tailieunhanh - Báo cáo lâm nghiệp: " Production potential of Douglas fir at mesotrophic sites of Křtiny Training Forest Enterprise"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Production potential of Douglas fir at mesotrophic sites of Křtiny Training Forest Enterprise. | JOURNAL OF FOREST SCIENCE 54 2008 7 321-332 Production potential of Douglas fir at mesotrophic sites of Krtiny Training Forest Enterprise P. Kantor Faculty of Forestry and Wood Technology Mendel University of Agriculture and Forestry in Brno Brno Czech Republic ABSTRACT The study evaluates production parameters height diameter at breast height volume of Douglas fir Pseudotsuga menziesii Mirb. Franco at mesotrophic sites of the Krtiny Training Forest Enterprise in mature stands. In total 29 mixed stands were assessed with the registered proportion of Douglas fir at an age of 85 to 136 years. Comparing the 10 largest Douglas firs with the 10 largest spruces or larches higher and as a rule markedly higher production potential of introduced Douglas fir was found in all assessed stands. There were also groups of trees where the volume of Douglas fir was twice to 3 times higher than the volume of spruce or larch see Tabs. 5 to 10 . For example in stand 177B11 the mean volume of m3 was recorded in the 10 largest Douglas fir trees but the volume of spruce reached only m3 and the volume of larch was m3. Differences in mensurational parameters of Douglas fir found on the one hand and of Norway spruce Picea abies L. Karst. or European larch Larix decidua Mill. on the other hand compared by ANOVA tests were statistically highly significant. Annual ring analyses have shown that at present the volume increment of particular Douglas fir trees ranges from to m3 per year in mature stands . about m3 every 10 years . Keywords Douglas fir Norway spruce European larch production potential mesotrophic sites In 2005 within research programs of Ministry of Agriculture of the Czech Republic the competition of tenders was announced among others in the thematic field Using allochthonous species in multifunctional and sustainable forest management. The author of the paper presented in the competition the draft of a project entitled Douglas fir - the most .

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