Downloaded 801 times
More Related Content
Similar to Forests of Pakistan {importance, types, causes and effects}
Forests of Pakistan {importance, types, causes and effects}
- 1.
- 2. Table of Contents •Forests • Importance of Forests • Types of Forests (in Pakistan) • Deforestation in Pakistan ( Causes, Effects and solution) • Sustainable Forestry
- 3. Forests • Forests areextensive, continuous areas of land dominated by trees. The desired level of forests is 20-30 percent of the total area of a country. In Pakistan only about 4.8 % of the total area is forested. There are two types of forests in Pakistan. • Productive Forests • Protection Forests • Productive Forests: These are mainly natural forests and have high tree densities. Such forests have great commercial value and are mainly used for extraction of timber and other products. • Protection Forests: These forests are mainly planted by people. They include planting along roads, in parks and along railway lines. Protection forests have little commercial values as they do not provide valuable species of wood. There main function is to prevent soil erosion.
- 4. • From anecological point of view, forests help to maintain a balance in the environment by checking pollution and protecting soil from erosion. • By preventing soil erosion, the trees on slopes of hills also regulate the supply of water to the reservoirs thereby reducing floods. • Decomposition of leaves helps in humus formation, which maintains the fertility of the soil. This ensures food supply to millions of people. • From a commercial and industrial point of view, forests provide raw materials to various industries. They also promote tourism and provide employment in the forest department. • Forests help in preventing global warming. Increased amount of carbon dioxide (greenhouse gas) in the atmosphere results in greenhouse effect and thus causes global warming. • Forests help in preventing global warming. Increased amount of carbon dioxide in the atmosphere results in greenhouse effect and thus causes global warming. Importance of Forests
- 5. Types of Forests AlpineForests: These forest are called alpine because they grow in conditions similar to those in the Alps, a mountain range in Europe. • Alpine forests are found on the mountains of Gilgit-Baltistan. In the region of high mountains there is snow, so little or no vegetation is found here. • Due to the very cold climate above a height of 4000 metres, trees do not grow properly. Some dwarfed trees of silver fir, juniper, and birch grow here. Alpine forests are found in a limited area in Chitral, Dir, Swat, and Gilgit. • They normally have upward branches to attain more sunlight. • They are used as fuel wood only. • Tropical Thorn Forests: The tropical thorn forests are dominated by xerophytic scrubs. They are most widespread in the Punjab plains but also occupy small areas in southern Sindh and western Balochistan. They are mainly used for grazing purposes, watershed protection and fuelwood. The usual height is 6-9 m. • This is the natural vegetation over the whole of the Indus Plains except for the driest parts. It merges into the subtropical dry evergreen type of the lower hills to the north and West generally. • They have deep roots to search for water.
- 6.
- 7. Tropical Thorn Forest(Thar Desert)
- 8. Coniferous Forests: Theconiferous forests occur from 1,000 to 4,000 m in altitude. Chitral, Swat, Upper and Lower Dir, Malakand, Mansehra and Abbottabad, districts of Khyber Pakhtunkhwa, Azad Kashmir, Rawalpindi and districts of the Punjab are the main areas covered with coniferous forests. • Coniferous forests are evergreen which survive in low temperature. They are important source of timber for making furniture and boxes. • They are conical in shape and have sloping branches which prevent snow accumulation. • These type of forests are good breeding and conserving centres for birds and wildlife. • Coniferous forests add to the scenic beauty of the area, attract tourists and promote tourism industry. Sub-Tropical Scrub Forest: Commonly these are known as scrub forests. These forest consist of branchy trees forming a canopy if complete closure or scattered trees with a shrub growth. • These trees and shrubs are mostly thorny and evergreen, but some ,like olive and pomegranate are not thorny. • These scrub forest occurs at height of 1500-5000 feet. These forests found in Gujrat, Margalla Hills, Attock and Malakand. Actually broadly speaking, these forests occur throughout the country at suitable elevation merging downwards with the sub-tropical pine forest. • They are used for grazing purposes and for supplying firewood.
- 9. View of 'FairyMeadow' at Nanga Parbat showing coniferous forest
- 10.
