why the leaves of Himalaya trees are are long and pointed?
Answers
Answer: Himalayan vegetation can be broadly classified into four types—tropical, subtropical, temperate, and alpine—each of which prevails in a zone determined mainly by elevation and precipitation. Local differences in relief and climate, as well as exposure to sunlight and wind, cause considerable variation in the species present within each zone. Tropical evergreen rainforest is confined to the humid foothills of the eastern and central Himalayas. The evergreen dipterocarps—a group of timber- and resin-producing trees—are common; their different species grow on different soils and on hill slopes of varying steepness. Ceylon ironwood (Mesua ferrea) is found on porous soils at elevations between 600 and 2,400 feet (180 and 720 metres); bamboos grow on steep slopes; oaks (genus Quercus) and Indian horse chestnuts (Aesculus indica) grow on the lithosol (shallow soils consisting of imperfectly weathered rock fragments), covering sandstones from Arunachal Pradesh westward to central Nepal at elevations from 3,600 to 5,700 feet (1,100 to 1,700 metres). Alder trees (genus Alnus) are found along the watercourses on the steeper slopes. At higher elevations those species give way to mountain forests in which the typical evergreen is the Himalayan screw pine (Pandanus furcatus). Besides those trees, some 4,000 species of flowering plants, of which 20 are palms, are estimated to occur in the eastern Himalayas.
western Himalayas
western Himalayas
Birch trees in the western Himalayas, Jammu and Kashmir state, northern India.
Ardea London
With decreasing precipitation and increasing elevation westward, the rainforests give way to tropical deciduous forests, where the valuable timber tree sal (Shorea robusta) is the dominant species. Wet sal forests thrive on high plateaus at elevations of about 3,000 feet (900 metres), while dry sal forests prevail higher up, at 4,500 feet (1,400 metres). Farther west, steppe forest (i.e., expanse of grassland dotted with trees), steppe, subtropical thorn steppe, and subtropical semidesert vegetation occur successively. Temperate mixed forests extend from about 4,500 to roughly 11,000 feet (1,400 to 3,400 metres) and contain conifers and broad-leaved temperate trees. Evergreen forests of oaks and conifers have their westernmost outpost on the hills above Murree, some 30 miles (50 km) northwest of Rawalpindi, in Pakistan; those forests are typical of the Lesser Himalayas, being conspicuous on the outer slopes of the Pir Panjal, in Jammu and Kashmir state. Chir pine (Pinus roxburghii) is the dominant species at elevations from 2,700 to 5,400 feet (800 to 1,600 metres). In the inner valleys that species may occur even up to 6,300 feet (1,900 metres). Deodar cedar (Cedrus deodara), a highly valued endemic species, grows mainly in the western part of the range. Stands of that species occur between 6,300 and 9,000 feet (1,900 and 2,700 metres) and tend to grow at still higher elevations in the upper valleys of the Sutlej and Ganges rivers. Of the other conifers, blue pine (Pinus wallichiana).
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