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Pandit Govind Ballabh Pant Memorial Lecture: II

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languages from Pusthu to Kashmiri, Himachali, Kumaoni, Garhwali, Napalese and<br />

Tibetan and mixtures in between. All people from the Himalaya, irrespective of their<br />

caste, creed and religion, believe that the mountain system is a living, dynamic and<br />

continuing system with which is irrevocably intertwined the destiny of Indian<br />

subcontinent and its people.<br />

Climatic Diversity<br />

3<br />

Climatically Himalaya is very diverse on account of variation in topography,<br />

elevation and overall monsoon pattern. Basically, the monsoons are the result of<br />

temperature differential created by incoming solar radiation between land and sea. The<br />

land mass is heated up during summer, as compared to sea, both in the east and<br />

south. This results in low pressure areas and moist air moves towards land. The<br />

monsoon starts in first week of June in the Eastern Himalaya and then moves<br />

westward and showers rain almost on the whole range upto September every year.<br />

The high Western Himalaya and the valley in that region do not receive adequate<br />

monsoon. The post-monsoon period is rather dry, followed by western disturbance in<br />

winter months is the source of precipitation in the Eastern Himalaya, while the western<br />

disturbances are the source of snow in winter months in the Western Himalaya. This<br />

being the overall climatic pattern of the Himalaya which has its own local variation,<br />

resulting in varied climatic patterns. Based on geographic physiographic factors, there<br />

are five climatic zones in the Himalaya as affected by altitude. These are : Warm<br />

Tropical (8000m); Warm subtropical (800-1200m); Cool Temperate (1200-2400m);<br />

Alpine (2400-3600m); and Arctic (3600m and above).<br />

While these are only broad zonations, there are many local variations as a<br />

result of variable precipitation, temperature, wind patterns, humidity, radiation etc.<br />

Rock and Soil Diversity<br />

4<br />

The rock profiles of Himalaya are very varied in different zones, namely Siwaliks,<br />

outer and Greater Himalaya and the Trans- Himalayan zone. Rock formulation has<br />

been discussed in detail by Wadia (1975) and Krishnan (1974). In contrast to this, soils<br />

of Himalaya have not received any worthwhile attention. There are fragmentary<br />

reports, and only Brown Hill soils of Siwaliks have been studied to some extent. There<br />

is need to start a systematic study on the soils o f the Himalaya in order to close the<br />

gap in knowledge in this important area.<br />

7

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