TAILIEUCHUNG - Báo cáo lâm nghiệp: "Chemical thinning in blue spruce (Picea pungens Engelm.) stands and its effects on cambioxylophagous fauna"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Chemical thinning in blue spruce (Picea pungens Engelm.) stands and its effects on cambioxylophagous fauna. | JOURNAL OF FOREST SCIENCE 56 2010 5 225-235 Chemical thinning in blue spruce Picea pungens Engelm. stands and its effects on cambioxylophagous fauna M. Pop1 E. Kula1 P. Manas1 R. Kajfosz2 -Faculty of Forestry and Wood Technology Mendel University in Brno Brno Czech Republic Forest Management Institute Brandýs nad Labem Czech Republic ABSTRACT Chemical thinning was applied in blue spruce Picea pungens Engelm. stands by the application of Roundup Klasik and Garlon 4 EC. The thinning efficacy of Garlon 4 EC was negligible while that of Roundup Klasik reached nearly 100 when the full strength concentration was applied in quantities of 1 ml per 10 cm of stem girth using the method of drilling holes for the arboricide injection. Treated blue spruce trees died within 6 month after application. No difference was found in the response of silver and green varieties of blue spruce to the application of arboricides. Several species of cambioxylophages colonizing blue spruce were killed by Roundup. The economically insignificant Hylurgops palliatus Gyll was the most abundant negatively affected insect species found on the stem followed by significant pests such as Ips amitinus Eichh. and Pityogenes chalcographus L. . In these species partial mortality of larvae was probably caused by the lowered quality of phloem. A significant mortality of Cryphalus abietis Ratz. was noted on branches. Keywords arboricides chemical thinning Ips amitinus Krusné hory Mts. Picea pungens Scolytidae In the period of culminating air-pollution stress in the 1980s stands of tree species substitute to Norway spruce were established on the area of 30 000 ha in the Krusné hory Mts. Blue spruce Picea pungens Engelm. was a dominant species in these stands. Its proportion in forest stands of the eastern Krusné hory Mts. accounts for an area of 8 400 ha Balcar et al. 2008 . At present thinning and reconstructions of these stands are carried out on a large scale. Silvicultural procedures applied in these

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