3.2. Land Resources

Landforms such as hills, valleys, plains, river basins and wetlands include different resource generating areas that the people living in them depend on. Many traditional farming societies had ways of preserving areas from which they used resources. If land is utilized carefully it can be considered a renewable resource. The roots of trees and grasses bind the soil. If forests are depleted, or grasslands overgrazed, the land becomes unproductive and wasteland is formed. Intensive irrigation leads to water logging and salinization, on which crops cannot grow. Land is also converted into a non-renewable resource when highly toxic industrial and nuclear wastes are dumped on it. Land on earth is as finite as any of our other natural resources. While mankind has learnt to adapt his lifestyle to various ecosystems world over, he cannot live comfortably for instance on polar ice caps, on under the sea, or in space in the foreseeable future.

Land is a vital resource that encompasses various landscapes such as hills, valleys, and wetlands. These areas provide resources that local populations depend on for their livelihood. Sustainable practices by traditional farming societies help preserve these lands. If managed properly, land can renew itself over time. The roots of vegetation, like trees and grasses, help hold the soil together, preventing it from becoming degraded. However, practices like deforestation or overgrazing can lead to wastelands where nothing can grow. Intensive irrigation can also cause water logging and the build-up of salts (salinization), both of which render land unusable. Moreover, the dumping of toxic wastes can permanently ruin land, turning it into a non-renewable resource. Essentially, land is a limited resource, and while humans can thrive in different ecosystems, there are extreme environments, like polar regions, where survival is virtually impossible.

Consider a garden at home. When you tend to it by watering, pruning, and fertilizing, it thrives and produces beautiful flowers and vegetables. However, if you neglect it and let weeds overrun the space, or if you dump trash in it, the garden can quickly become a barren patch of land. This analogy illustrates how careful management can lead to sustainable land use, while neglect or harmful practices can lead to degradation.

Land degradation can be defined as any change in the land that alters its conditions or reduces its quality. Land degradation occurs due to both natural disasters like volcanic eruptions, earthquakes, heavy rains, fire etc or human induced activities. The other causes of land degradation consist of wind blow, salinity of water, water logging, soil acidity, loss of flora and fauna. Desertification is land degradation occurring in the arid, semi-arid regions of the world. These dry lands cover about 40% of the earth’s surface and puts at risk more than 1 billion people who are dependent on these lands for survival.

Land degradation refers to the deterioration of the land's natural quality or its ability to support life. It can happen due to natural phenomena such as volcanic eruptions, earthquakes, and heavy rains. However, human actions like deforestation, overgrazing, and pollution also significantly contribute to land degradation. When the soil becomes less fertile or contaminated, it can't support plants or crops effectively. Desertification is a severe form of land degradation that occurs in dry regions and threatens a vast number of people, as these lands are essential for their survival. With drylands covering 40% of the Earth, the risk of desertification has become a major concern for food security and biodiversity.

Imagine a sponge that is very porous; it can absorb water well. If you keep dropping sand on the sponge (representing pollution or degradation), it starts to lose its ability to hold water. Eventually, if you continue this process, the sponge becomes a solid block (representing land that can no longer support plant life). Similarly, our land, when degraded, loses its ability to support plants and animals, leading to severe ecological consequences.

The methods that are followed for the prevention of land degradation are called soil conservation methods. Some of the popular methods are; (a) Contour farming: The land is prepared with alternate furrows (a long narrow cut in the ground) and ridges at the same level. The water is caught and held in furrows and stores which reduces run off and erosion. (b) Mulching: Stems of maize, cotton, tobacco etc are used as a mulch (decay of leaves) to reduce soil moisture, evaporation. (c) Crop rotation: Growing the same crop year after year depletes the nutrients and land becomes unproductive. This is overcome by changing the crops and cultivating legumes (plants like peas, beans) after a regular crop. (d) Strip cropping: It consists of planting crops in rows or strips along contours to check the flow of water.

Soil conservation methods are essential techniques used to protect and maintain soil health and prevent degradation. These methods include contour farming, where land is plowed along the contours of the land to capture water; mulching, which helps retain soil moisture by covering it with organic materials; crop rotation, which involves changing the type of crop grown in a specific area to maintain soil nutrients; and strip cropping, where crops are planted in alternating rows to reduce soil erosion. Each method targets specific issues related to soil and water management, helping to preserve land for future generations.

Think of a farmer who grows corn every year on the same piece of land. Over time, the nutrients in the soil become depleted. By using crop rotation, the farmer grows soybeans in the next planting season, which helps replenish those nutrients. This is similar to how rotating tasks in a classroom keeps students engaged and learning, rather than doing the same boring assignment over and over.

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