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PL
W pracy określono trend przyrostu grubości drzew i jego zmiany w drzewostanach sosnowych IV/V klasy wieku rozwijających się pod wpływem imisji przemysłowych i na jego podstawie oszacowano straty na przyroście grubości w drzewostanach I, II i III strefy zagrożenia w stosunku do drzewostanów kontrolnych (strefa 0).
EN
The purpose of this study was to determine a trend of the tree diameter increment, its changes, and losses in the diameter increment in stands developing within a reach of industrial immissions. Investigations were carried out in 90-year-old Scotch pine stands situated in different danger zones of three industrial regions: (the Tarnobrzeg Sulphur Basin (TZS). the Legnica-Głogów Copper District (LGOM), and zinc and lead smelting works in Miasteczko Śląskie (MSL). A method of converion of absolute increment values into coefficients I (formula 2) was utilized. The actual increment for individual calendar years is shown in Fig. 1, and after conversion into coefficients in Fig. 2. Changes in trend were determined using coefficient Is calculated by formula 3, and increment losses using coefficients I1 and I2 calculated by formulae 4 and 5 (Table 1, Figs. 2, 3). It was concluded that after 1967 in stands situated within a reach оf industrial immissions the changes look place in tree diameter increment trend. These changes have a similar character in all industrial regions, and their negative direction increases with increase of industrial hazard from zone 0 to zone III. The estimated losses in the tree diameter increment during the last 25 years (1968-1992) were 21.1% to 26.7% and in some shorter periods reached as much as 36.7%.
PL
W pracy przedstawiono kształtowanie się przyrostu grubości drzew w 40, 60 i 90-letnich drzewostanach sosnowych, rozwijających się w różnych strefach zagrożenia trzech regionów przemysłowych: Tarnobrzeskiego Zagłębia Siarkowego, Legnicko-Głogowskiego Okręgu Miedziowego oraz hutу cynku i ołowiu w Miasteczku Śliskim. Określono również krzywe modelowe przyrostu grubości drzew w zależności od klasy wieku drzewostanu i strefy zagrożenia.
EN
The purpose of this study was to characterize the current annual increment of d.b.h. radius of trees in 40, 60 and 90-year-old Scotch pine stands situated in different danger zones of three industrial regions: the Tarnobrzeg Sulphur Basin (TZS), the Legnica-Głogów Copper District (LGOM), and zinc and lead smelting works in Miasteczko Śląskie (MŚL). The study material in from of icrement borer cores taken from every fourth tree was collected in 62 expe­rimental sites (Table 1). Mean increment of d.b.h. radius was calculated for each urea for two 25-year increment periods. First (x1) comprised the period 1968-1992, i.e. the period when stands were developing under the effect of industrial immisions, and second (x2) for the period 1943-1967, i.e. before the occurrence of harmfull factor (Table 2). The dynamics of diameter increment drop was determined using drop coefficient (W) according to formula 3 (Table 2). The course of current diameter increment (Figs. 1-3) was balanced using six different formulae (I-IV). One formula was selected (formula II) and used to determine a model course of diameter increment (Table 3, Figs. 4, 5). The results obtained permitted to draw the following conclusions: 1. Current annual increment of d.b.h, radius during the last 25 years (x1) depended on age of a stand and amounted to 1.11 -1.52 mm in 40-year-old stands. 0.99- 1.15 mm in stands 60-years-old, and 0.78-0.81 in stands 90 years of age. 2. Magnitude of increment and its drop depended on stand age and danger zone, i.e. the increment decreases, and the drop increases as the threat to forest stand increases. 3. Course of the current annual increment of d.b.h, radius after its culmination is represented by function with formula у = a + b/w (formula II), and the model curves drafted on its basis may serve in evaluation of increment course in individual industrial danger zones.
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