Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Spatial distribution of four spruce bark beetles in north-western Slovakia. | JOURNAL OF FOREST SCIENCE 53 2007 Special Issue 45-52 Spatial distribution of four spruce bark beetles in north-western Slovakia M. Turcáni1 T. Hlásny2 1Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague Czech Republic Department of Ecology and Biodiversity of Forest Ecosystems National Forest Centre - Forest Research Institute Zvolen Slovakia ABSTRACT Infestation density of four the most common spruce bark beetle species was estimated on 15 study sites 10 trees per site in the Kysuce model region in 2006. Five half-metre long sections of the stem were selected and dissected at the base of the stem midway between the base of the stem and the base of the crown just below the base of the crown in the middle of the crown and in the upper part of the crown. The infestation density of bark beetles expressed as the number of mating chambers per dm2 was determined. Ordinary kriging was then used to produce smooth maps and visualize spatial distribution of study species. Maps with isolines indicating high infestation were produced for study species I. typographus over I. amitinus over I. duplicatus over and P chalcographus over nuptial chambers per dm2 . Ips typographus L. remained dominant species on majority of sites having high intensity of infestation. Lower altitudes in the south-eastern part of the region were often infested by I. duplicatus Sahlberg and also by I. typographus and Pityogenes chalcographus L. Higher elevations in the north-eastern part of territory in the vicinity of border with Poland were heavily infested by I. amitinus Eichhoff often with I. typographus . P. chalcographus was abundant on majority of territory - mainly in southern half of area. However locally it was found in extremely high abundance. The results suggest the need for control measures set up jointly against the most abundant bark beetle species in study region. Keywords bark beetles infested spruces spatial distribution kriging
