Question

If the mean annual soil temperature is \(8 - 15^\circ\mathrm{C}\) and the difference between mean annual summer and mean annual winter temperature is \(< 5^\circ\mathrm{C}\), then the soil temperature regime is known as

• A. Mesic
• B. Isomesic
• C. Thermic
• D. Isothermic

Hint:

Soil temperature regimes:
- Mesic: 8-15°C, seasonal difference > 5°C.
- Isomesic: 8-15°C, seasonal difference < 5°C.
- Thermic: 15-22°C.
- Isothermic: 15-22°C, seasonal difference < 5°C.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
This question tests knowledge of soil temperature regimes in Soil Taxonomy.

Step 2: Detailed Explanation:
If the mean annual soil temperature is \(8 - 15^\circ\mathrm{C}\) and the difference between mean annual summer and winter temperature is \(< 5^\circ\mathrm{C}\), the soil temperature regime is Isomesic (B).
- Mesic (A): Mean annual soil temperature \(8 - 15^\circ\mathrm{C}\) with seasonal temperature difference \(> 5^\circ\mathrm{C}\).
- Thermic (C): Mean annual soil temperature \(15 - 22^\circ\mathrm{C}\).
- Isothermic (D): Mean annual soil temperature \(15 - 22^\circ\mathrm{C}\) with seasonal difference \(< 5^\circ\mathrm{C}\).
Thus, Isomesic is the correct regime.

Step 3: Final Answer:
Thus, the soil temperature regime is Isomesic, which corresponds to option (B).
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