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Terms in this set (13)
How does soil erosion affect streams and rivers?
Severe soil erosion can clog streams and rivers with sediment.
How does soil erosion damage soil?
Soil erosion removes the nutrient-rich, water holding layer of topsoil.
Name three things farmers can do to reduce soil erosion.
No-till farming, contour farming, terracing, planting shelter belts of trees, and grazing management.
What human activities lead to soil erosion?
Human activities include construction projects, plowing, cutting down forests, removing natural vegetation, and overgrazing sheep and cattle.
Describe the practice of terracing and how it can help to reduce soil erosion.
Terracing is a type of agriculture used on steep slopes. Flat areas much like steps are cut into the slope. Crops are grown in the flat areas. This helps to reduce soil erosion by reducing runoff.
How does contour farming help to reduce soil erosion?
Contour farming helps to reduce soil erosion by slowing the flow of water down fields planted on a slope.
How can overgrazing lead to soil erosion?
When arid land is overgrazed, sheep or cattle can strip an area of nearly all of its vegetation. If all of the vegetation is removed, there is nothing to protect the soil. Without that protection, soil can be carried away by wind and water.
Describe the practice of no-till farming.
Farmers who practice no-till farming do not remove the stalks of plants after they harvest the crop. Instead, they leave the stalks in the ground over the winter. When they plant new seeds the next spring, they leave the old stalks in the soil. The stalks provide protection and cover for the soil, reducing runoff and erosion.
Why might farmers in Brazil who get their fields by clearing rainforests need to clear new fields after only a few years?
In tropical forests, the nutrient rich topsoil is only centimeters deep. When forests are cleared, the soil is exposed to wind and rain. The thin layer of topsoil is quickly eroded in fields cleared from rain forests. When the topsoil is gone, plants won't grow well and the farmer may be forced to clear new fields for his crops.
Why is it important to prevent soil erosion?
Plants cannot live without soil. It is important to prevent soil erosion to ensure that plants and crops have rich topsoil in which to grow.
Method for reducing soil erosion, plant stalks are often left in the field after harvesting and the next years crop is planted within the stalks without plowing.
Planting along the natural contours of the land to reduce soil erosion.
Farming method used to reduce erosion on steep slopes.
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