土地沙漠化的原因英文?

英語作文 防止土地沙漠化

Nearly one-fifth of China's land has become

desertified due to natural and human factors,forestry chiefs said

yesterday.

A national survey reveals areas now classified as "sandy land" top

1.74 million square kilometers-affecting 18.2 per cent of the

country's total territory at the end of 1999.

This represents a net increase of 17,180 square kilometers of sandy

land--which is the transitional state of soil before it prevents

any cultivation--in just five years,the State Forestry

Adiministration(SFA) said.

Distribution covered almost all of China's provinces, with 97 per

cent concentrated in 10 arid or semi-arid provinces and autonomous

regions in the west.

China's deserts witnessed a net increase of 52,000 square

kilometers between 1995-1999.

Now six national programs have heen launched by the government to

halt the spread of deserts.rehabilitate ecosystems in semi-arid

areas and prevent more dry land from turning into sandy soil or

desert-like areas.

These projects are designed to cover more than 85 per cent of

China's sandy land to form a framework for the country's long-term

strategy of controlling desertification.

The National Afforestation Committee(NAC) yesterday honored

individual and organization for their outstanding efforts in

controlling the spread of sandy land.

Shi Guangyin and 100 other individuals plus 100 units engaged in

afforestation were commended by forestry and personnel authorities

at a ceremony in Beijing......

英文，沙漠化，急用！？？謝謝了！！！

Desertification is the degradation of land in arid and dry areas,供resulting from human activities and influenced by climatic variations.The primary reasons for desertification are overgrazing, over cultivation, increased fire frequency, overdrafting of groundwater, increased soil salinity, and global climate change.A major impact of desertification is loss of productive capacity. In Africa, for instance, if current trends of soil degradation continue, the continent might be able to feed just 25% of its population by 2025. Desertification is also widespread in many areas of China. The populations of rural areas have rapidly increased. While there has been an increase in livestock, the land available for grazing has decreased. Also the importing of European cattle, which have higher food intakes, has made things worse. A number of solutions have been tried in order to reduce the rate of desertification and regain lost land. Oases and farmlands in windy regions can be protected by planting tree fences or grass belts. Sand that manages to pass through the grass belts can be caught in strips of trees planted as wind breaks 50 to 100 meters apart adjacent to the belts. Small plots of trees may also be scattered inside oases to stabilize the area. On a much larger scale, a "Green Wall of China", which will eventually stretch more than 5,700 kilometers in length, nearly as long as the Great Wall of China, is being planted in north-eastern China to protect "sa......

"土地沙漠化"用英語怎麼說?

Land desertification

英文簡述沙漠化的危害及影響力

Desertification is a global issue, with serious implications worldwide for biodiversity, eco-safety, poverty eradication, socio-economic stability and sustainable development.

Drylands are already fragile. As they become degraded, the impact on people, livestock and environment can be devastating. Some 50 million people may be displaced within the next 10 years as a result of desertification.

The issue of desertification is not new though — it played a significant role in human history, contributing to the collapse of several large empires, and the displacement of local populations. But today, the pace of arable land degradation is estimated at 30 to 35 times the historical rate.

Some two billion people depend on ecosystems in dry land areas, 90% of whom live in developing countries.

A downward spiral is created in many underdeveloped countries where overpopulation causes pressure to exploit drylands for farming. These marginally productive regions are overgrazed, the land is exhausted and groundwater is overdrafted.

When rural land becomes unable to support the local population the result is mass migrations to urban areas.

The increased frequency and severity of droughts resulting from projected climate change is likely to further exacerbate desertification.