TAILIEUCHUNG - Báo cáo lâm nghiệp: "Department of Forest Establishment and Silviculture, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Department of Forest Establishment and Silviculture, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic. | JOURNAL OF FOREST SCIENCE 56 2010 8 361-372 Decline of Norway spruce in the Krkonose Mts. O. Mauer E. Palátová Department of Forest Establishment and Silviculture Faculty of Forestry and Wood Technology Mendel University in Brno Brno Czech Republic ABSTRACT The paper summarizes results from the analyses of Norway spruce Picea abies L. Karst. stands managed by the Forest Administration in Horní Marsov Krkonose National Park KRNAP which are affected by decline and by yellowing of the assimilatory apparatus. Forest stands included in the analyses were aged 10-80 years and originated from both artificial and natural regeneration. Analyses of root systems were combined with analyses of soil chemical properties and assimilatory organs weather conditions and emissions. The analyses showed that affected trees had small and malformed anchoring root systems with a lower number of horizontal roots and a lower number of fine roots of lower vitality high proportion of dead fine roots which penetrated only through the uppermost humus horizons. Root systems of affected trees are infested by the honey fungus Armillaria sp. which colonizes anchor roots. Neither root nor bole rots were detected so far. Keywords decline fine roots honey fungus malformation Norway spruce root system Forest ecosystems in the borderland mountains of the Czech Republic were affected by large-scale decline and decay in the last decades of the 20th century. Vacek and Podrazsky 2007 assumed that forests in the western and eastern part of the Krkonose Mts. were affected by air pollution and ecological stress from about 1972 and 1959 respectively. According to the authors the first conspicuous injury to spruce forests in the Krkonose Mts. was observed after a climatic extreme in March 1977 at the beginning of 1979 and also in connection with the larch bud moth Zeiraphera diniana Gn. outbreak in 1977-1981. The damage to forests was increasing since then and resulted nearly in a total destruction of forest .

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