Uszkodzenia gleby w drzewostanach sosnowych przy pozyskiwaniu drewna w praktyce leśnej

Autorzy

• Marian Suwała Instytut Badawczy Leśnictwa, Zakład Użytkowania Lasu, Sękocin Stary, 05-090 Raszyn, Poland, fax +48 227153557, e-mail: m.suwala@ibles.waw.pl

Abstrakt

Work includes research results on soil disturbances during wood harvesting in thinnings and group clearcutting in forestry practice. Cut-to-length (CTL) and long wood methods were taken into account in the research. In each method two technological processes were distinguished, differing mainly in technical means. Results indicate that in thinnings CTL method with a chain saw and a forwarder or a farm tractor with a trailer and a crane and whole-stem method with a chain saw and a horse are characterized by smallest soil disturbances (synthetic index of disturbances: in early thinnings – 2.3 and 3.3% respectively; in late thinnings – 2.8 and 2.2%). Soil disturbances when using a harvester and a forwarder turned out to be bigger (index 4.9 and 5.1%). Presumably soil humidity (small disturbances in very dry soil during research in late thinnings) had influence on big differences in soil disturbances when using a chain saw and a farm tractor with a winch in early and late thinnings (index – 9.1 and 1.4%). In group clearcutting – disturbances turned out to be the smallest in CTL with a chain saw or harvester and a forwarder (index 0.7 and 1.9%) and the biggest in long wood method with a chain saw and a skidder (index – 2.7).

Słowa kluczowe

• soil disturbances
• pine stands
• wood harvesting