mention how to preserve the desert
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Answer:
Remedies for Prevention of Desertification
Remedies for desertification: 1) trapping rainwater with earth mounds between rows of plants or rock walls built along hill contours; 2) shallow ditches arranged in a pattern to trap rainwater; 3) terracing and plow techniques that halt erosion; 4) planting grasses and other plants in a checkerboard pattern to prevent erosion.
At the local level, individuals and governments can help to reclaim and protect their lands. In areas of sand dunes, covering the dunes with large boulders or petroleum will interrupt the wind regime near the face of the dunes and prevent the sand from moving. Sand fences are used throughout the Middle East and the United States, in the same way snow fences are used in the north.
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," which will eventually stretch more than 5,700 kilometers in length, much longer than the famous Great Wall, is being planted in northeastern China to protect "sandy lands"--deserts believed to have been created by human activity.
More efficient use of existing water resources and control of salinization are other effective tools for improving arid lands. New ways are being sought to use surface-water resources such as rain water harvesting or irrigating with seasonal runoff from adjacent highlands. New way's also being sought to find and tap groundwater resources and to develop more effective ways of irrigating arid and semiarid lands. Research on the reclamation of deserts also is focusing on discovering proper crop rotation to protect the fragile soil, on understanding how sand-fixing plants can be adapted to local environments, and on how grazing lands and water resources can be developed effectively without being overused.
If we are to stop and reverse the degradation of arid and semiarid lands, we must understand how and why the rates of climate change, population growth, and food production adversely affect these environments. The most effective intervention can come only from the wise use of the best earth-science information available.
Researchers are experiments with drought-resistant crops, desert agriculture techniques and using plants, shrubs and grasses to stabilize dunes.
Answer:
We can more efficiently use existing water resources and better control salinization to improve arid lands, find new ways to rotate crops to protect the fragile soil, and plant sand-fixing bushes and trees.
Planting leguminous plants, which extract nitrogen from the air and fix it in the ground, can help restore soil fertility. People can also use off-road vehicles only on designated trails and roadways and dig artificial grooves in the ground to retain rainfall and trap windblown seeds.
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