Harm of deforestation

Deforestation will cause soil erosion, destroy ecological balance, sandstorm, affect water sources and water sources will be exhausted, and affect industrial and agricultural production and people's lives. Because afforestation can green the environment, trees carry out photosynthesis, absorb carbon dioxide and release oxygen. Trees can prevent wind and sand, prevent soil erosion and protect ecological balance.

The artificial development of land after deforestation causes the accumulation of harmful components such as herbicides and fertilizers, which pollutes water quality and has long-term potential harm. This is a criminal act that destroys the national forestry resources and seriously endangers the national economic development and the natural ecological balance.

Land desertification:

Land desertification refers to the phenomenon that the surface soil loses fine particles (silt and clay) and gradually becomes sandy due to soil erosion, or the land productivity decreases or even loses due to the invasion of quicksand (sediment). Land desertification is mostly distributed in arid and semi-arid areas with fragile ecological environment, or near large desert areas and Mingsha areas. The causes of land desertification are natural factors such as climate and human activities such as overgrazing, deforestation, land reclamation and unreasonable use of water resources. Whether land desertification occurs or not is related to soil moisture balance. When the soil water supply is less than the loss, there is a trend of desertification. Land desertification leads to the decrease of available land resources, the decline of land productivity and the intensification of natural disasters. The large-scale spread of land desertification will evolve into land desertification.

harm

Since 1950s, 670,000 hectares of cultivated land, 2.35 million hectares of grassland and 6.39 million hectares of forest land have been turned into sandy land in China. In the Houshan area of Wulanchabu City, Inner Mongolia Autonomous Region, Alashan area, the lower reaches of Tarim River in Xinjiang Uygur Autonomous Region, Qaidam Basin in Qinghai Province, Bashang area in Hebei Province and Naqu area in Xizang Autonomous Region, the desertification area increased by more than 4% on average. Due to the sandstorm, thousands of herders were forced to move to other places and become "ecological refugees".

According to the data provided by the State Forestry Administration of China, at the end of the 20th century, desertification expanded at an annual rate of 3,436 square kilometers. Every five years, the land of the administrative area of Beijing loses its use value due to desertification, and the population affected by desertification reaches1.700 million.

Land productivity has seriously declined:

Soil wind erosion is the main component of desertification and the primary link. Wind erosion will cause the loss of organic matter and fine matter in soil, which will lead to soil coarsening and fertility decline. According to sampling analysis, in Mu Us sandy land, 5&; & lt23 16; Loss of 7 cm, 7,700 kg of organic matter, 387 kg of nitrogen, 549 kg of phosphorus and 39,000 kg of physical clay particles less than 0.0 1 mm per hectare. China Academy of Sciences estimates that desertification causes 55.9 million tons of soil organic matter and nitrogen, phosphorus and potassium loss every year, equivalent to 270 million tons of chemical fertilizer, equivalent to 9.5 times the national agricultural chemical fertilizer output 1.996. Natural disasters have intensified:

There is also a kind of harm that can be directly felt by human beings, that is, it leads to the intensification of natural disasters and frequent sandstorms.

Source: Baidu Encyclopedia-Land Desertification