tailieunhanh - Báo cáo lâm nghiệp: "Analysis of herbicide effects on Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Analysis of herbicide effects on Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration. | JOURNAL OF FOREST SCIENCE 56 2010 5 209-217 Analysis of herbicide effects on Douglas fir Pseudotsuga menziesii Mirb. Franco natural regeneration V. Hart1 M. Nentvichová-Hartová2 P. Tauchman1 -Department of Silviculture Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague Czech Republic Department of Ecology Faculty of Environmental Sciences Czech University of Life Sciences Prague Prague Czech Republic ABSTRACT Douglas fir Pseudotsuga menziesii Mirb. Franco natural regeneration under parent stand after weed suppression was investigated in the area of the Training Forest Enterprise in Kostelec nad Cernými lesy. The study evaluates two measurements made in a two-year interval. The parent stand where Douglas fir grows in mixture with our domestic tree species is one of the oldest and most productive stands at the Training Forest Enterprise in Kostelec nad Cernými lesy. Herbicides for the control of weeds were applied onto three permanent experimental plots under the parent stand. Measurements done on the plots show a high potential of natural regeneration in areas where the negative impact of forest weeds was suppressed. This conclusion is acknowledged by the high seedling number found on research plots treated with herbicides. The number of Douglas fir seedlings varied from 21 600 per hectare counted on the plot treated with Dominator to 26 650 seedlings on the plot with Velpar treatment even six years after the soil preparation. Statistical analysis confirmed that the seedling number on the plot without any chemical preparation was significantly lower only 950 individuals per hectare x2 df 3 P . Keywords Douglas fir herbicides introduced tree species natural regeneration Importance and possibilities of tree species introduction Introduced tree species could take an important place in sustainable multifunction forest management in the Czech Republic similarly like in other European countries. The introduction has a long .

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