PowerPoint Presentation: The Clear-strip System may be defined as a silvicultural system in which clear felling is done in the form of strips which progress successively in one direction (usually against the prevailing direction of the wind ) across the regeneration area. As the strip fellings are made progressively in one direction, it is also known as Progressive Strip System. Pattern of felling : The clear-felled strips in this system are separated by unfelled forest of sufficient width which may be a multiple of the width of clear-felled strip. The period after which the unfelled forest adjacent to a clear-felled strip can be felled depends on
PowerPoint Presentation: When natural regeneration is relied upon, completion of regeneration of clear-felled strip which, in turn, will depend on the frequency of seed year and the ease with which regeneration appears from the first seed year after clear-felling; and The period for which protection against adverse factors is required. In order to clear-fell strips in a regular order, keeping in view the above mentioned two considerations, it is usually necessary to divide the regeneration area into as many cutting sections as the number of years after which felling in successive adjacent area can be done. Suppose for instance, the period after which felling in adjacent area can be done is 4 years, the regeneration area will have to be divided into four cutting sections marked 1 to 4, and successive strips arranged as shown in the figure below:
PowerPoint Presentation: Fig . 1. Arrangement of strips in Progressive Strip System.
PowerPoint Presentation: Though all the strips have been shown in this figure in one compact area, it may, if there is not sufficient area in one compartment or sub-compartment, become necessary to spread them over two or more compartments. Where natural regeneration by seed from un-felled forest is to be relied upon, it is necessary that felling may progress against the direction of wind prevailing at the time of seed ripening so that the seed from the unfelled area, may be disseminated on the cleared strip. In each case, the width of the strip will depend on the distance to which the seed can be disseminated by wind so that even the remotest part of the clear-felled strip receives sufficient seed for regeneration, It should, however, be noted carefully that while clear-felling the last strip in a cutting section, a belt of trees should be left on the windward side to serve as seed bearers for the last strip. This belt can be clear-felled later when no longer required and the area regenerated artificially .
PowerPoint Presentation: Method of regeneration. : The strips clear-felled in this system can be regenerated artificially as well as naturally depending on the circumstances. If natural regeneration can be obtained easily in a reasonably short time, it is resorted to; otherwise the strip is regenerated artificially. Character of the crop produced. : The Clear-strip System results in production of even-aged crop, Actually, each strip can be Cutting section - A subdivision of felling series formed with the object of regulating fellings in some special manner. Treated as sub-compartment and can be shown separately on the management map .
PowerPoint Presentation: ADVANTAGES : This system has all the advantages of the Clear-felling System. In addition, it does not deteriorate the site and maintains the aesthetic beauty of the area. DISADVANTAGES : In addition to the general disadvantages of the Clear-felling System, except those of site deterioration and undesirability from aesthetic considerations, it has the following disadvantages: Protection of regeneration in strips is not only difficult but also costly. It is difficult to keep the strips under regeneration fire-protected as the fire in the unfelled forest can easily enter the strips. Similarly, for protecting these strips against grazing, much more fencing material will be required in large clear-felled strips. In case of artificial regeneration, burning of felling refuse in the strips often results in fire spreading to the unfelled forests.