The rain is so abundant that it cannot... Basin and Range topography. New ways are being sought to use surface-water resources such as rain water harvesting or irrigating with seasonal runoff from adjacent highlands. He hoped that over time the vegetation index would reveal whether or not the Sahara was expanding into the Sahel. and any corresponding bookmarks? In the final decades of the twentieth century disastrous droughts in Africa became increasingly common. Satellite measurements of vegetation reveal it as a transition zone between the sands of the Sahara and the jungles of the Congo in the heart of Africa. This degradation of formerly productive land-- desertification--is a complex process.
Field work and higher-resolution (more detailed) satellite data are needed to confirm that desertification is driving the changes that scientists see in the satellite data. bookmarked pages associated with this title.
If the land is desertified, growth will no longer follow the rains. Permanent changes in climate, particularly rainfall, are responsible for natural desertification. Nomads are trying to escape the desert, but because of their land-use practices, they are bringing the desert with them. .
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. The Gobi desert in central China gobbles … It is the spread of arid areas caused by a variety of factors, such as through climate change (particularly the current global warming) and through the overexploitation of soil through human activity. Literature Notes Droughts are common in arid and semiarid lands.
Baobab trees (lower), survive extended droughts by storing water in their bulbous trunks. Conditions could vary widely; healthy vegetation could be growing meters away from barren land. If land is not considered desertified unless the change is permanent, you need to track change over a long period—ten to twenty years at least—to see if vegetation is permanently altered.
If the nutrient-rich top soil blows or washes away, plants may not be able to return.
These transition zones have very fragile, delicately balanced ecosystems.
Desert Features Flash floods. “There is no other way of seeing big enough areas at high enough frequency.” The index’s large scale meant that it would emphasize only widespread desertification. Are you sure you want to remove #bookConfirmation# Human causes of desertification include overgrazing, the buildup of salt in irrigated soils, and topsoil erosion. Prince is given 50 data points—snapshots of vegetation conditions—scattered across the country.“It was the same as putting 50 pin pricks in a map,” Prince recalls. (Map by Robert Simmon, based on “When I saw the vegetation index data, I realized that it was exactly the scale we wanted for studying desertification,” says Prince. Desertification may intensify a general climatic trend toward greater aridity, or it may initiate a change in local climate. By their very nature, arid and semiarid ecosystems are characterized by sparse or variable rainfall. Removing #book# )Although desertification is not occurring across the entire Sahel, it is likely occurring in specific areas.
(Photographs copyright
(Graph adapted from Anyamba and Tucker, 2005.
It involves multiple causes, and it proceeds at varying rates in different climates.
The Earth Observatory is part of the
Most desert rainfall comes from short, violent thunderstorms.
A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. (Photograph copyright When he first saw the vegetation index, Prince realized that it could reveal the condition of Botswana’s range lands in a single glance, and it was frustrating to know that it would be some time before the newly developed product would be ready for anything but experimental use. (Maps and animation by Robert Simmon and Jesse Allen, based on Rainfall tapered off in the Sahel in the early 1970s, and by 1972, the region was in the grip of a drought that would kill millions. It is a Semi-Arid region south of Sahara Desert.
The loss of productive land for a season or even a few years is one thing, but to lose it effectively for ever is clearly far more serious.“If we can agree on this definition, we can quantify [or measure] desertification,” says Sharon Nicholson, a professor of climatology at Florida State University. This map shows vegetation in the final two weeks of June 2005, near the end of the dry season in the Sahel. Most of its landscape has been shaped over time by wind and includes sand dunes, sand seas called ergs, barren stone plateaus, gravel plains, dry valleys, and salt flats. This includes much of the polar regions, where little precipitation occurs, and which are sometimes called polar desertsor "cold deserts". They include hot and dry deserts, semi-arid deserts, coastal deserts and cold deserts. CliffsNotes study guides are written by real teachers and professors, so no matter what you're studying, CliffsNotes can ease your homework headaches and help you score high on exams. About this essay More essays like this: united nations, desertification, reversible process. Photographs from Senegal show the difference in vegetation between the dry (left) and wet (right) seasons. While desertification has received tremendous publicity by the political and news media, there are still many things that we don't know about the degradation of productive lands and the expansion of deserts.
WORDS 1,136. Deserts can be classified by the amount of precipitation that falls, by the temp… For a list of selected deserts of the world, see below. In March, during the dry season, rainfall and lush vegetation don’t extend north of the Gulf of Guinea. In the 1990s and 2000s rainfall levels recovered somewhat, and vegetation returned (green line).
The Earth Observatory is part of the
Small plots of trees may also be scattered inside oases to stabilize the area.
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