Answer:
Desert pavement, also known as reg (from the word "regolith"), refers to a surface covered with closely packed stones or pebbles. This type of surface is found in arid regions and has significant impacts on crop yields and can contribute to famine.
Step-by-step explanation:
Here's why:
1. Limited Water Availability: Arid regions with desert pavement often experience low rainfall and limited water resources. The closely packed stones prevent water from penetrating the ground, leading to poor soil moisture levels. As a result, the availability of water for plant growth is limited, making it difficult for crops to thrive.
2. Soil Erosion: Desert pavement acts as a protective layer, reducing wind erosion and preventing the loss of topsoil. However, this layer also inhibits the natural accumulation of organic matter and nutrients in the soil. Without proper organic content, the soil becomes less fertile, further limiting crop growth and yield potential.
3. High Temperatures: Arid regions with desert pavement are characterized by high temperatures, which can be detrimental to crop growth. The stones in the pavement absorb and radiate heat, intensifying the local microclimate. This excessive heat can cause water stress, affect plant physiology, and reduce crop productivity.
4. Lack of Nutrients: The limited organic matter in the soil of desert pavement areas translates to a lack of essential nutrients for plant growth. Nutrient cycling is disrupted, and the soil becomes deficient in nutrients like nitrogen, phosphorus, and potassium, which are vital for crop development. This nutrient deficiency negatively impacts crop yields and makes it challenging to sustain agricultural practices.
5. Limited Plant Diversity: Desert pavement often supports limited plant diversity, with only a few hardy plant species able to survive in these extreme conditions. This limited plant diversity means there are fewer options for crop selection, reducing the chances of finding suitable crop varieties that can tolerate the harsh environmental conditions.
Due to these factors, areas with desert pavement are prone to famine. The limited water availability, soil erosion, high temperatures, lack of nutrients, and limited plant diversity collectively contribute to the inability to sustain agricultural practices and produce sufficient crops for local populations. This can lead to food scarcity, malnutrition, and ultimately, famine.
It is important to note that these factors may vary in intensity depending on the specific characteristics of the desert pavement area, such as climate, soil composition, and geographical location.