easily formed within continents far from the oceans. Desert vegetation has three main types of life type: developed roots, small and thick shrubs, semi-shrubs, meaty plants with special water receptacles and short-lived plants that quickly complete their life cycles in wet seasons. Animal species are relatively rich, there are three-toed jumping rat yako, sand rat yako animals, as well as camels, ostrich, North American glu, South American , some of Australia has bags and thym and so on. Deserts are widely distributed, such as the Sahara Desert in North Africa, the Arabian Desert, Central Asia and East Asia Desert are typical deserts. The low productivity of desert ecosystems, overgrazing and some man-made factors have led to the expansion of desert areas, and it is imperative to prevent land desertification and sand consolidation.