tailieunhanh - Báo cáo lâm nghiệp: "Stability of Norway spruce (Picea abies [L.] Karst.) stands in the Beskid Śląski and Beskid Żywiecki Mts. from the aspect of their nutrition status"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Stability of Norway spruce (Picea abies [L.] Karst.) stands in the Beskid Śląski and Beskid Żywiecki Mts. from the aspect of their nutrition status. | JOURNAL OF FOREST SCIENCE 54 2008 2 41-48 Stability of Norway spruce Picea abies L. Karst. stands in the Beskid ắlạski and Beskid Zywiecki Mts. from the aspect of their nutrition status J. Barszcz S. Malek Department of Forest Ecology Agricultural University of Cracow Cracow Poland ABSTRACT The aim of the present research was to determine the stability of spruce stands in the areas of threat to forest stability in the Beskid Slạski and Beskid Zywiecki Mts. in the light of their nutrition. In 2002 samples of soil and of one- and two-year-old spruce needles were taken from sample plots representing various degrees of the threat of disintegration to stands. The following factors were determined in soil reaction exchangeable acidity content of exchangeable cations Ca2 Mg2 K and Na and the total content of macroelements C N S Ca Mg K and Na. Very small amounts of alkaline cations were found in the sorptive complex present also in the chemical composition of spruce needles where most of the elements under analysis were in the lower zone of the optimum range or below the threshold values. The results of chemical analyses of spruce needles indicate differences in their content in various needle ages and a disturbance of their proportions particularly of N S K to Ca and Mg in the stands under serious threat of disintegration. They document the upsetting of mineral economy in spruce which in turn may influence a greater susceptibility of this species to stress factors. Keywords Norway spruce soil needles macroelements stability Beskid Slạski Mts. Beskid Zywiecki Mts. Southern Poland The forests of the Beskids Mts. belonging to the Regional Directorate of State Forests in Katowice RDLP Katowice are characterized by a high proportion of spruce particularly in their western and southern parts which is mainly found in monocultures is often of unknown origin and grows at unsuitable sites. In the Beskid Zywiecki Mts. this species takes up from about 75 to about 95 on average 85 of