- 11. Mangrove Forests: Mangrovesare slat tolerant bush type trees which grow in inter-tidal zones of tropical and subtropical areas, river deltas and along the coasts. • Mangroves forests of Pakistan in Indus delta and along Arabian Sea coastal areas, as per estimates, are some 129,000 hectors in the Indus delta and over 3,000 hectors in Gwadar bay areas. • They are natural habitat to a large number of insects, micro organisms, birds, different mammals as well as snakes. Mangrove areas act as physical breeding grounds and nurseries for fish, shrimp and crabs. During winters, many guest birds from north also come to breed here. • The mangrove forests protect the coasts from dangerous cyclones and hurricanes. Mangroves slow the water’s flow, helping to protect the coastline and preventing erosion. • They have broad leaves and leathery texture to minimize transpiration. In better water areas the trees rise to 6-8 metres but their general height is 3 metres. • Mangroves are suppliers of firewood and timber for local communities. Riverain Forest: The riverine forests occur in the province of Sindh along both banks of the Indus River. They rely on inundation by the River for irrigation and therefore their existence is heavily dependent on the intensity, duration and frequency of river water flow. • They provide Shishum and Babul, two valuable species which are used for making furniture.
- 12.
- 13.
- 14. Irrigated Forests: Theseare man made forests. They include plantation along roads, in parks and along railway lines. • Their main function is to protect the soil and to prevent it from eroding. They keep the environment pleasant by lowering the temperature and providing shade. • They are important source of timber and firewood. Eucalyptus is mainly preferred as they reduce waterlogging and salinity. • They also add to the scenic beauty of the area and promote tourism. Leaves of trees provide food for animals. • Forests absorb carbon dioxide and release oxygen into air
- 15. Deforestation Clearing of forestland is called deforestation. Pakistan is not self-sufficient in wood based products and spends billions of rupees on import of wood and wood based products. Pakistan’s forest resources are shrinking at a rate of one percent which will have dreadful effects on the people of Pakistan. Following are some of the main causes of this large scale deforestation in Pakistan. • Clearing of land: Due to the construction of dams and barrages to supply water to crops on millions of hectors, most of the forest land is cleared. These construction of barrages also serve as a cause of deforestation. • Urbanization: Sprawling growth of cities has converted forests into cities thus losing the forest or decrease in forest area. • Building of Roads: Building of roads in order to have access to the far flung areas has also caused deforestation especially in areas of Kohistan and Northern areas. • Industrialization: The increase in demand of industries has also caused deforestation as most of the industries require wood as their fuel. Wood industries such as hard wood and safety match box, Plywood etc have also played their part in deforestation. • Overgrazing: Overgrazing of land by cattle, sheep and goats have converted subtropical, and tropical thorn forest areas into deserts.
- 16. Clearing of LandOvergrazing Building of Roads Industrialization
- 17. Effects of Deforestation Recklesscutting of trees for firewood or any other commercial purposes can result in deforestation. The effects of this are extremely harmful and can result in destruction of environment and loss of food and resources. • Deforestation exposes the soil to the forces of wind and water which results in soil erosion. • With less vegetation the climate changes, resulting in less rainfall which may lead to lower crop yields. • Many wonderful species of plants and animals have been lost, and many others remain endangered. More than 80% of the world's species remain in the Tropical Rainforest. • It is estimated that about 50 to 100 species of animals are being lost each day as a result of destruction of their habitats.
- 18. Solution to theproblem caused by Deforestation The following measures could be helpful to solve the problems caused by deforestation. • Supplying irrigation facilities to the deforested areas. Commercial species of trees, which grow rapidly, should be planted. • By reserving land for fuel wood plantation only, so the valuable species of trees could be saved. • Creating awareness among the people by NGO’s about the hazards of deforestation. • By improving the techniques of raising nurseries and planting trees, so the deforested areas could be regenerated in a short period.
- 19. Sustainable Forestry • Sustainableforestry means that we should manage the forest resources in such a way as to ensure that we will be able to obtain the things that we want from the forests on a regular basis while conserving the natural environment. • It implies continuous production of things; such as wood, water, wildlife habitat, recreational opportunities and so on.