The fluctuation of forest entomocomplex in a pines stand burned area litter

Study object. The research was made in two forest stands: one was affected by fire and another without fire damage. A sample plot was in a pine stand damaged by fire a year ago, which is is in Kaunas forest enterprise, in Kulautuva forest department. The stand is in square No. 169 and the plots numbers are 14 and 15. The damaged area takes 0,4 hectare. It is 100% pine stand with a site index Nbl. Study aim. To investigate the low fire influence on pine stand litter entomocomplex fluctuation: on their number and seasonal dynamic, on their distrubution by trophical groups, on species abundance and variety in a fire damaged stands. Methods. The research was made in 2004 since april till october. The Barberis ground trap was used in a research. The trap is made from a 150 ml volume and 6,5 cm diameter plastic cruet. The traps were digged into ground to the top of the trap. 1/3 of the trap was filled with a 10% formalin soak. In that case the insects were saved of decomposing and birds. The traps were placed in three zones: in burned area, chequerwise in the place between damaged and undamaged area, and in undamaged area. There were 6 satelites in each area holding 4 traps in each. All together it was 72 traps placed. The distance between the areas was 20 m and the distance between satelites – 10 m. The collected insects were dried and recognized in the labs of Lithuanian University of Agriculture and Forest Research Institute. Results. The total amount of collected insects in 6 records made was 8838. A variety of 129 species was met. The undamaged sample plot had 78, the slightly damaged area – 81, and the damaged area – 84. During the research the ammount of insects in the damaged area was smaller than in the area with no fire met. In all three sectors the dominating were Coleoptera with 54%, Araneidae took 30% , Isopoda – 5%. The bug band consisted of Carabidae – 59%, Curculionidae – 26%, Scarabaeidae – 5%, others – 10%.Žemės ūkio akademijaVytauto Didžiojo universiteta