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Difficulty: HardSoils, Natural Vegetation, and Agriculture in India

Arrange the following natural vegetation belts found in the Indian Himalayan region in increasing order of their altitudinal zones (from lowest elevation to highest elevation):

  1. 1Sal (Shorea robusta) dominant subtropical foothill forests
  2. 2Wet temperate broad-leaved Oak (Quercus) and Chestnut forests
  3. 3Moist temperate coniferous Deodar (Cedrus deodara) forests
  4. 4Sub-alpine Silver Fir (Abies) and Birch (Bhojpatra) timberline forests

Answer

The correct sequential order from lowest to highest elevation is: Sal dominant subtropical foothill forests, followed by Wet temperate broad-leaved Oak and Chestnut forests, then Moist temperate coniferous Deodar forests, and finally Sub-alpine Silver Fir and Birch timberline forests.
In the Indian Himalayas, vegetation changes systematically with increasing altitude due to drop in temperature: Subtropical Sal foothill forests (up to 1,000 m) -> Wet temperate broad-leaved Oak/Chestnut forests (1,000–2,000 m) -> Moist temperate coniferous Deodar forests (1,800–3,000 m) -> Sub-alpine Silver Fir/Birch timberline forests (3,000–4,000 m).

Step-by-Step Solution

1
Identify the altitudinal boundary for foothill vegetation.
Sal forests inhabit the subtropical foothill and Shiwalik region up to approximately 1,000 meters elevation.
Sal requires warm subtropical climatic conditions present only at the base of the mountain range.
2
Identify the altitudinal zone for broad-leaved temperate species.
Broad-leaved wet temperate species like Oak and Chestnut dominate between 1,000 meters and 2,000 meters.
This zone features cool temperatures and moderate rainfall ideal for evergreen broad-leaved trees.
3
Identify the altitudinal zone for temperate conifers.
Deodar forests thrive in the cool temperate coniferous belt between 1,800 meters and 3,000 meters.
Needle-leaf coniferous trees adapt well to cold temperatures and snowfall in the middle Himalayas.
4
Identify the altitudinal boundary for sub-alpine timberline vegetation.
Silver Fir and Birch form the highest tree zone between 3,000 meters and 4,000 meters before transitioning into alpine meadows.
Birch (Bhojpatra) and Silver Fir represent hardy sub-alpine species capable of enduring harsh alpine conditions near the timberline.

Key Concept

Altitudinal Zonation of Himalayan Vegetation Belts
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Topics

Soils, Natural Vegetation, and Agriculture in India

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