1 As an unstable landform, it has great influence on the construction of buildings and roads. This has become an important factor restricting the local economic development.
2. The problem of soil erosion is serious, and the direct consequence is the serious loss of soil organic matter and barren land, which seriously hinders agricultural production.
Form:
The main reason why karst landforms are widely distributed in the southwest of China is that there are main bodies of its development. A large number of carbonate rocks, sulfate rocks and halide rocks have formed various strange caves on the surface and underground under the constant dissolution of running water.
This wonderful natural action can be expressed by chemical equation: CaCO3+CO2+H2O=Ca(HCO3)2. If the water in which calcium bicarbonate is dissolved is heated or the environmental pressure suddenly decreases, the dissolved calcium bicarbonate will decompose and become calcium carbonate again. The reaction equation at this time is: Ca(HCO3)2 =CaCO3↓+CO2↑+H2O.
Southwest China has a humid climate, a large amount of precipitation, relatively stable surface runoff, and continuous infiltration of running water. Precipitation effectively updates and supplements the running water, so the karst process can continue.
Extended data:
Classification of karst landforms
1. According to the exposed conditions, karst landforms can be divided into three types: bare karst, covered karst and buried karst.
2. According to climatic zones, it can be divided into five types: tropical karst, subtropical karst, temperate karst, cold karst and arid karst.
3. According to lithology, it can be divided into four types: limestone karst, dolomite karst, gypsum karst and salt karst.
Baidu encyclopedia-karst landform