tailieunhanh - Báo cáo lâm nghiệp: "Nutrition of silver fir (Abies alba Mill) growing at the upper limit of its occurrence in the Šumava National Park and Protected Landscape Area"

JOURNATuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Nutrition of silver fir (Abies alba Mill) growing at the upper limit of its occurrence in the Šumava National Park and Protected Landscape Area. | JOURNAL OF FOREST SCIENCE 56 2010 9 381-388 Nutrition of silver fir Abies alba Mill growing at the upper limit of its occurrence in the Sumava National Park and Protected Landscape Area R. Novotny1 D. Cerny2 3 V. Sramek1 forestry and Game Management Research Institute Strnady Jiloviste Czech Republic 2Sumava National Park and Protected Landscape Area Department of Forest Ecology Vimperk Czech Republic Department of Silviculture Faculty of Forestry and Wood Sciences Czech University of Life Sciences in Prague Czech Republic ABSTRACT In the second half of 20th century silver fir regeneration has been observed throughout all of the Europe including the Czech Republic. The Bohemian Forest - Sumava Mts. is one of the regions where the silver fir percentage in forest stands is supposed to be increased from the present 2 to nearly 12 . During the period 2006-2007 in the Czech part of the Bohemian Forest samples of silver fir were taken mainly in the upper altitudinal limit of silver fir occurrence. In the present paper the results of performed analyses are compared with similar surveys conducted in the other European regions. Samples from the Bohemian Forest in contrast to other results differ in higher phosphorus content and lower contents of calcium and manganese. Nitrogen content is slightly higher. Our values for the other elements magnesium potassium zinc sulphur are comparable to those reported in Poland and Slovakia. In Germany aside from the above mentioned differences higher magnesium content was also found within the locality sampled. Keywords Abies alba silver fir nutrition Sumava National Park and Protected Landscape Area upper limit of occurrence Silver fir Abies alba Mill. was an important species for forestry in the last centuries. Due to the transition to clear-cut forest management giving priority to Norway spruce Picea abies L. Karst. the ecological demands of fir were not respected and its proportion in forest stands has decreased significantly Uhlírová