Images of soil erosion


Frans Kwaad, physical geographer

Soil erosion is the removal of soil from cultivated land at a rate that is (much) higher than the rate that would occur under the natural vegetation at the considered site. Besides the loss of fertile topsoil, soil erosion entails the dissection of cultivated land by rills and gullies and the deposition of eroded soil material on roads, in residential areas, rivers, ponds, lakes and reservoirs, and it can be accompanied by flooding.

Guly erosion is the formation of gullies that are too deep to be removed by normal tillage. Gullies are formed in unconsolidated soil material. Several types of gullies can be distinguished, a.o. valley side gullies, valley bottom gullies, V-shaped gullies, U-shaped gullies, continuous gullies, discontinuous gullies, arroyo’s, badlands. In the picture: gullies in Rif Mountains (Morocco, 40 km west of Al Hoceima).

So, soil erosion not only affects land owners and farmers but also the general public outside agriculture. Soil erosion research started in the 1920’s in the USA. Despite 90 years of research, soil erosion continues to be a serious problem, worldwide. According to Pimentel (2006) the yearly damage of soil erosion amounts to 400 billion US dollars worldwide.

Soil erosion may damage crops (by uprooting, or burial with colluvium). Location of the picture: Zuid-Limburg (The Netherlands).

According to Napier (2012) farmers today know very well which measures to take to combat erosion on their farms. The reasons that they don’t do this, are of an economic nature. Most conservation production systems are seldom profitable in the short-term and, often, not even in the long term, says Napier. We live in a time of economic crisis with reduced public conservation funding, the upcoming of grain-based energy, increased grain prices and an expected mass exodus from land set-aside programs in the USA. No longer can be relied on voluntary participation of farmers in conservation programs. Coercion will be required to achieve such participation. In several European countries ┬ámandatory measures are already in force, e.g. Austria, Belgium, Germany, Italy, Netherlands, United Kingdom.

Piping is the formation of pipes or tunnels by subsoil erosion. Location of the picture: Rif Mountaisn (Morocco, 40 km west of Al Hoceima).

As an aid to lessons and lectures on environmental issues at secondary schools, agricultural colleges and universities, a website was made with 12 series of images of the various forms and manifestations of soil erosion. The URL of the site is: http://home.tiscali.nl/~wr2777/Erosion.htm.

References

  • Napier, Ted L., 2012. US conservation achievements threatened by future prosperity of the agricultural sector. Guest Editorial, ESSC Newsletter, 1/2012, pp. 3-10.
  • Pimentel, David, 2006. Soil erosion: a food and environmental threat. Environment, Development and Sustainability, 8, pp. 119-137.
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About Antonio

I am Graduate in Biological Sciences (1996) and PhD in Biology (2000). I work as researcher and teacher in Soil Science at the University of Sevilla (Spain). During the last years as student at the University, I became involved in some research in the Department of Ecology, working in the wetlands of the Do├▒ana Natural Park (S Spain). In those years, as part of the course on "Phytogeography", I collaborated in some studies and participated in a practical work on the habitat of Drosophyllum lusitanicum, an insectivorous plant growing in poor acid soils in the Strait of Gibraltar, Morocco and Portugal. This got me interested in soils, and I decided to take the course of Soil Science. After that I was more and more involved in the study of soils. I am very interested in soil erosion, hydrological soil processes and fire-affected soils. My on-going work includes the study of hydro-geomorphological responses of burned soils, changes in physical and chemical properties and fire-induced soil water repellency.
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