Decrease in temperature with increasing altitude leads to a corresponding change in natural vegetation.
Explanation
In mountainous regions, altitude acts as a primary determinant of climate. The phenomenon of decreasing temperature with increasing elevation (Normal Lapse Rate) creates distinct vertical climatic zones. This vertical change in climate results in a succession of natural vegetation belts that mirrors the latitudinal transition from the equator to the poles.
Option Analysis
- Increase in altitude leads to increase in temperature, causing a change in vegetation. is incorrect: In the troposphere, temperature decreases with an increase in altitude, rather than increasing. This drop in temperature is the fundamental cause of vegetation zoning.
- Decrease in temperature with increasing altitude leads to a corresponding change in natural vegetation. is correct: The decrease in temperature with increasing altitude leads to a corresponding change in natural vegetation. As altitude rises, the vegetation shifts from tropical to subtropical, temperate, and finally alpine types. For example, in the Himalayas, one observes a transition from deciduous forests at foothills to coniferous forests and then to alpine meadows at higher elevations.
- Vegetation remains uniform up to 3000 meters regardless of temperature changes. is incorrect: Vegetation changes significantly within the 0 to 3000-meter range. For instance, wet temperate forests are typically found between 1000 and 2000 meters, while coniferous temperate forests (Pine, Deodar, Silver fir) dominate between 1500 and 3000 meters.
- Rainfall is the only factor determining vegetation type in mountainous regions, not altitude. is incorrect: While rainfall and slope aspect are important factors, they are not the sole determinants. Altitude and the resulting temperature gradient are the critical factors defining the specific types of vegetation (montane forests) found at different levels.
Key Takeaway: Mountain vegetation exhibits vertical zonation where the decrease in temperature with rising altitude causes a succession of vegetation types, ranging from tropical forests at the base to alpine tundra near the snowline.