Arid soils are typically slightly alkaline, with a pH generally ranging from 7.8 to 8.6.
Characteristics of Arid and Semi-Arid Soils
Arid and semi-arid regions cover approximately one-fourth of the Earth's land surface. The soils in these vast areas possess distinct characteristics shaped by low rainfall and high evaporation rates. Unlike soils in humid climates that tend towards acidity, soils in arid environments are predominantly alkaline.
This alkaline reaction is a defining feature, contributing to their specific chemical and physical properties.
One of the key reasons for the higher pH is the significant accumulation of certain minerals. The reference highlights that soils of these regions are generally characterized by:
- Their slightly alkaline reaction (pH 7.8 – 8.6)
- Elevated accumulation of calcium- and magnesium-carbonates
- Elevated accumulation of sulphates
These accumulated salts and carbonates buffer the soil towards a higher pH range.
Arid Soil pH Range
Based on the reference, the typical pH range for arid and semi-arid soils is specifically defined:
| Soil Type | Typical pH Range |
|---|---|
| Arid and Semi-Arid | 7.8 – 8.6 |
This range indicates that arid soils are not neutral (pH 7.0) but fall into the alkaline spectrum.
Key Features of Arid Soils
In summary, the soils found in arid and semi-arid climates are characterized by several important aspects:
- High pH: Generally alkaline, ranging from 7.8 to 8.6.
- Mineral Accumulation: Often contain elevated levels of calcium carbonates, magnesium carbonates, and sulphates due to limited leaching.
- Location: Found in regions covering about one-fourth of the global land surface.
Understanding the pH and mineral content of arid soils is crucial for agricultural management, irrigation practices, and environmental studies in these regions.
