What natural and human causes contribute to desertification in drylands?

Desertification is the process by which natural or human-driven factors reduce the biological productivity of drylands, including grasslands and scrublands. It is important to clarify that this process does not refer to the physical expansion of existing deserts, but rather to the degradation of ecosystems that threatens their long-term viability.1

Natural Causes

Arid and semiarid ecosystems are inherently characterized by sparse or variable rainfall. Climatic variations, particularly extended droughts, can rapidly diminish biological productivity. While these changes may be temporary, they can persist for decades, significantly impacting the environment.2

Human Causes

Unsustainable land-management practices exacerbate these conditions, leading to lasting ecological damage. Key human activities include:2

• Agriculture: Irrigated croplands often suffer from soil degradation due to the accumulation of salts, while rain-fed croplands face wind-driven soil erosion.3
• Grazing: Overgrazing and livestock trampling compact the soil and destroy plant roots, hindering growth and leaving topsoil vulnerable to erosion.34
• Resource Consumption: The overconsumption of fuelwood in dry woodlands leads to deforestation.31
• Socioeconomic Factors: Poverty and political instability can also contribute to the unsustainable use of land resources.1