Körskador i gallring : en studie av 21 drabbade objekt i södra Sverige

Sammanfattning: To guarantee the customers a job satisfactory executed Sydved has been certified by the ISO 14001 standard. One part of the certification is the standards of soil damages. The soil damages were over represented during 1999 and 2000. It was therefore a need to study the problem in order to see what could be done to reduces these damages. A filed study was carried out on 21 subjectively selected stands from the following five districts: Vänersborg, Falköping, Borås, Jönköping and Åseda. As the study is a descriptive study of the soil damages, their character and extension, only stands were tracks were reported were considered. Therefore, the study gives no representative picture of the normal thinning performed by Sydved. To find out if it was possible to improve the planning procedures interviews were made with one machine operator from each district and district managers The average age on the stands was 55 years. The most common type of forest was Norway spruce stands Pice Abies. The average siteindex was G29. The most frequent type of ground vegetation was ground whiteout vegetation. The average track size had a depth of 23 cm and a length of 7.1 meters. The results of the inventory shows that only in 3 out of 21 stands more than 40% of the thinning roads were effected by tracks, and that in twelve of the stands less than 20% were effected. The conclusion is therefor that even in the stands that are reported as damaged only parts of the stands are effected. The results from the interviews shows that the district managers and machine operators agree on what could be done to reduce the number of stands whit tracks. While the machine operators stress the importance of getting the orders in advance, the district managers emphasize the importance of joint ownership, instead of one owner of the forwarder and one owner of the harvester. Although Sydveds standards on soil damages are high, and sometimes considered as hard to achieve, they are realistic. Sydved could continue to work with them, but a more accurate way to judge the level of soil damage would be to measure the relative length of the tracks. However, this method is time consuming if it is to be done on every single stand.