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单词 soil erosion
释义
soil erosion

Biology
  • The removal and thinning of the soil layer due to climatic and physical processes, such as high rainfall, which is greatly accelerated by certain human activities, such as deforestation. Soil erosion can lead to a loss of agricultural land and if unchecked, eventually results in desertification. Careful soil husbandry and appropriate cropping practices are essential to prevent soil erosion. Measures include the planting of shelter belts to reduce wind erosion of soil; terracing and contour ploughing to retain soil on hill slopes; the use of cover crops where otherwise the soil surface would be bare, e.g. between crops; and minimal cultivation to help maintain the network of plant roots that is vital for stabilizing the soil.


Geography
  • The removal of the soil by wind and water and by the mass movement of soil downslope. The wind erosion is by deflation; water erosion takes place in gullies, rills, or by sheet wash; downslope mass movement ranges from soil creep to landslides. For methods in soil erosion budgeting, see Stolz et al. (2012) Holocene.

    Accelerated soil erosion is erosion increased by human activity. Causes include: wind, tillage (NSR Report for DEFRA); and continuous cropping (Jaiyeoba (2003) Soil & Till. Res. 70, 1). However, Ives (1991) New Scientist 1764 disputes a link between deforestation and soil erosion, and Rowntree et al. (2004) Land Degrad. & Dev. 15, 3 doubt the claim that overgrazing leads to soil erosion. War (as a result of agricultural intensification and the use of marginal land, or of ‘scorched earth policies’), fire, urbanization, and mining also accelerate soil erosion; see Robichaud (2005) Int. J. Wildland Fire 14 and Limartin in M. Haigh, ed. (2000) on mining. Loughran and Balog (2008) Geogr. Res. 46 record a drop in soil erosion through changing from intensive tillage to none at all. However ‘there is still some way to go before the cause and effect links are sufficiently understood to form a basis of tools for the management of grazing in a way that would minimise erosion and maximise the benefits’ (Thornes (2008) Geogr. Res. 46).

    www.soilerosion.net Erosion data and erosion models.


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