What is land desertification and what is the difference between it and desert?

The reason of land desertification is the unreasonable use of land by human beings, which is mainly reflected in the following aspects: firstly, excessive reclamation will destroy the vegetation, litter and crust on the soil surface, the exposed soil will dry quickly under the action of sunlight and monsoon, the original aggregate structure will be destroyed, and the adhesion will be lost. Fine particles and other nutrients will be taken away by wind or precipitation, and coarse particles without nutrition will be left behind, forming desertification. Second, overgrazing, grazing is mainly reflected in the destruction of surface vegetation by livestock and the destruction of surface crust by trampling. Third, too much firewood. Fuelwood mainly leads to the decline of vegetation diversity and the weakening of wind erosion resistance.

Desert is a kind of landform, and its genesis is formed under many complicated factors such as climatic conditions and geological activities, and its formation time span is very long. Their expansion and contraction are greatly influenced by the climate, contracting when wet and expanding when dry. Distributed in arid areas, the area is vast and the terrain is complex.