Negyvos medienos kiekio ir formos kitimas skirtingo ūkinio režimo paprastosios pušies (pinus sylvestris l.) medynuose

Abstract

Stambi negyva mediena yra vienas kertinių miško ekosistemos elementų, svarbių tiek bioįvairovės apsaugai, tiek ir medžiagų apykaitos ciklams (Nordén et al., 2004; Aakala, 2010; Franklin et al., 1987). Apie Lietuvoje vyraujančiuose pušynuose esančius skirtingų formų negyvos medienos kiekius ir jų priklausomybę nuo taikomo ūkinio režimo žinoma labai mažai. Tyrimų metu vertintas skirtingos formos stambios negyvos medienos Rytų Lietuvos pušynuose kiekis ir jo formavimosi, kaupimosi ir irimo ypatybės. Lyginti skirtingo amžiaus rezervatiniai ir ūkiniai miškai

Coarse dead wood is well documented to be one of the key elements in the forest ecosystem (Nordén et al., 2004; Aakala, 2010; Franklin et al., 1987). Yet, the knowledge about its amount, distribution in different forms and dynamic are still very scarce, especially referencing to a different management regime. The aim of this study was to evaluate an amount and formation dynamic of coarse dead wood in scot pine forests located in the eastern part of Lithuania. The research was carried out in the Ažvinčiai strict nature reserve and managed forests near by, both in premature and mature stands. The coarse dead wood formation during a period of last 29 years in a nature reserve was 2,5 m3/ha, and in managed forests 4,5 m3/ha annually. In accordance with decomposition and wood loos during logging currently in managed and nature reserve forests respectively there are 19,2% (24,9 m3/ha) and 60,8% (48,5 m3/ha) of coarse dead wood which has formed in the study area since 1986