Desertification is mainly caused by human beings (deforestation) (over-cultivation) (over-grazing). At present, the desertified land in China has reached (1.7397 million square kilometers), accounting for (1.8)% of the total land area.

In view of this, we have adjusted the strategy of sand control, from one-sided emphasis on the development of artificial vegetation to active development of artificial-natural arbor-shrub-grass composite vegetation; From simply protecting oases to actively protecting the whole desert ecosystem, only by rebuilding the desert ecosystem can we fundamentally curb the momentum of desertification expansion, reverse the passive situation of desertification and soil erosion prevention and control, and effectively improve the macro-ecology and environment in northwest China.

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China has desertification land 1.54 million km 2, accounting for 1.06% of the total land area, including desert Gobi 1.60 million km 2, desertification land 340,000 km 2 and aeolian land 40,000 km 2. The desert and sandy land in China are mainly distributed between 37 and 420 north latitude.

Some data show that land desertification is drastically reducing the land that we can effectively use. Many places are due to

The trend of desertification leads to land degradation, soil structure destruction, soil nutrient loss and soil fertility natural recovery.

It will take decades, hundreds or even thousands of years. If artificial measures are taken to restore soil fertility, it is necessary to

It is difficult to calculate important inputs.

Desertification is particularly harmful to agriculture. April to May is the spring sowing season every year. In desertification areas,

Seeds and fertilizers are often blown away, seedlings are uprooted, soil moisture is lost, and seedlings are blown dry or die.

Buried. Some places have to be remedied repeatedly, even the farming season has been delayed.

Grassland degradation caused by desertification gradually reduces or even completely loses the dominant grass species suitable for livestock growth.

Forage becomes low and sparse, the yield is obviously reduced, and the livestock carrying capacity of grassland is greatly reduced.

Desertification has blocked rivers, reservoirs and canals. The Yellow River transports 6543.8 0.6 billion tons of sand every year, including 6543.8 0.2 billion tons.

Hundreds of millions of tons come from desertification areas. Every year, more than 50,000 kilometers of irrigation canals are threatened by sandstorms.

Desertification has caused damage to railway subgrade, bridges and culverts in some areas, and to highway subgrade and pavement.

Sand, forcing road traffic interruption, and even make the road abandoned. The dusty weather caused by desertification has affected the normal operation of the aircraft.

Take off and land frequently.

Sandstorm activities destroy communication and transmission lines and facilities, and the resulting disasters threaten the safety of residents.

According to monitoring, urban air pollutants in China are mainly tiny particles, which are closely related to desertification.

Dust pollutes people's production and living environment in vast areas and affects people's health.

Desertification has deepened poverty and widened regional disparities. According to the survey, the rural population in China is 1/4.

Living in desertification areas, its per capita agricultural output value is only 34.2% of the national average, which is the eastern part of China.

1/5. The degree of poverty in desertification areas has increased, the development gap has widened, and some places have shouted "Yes".

Survival means combating desertification. "