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Shelterwood system jyoti ghimire

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  • 1. A Term Paper Presentation on By : Jyoti Ghimire (Biswakarma) Roll No : 20 M.Sc. Forestry (2013-2015)
  • 2. Presentation Outline 1.Introduction 2.Global context 3.Pattern of felling 4.kinds of shelterwood system 5.Advantages 6.Difficulties 7.Conclusions 8.Recommendation
  • 3. Introduction • In shelterwood system, the old stand is removed in a series of cuttings to promote the establishment of a new even-aged stand under the shelter of the old one. • The central theme to shelterwoods is that the overstorey leave-trees are left on site to protect the regenerating understorey until the understorey no longer requires the protection. (www.forestrynepal.org/notes/silviculture-systems/7)
  • 4. Global Context • The shelterwood system evolved during early 19th century from Britain. • First investigated by von Huber in Bavaria (Spurr 1956) • Applied for forest products regulation in ▫ North American continent ( Canada, USA) ▫ British Columbia, India ▫ Strip sheltewood practiced in silver fir in European virgin forest . ▫ In Nepal, partially followed in Kapilvastu.
  • 5. Pattern of felling There are 4 phases of cutting in the shelterwood method • Preparatory cutting • Seed cutting • Removal cutting
  • 6. Pattern of felling cont…. • Preparatory cuttings The purpose of this cut is to remove species that are not desired so that they do not contribute seeds to the establishment cut. If this is not a problem, the preparatory cut is not necessary.
  • 7. Pattern of felling cont.. • Seed cut It opens up the stand, allowing sunlight to reach the forest floor, where it stimulates the germination and growth of seedlings. • Removal cut The removal cut harvests all the mature trees. By giving the saplings full sunlight, the removal cut encourages the rapid growth of a new forest.
  • 8. Pattern of felling cont..
  • 9. Kinds of shelterwood • Uniform system shelter wood system The canopy is uniformly opened up over the whole area of a compartment to obtain uniform regeneration under the shelter of remaining old crop. • Strip shelter wood system Regeneration felling is done in the form of strips successively from one side of the compartment, progressing against the direction of wind. Developed by Wagner (1921), Eberhard (1914).
  • 10. Kinds of shelterwood system cont… Group shelter wood system • Smallest circle for final felling, medium circle for secondary felling, and largest circle for seeding felling are carried out in scattered groups • It was tried in Deodar, Kail and Sal forests in India but was not successful due to management problems.
  • 11. Kinds of shelterwood cont… • One cut shelter wood system Regeneration felling is done in one operation. It is applied only when advance regeneration is well. • Irregular shelter wood system Regeneration felling is on the pattern of group system but as the regeneration period is long, the crop produced is uneven aged or irregular.
  • 12. Shelterwood System Uniform shelter wood system Strip shelter wood system
  • 13. Shelterwood System Group shelter wood system cont..
  • 14. Shelterwood System One cut shelter wood system cont..
  • 15. Shelterwood System Irregular shelter wood system cont..
  • 16. Advantages of the Shelterwood • Soil is not completely denuded so there is little risk of soil deterioration and erosion. • The young crop is protected against adverse climatic factors such as cold, frost, etc. • Suitable system for the regeneration of both light demander and shade bearer spps. • From aesthetic point of view, the system is superior to clear felling.
  • 17. Difficulties in the Shelterwood • As the over wood is removed in more than one operation, there is much damage to the young crop. • Silviculture workers require greater skills than those required in clear cutting: • The isolated seed bearers are susceptible to wind damage.
  • 18. Conclusion The shelterwood system protect and shelter the developing regeneration. The trees which are growing vigorously are retained to provide shelter, Seed, rapid diameter increment and value increment and protection of site against deterioration.
  • 19. Recommendation •Silvicultural system are not as easy as they sound because it requires a long term vision and intervention objectives of a owner/state of forest. •In Nepal, it can be praciticed as a major contributor of national GDP, various benefits and for research purpose.