Land degradation (also called soil degradation, to be more specific) is continuing to grow into a major problem in today’s world. While it does threaten biodiversity and the living standards of other living species, the largest effect of this by far, is on human life. More importantly, land degradation has seriously taken a toll on the economic prosperity of many parts of the world. Africa and Asia continue to be the worst affected regions.
Plenty of research has gone into how to overcome land degradation. Some involve simple management practices, while other methods involve use of sophisticated technologies. Let’s take a look at the most popular and effective methods to overcome land degradation…
- The first and the most important step is to reduce all activities that cause land degradation in the first place. This includes deforestation, overgrazing, improper agricultural activities, mining, etc. Simply reducing the extent of these activities will prevent further land degradation.
- Since soil erosion is seen as the largest cause of land degradation, efforts should be made to prevent this. This is just as well; soil is effectively a non-renewable resource and takes thousands of years to replenish. There are many ways in which soil erosion can be prevented-
1. Afforestation- Areas prone to soil erosion can be planted with trees; especially trees that have a high root-shoot ratio and show high soil binding capacity. In fact,it doesn’t just have to be trees. Degraded lands around you can be improved by creating lawns and planting small plants as well. The results will be the same.
2. Reforestation- The difference is that here, we are regrowing a previously deforested area. This can reclaim much of the land before it is completely lost.
- Agricultural losses amount to some of the largest losses of valuable land. Certain agricultural practices can contain soil erosion very effectively. They are-
1. Terrace farming- this method of farming is done in areas of steep slopes. It acts as a break for flowing water, and consequently reduces the speed of flow. When this gets reduced, it drastically brings down the chances of rill and gully erosion.
2. Mulching- This is effective for wind as well as water erosion. Mulch is a layer of crop stubble, that is added as a protective layer over soil. It covers the soil and prevents evaporation and improves the organic matter of the soil. It also allows water to flow over it and keeps the soil underneath safe.
3. Contours and strip farming- This involves planting of crops perpendicular to the direction of flow of water, to keep the flow in check. It has proved to be very effective in controlling soil erosion.
4. Wind breaks- This is an agroforestry method of preventing soil erosion. Wind breaks are trees that are planted on the edges of agricultural land, that divert the direction of wind away from the fertile soil. The action of windbreaks work something like the picture below.
- Since we aren’t going to stop eating meat anytime soon, it’s highly recommended that we change our grazing practices. One of the biggest reasons of overgrazing is the fact that cattle are not moved fast enough, causing them to graze the land to the roots. This removes all signs of vegetation and also all chances of a natural regeneration. Rangers need to ensure that they move their cattle swiftly after they have had as much as they should from a particular part of the land. This will allow pastures to regenerate.
- Increased focus on non-wood products and non-wood substitutes to wood products will reduce pressure on deforestation practices.
- It wouldn’t be a bad idea to do what a billionaire American did; buying patches of forest land and protecting it from people who want to cut it down!
- Irrigation practices have been a major issue in tackling land degradation. Over irrigation of land has not only increased soil erosion, it has also taken many of the fertilizers and pesticides into water resources and causing water pollution and biomagnification. Irrigation should be closely monitored and should be optimal for each crop produced. Advanced irrigation practices like sprinklers and drip irrigation can be employed to ensure the land is not over-irrigated.
- It is also highly advisable to stick to organic sources to improve soil fertility and productivity. Fertilizers and pesticides have been a huge cause of increasing soil salinity and alkalinity and destroying perfectly good soil.
- Flood control measures. Especially when agricultural land or commercially important land is present along the floodplains, simple flood control measures like levees can go a long way in preventing erosion and land degradation.
- Spreading awareness of the dangers of land degradation in urban areas and urban authorities will ensure that mindless city expansion is not done. Often, land degradation in city-fringes is caused because builders see it is land with great “future prospects”. Land for such expansion should be carefully evaluated before selection.
Consider these 10 measures the magic 10 for controlling and preventing land degradation!