Báo cáo lâm nghiệp: "Macronutrients in tree stems and foliage: a comparative study of six temperate forest species planted at the same sites" pps

... saturation was calculated as the ratio between the sum of extractable amount of base cations and the total cation exchange capacity of a soil sample.Macronutrients in temperate forest trees 493Figure ... articleMacronutrients in tree stems and foliage: a comparative study of six temperate forest species planted at the same sitesAnna HAGEN-THORN a *, K stutis ARMOLAITISb, Ingeborg CALLESENc, Ingrid STJERNQUIST a a ... for each plot. Leaves and needles were sampled in the second half of August 2000 in Sweden and Lithuania and at the beginning of September 2000 in Denmark at the DK-2 site. At the otherDanish...

Báo cáo lâm nghiệp: "Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff (Caesalpiniaceae)" ppsx

... unit leaf area (N a ), and light-saturated rate of photosynthesis perunit leaf area (A maxa) and dry mass (A maxm) were calculated. A piece of lamina of each leaf (1 cm2, three replicates ... displayed the largest range of variation at medium light (Fig. 5). The ASD effect was to increase N a and Nm in the understorey and clearing. N a and Nm were maximal at ASD 4 and decreased at ... 2). In general, the range of variation was larger for ASDs in the clearing than in the understorey, particularly for LMA and stomatal density.LMA was lower at low than at medium irradiance; the...

Báo cáo lâm nghiệp: "Changes in phenolic acids and stilbenes induced in embryogenic cell cultures of Norway spruce by two fractions of Sirococcus strobilinus mycelia" pot

... se-rum albumin as a standard. e results indicated that the mycelial cell walls contained 19.40 mg of ionically bound protein per gram of the cell wall preparation (fresh weight) and 77.6 ... 600, SmithKlineBeechcham Pharmaceuticals, Worthing, UK). e resulting ho-mogenate was centrifuged at 14,000 g for 20 min at 4°C to obtain a supernatant containing intracellu-lar proteins – 12.20 ... ﬂasks containing 50 ml of 12 g·l–1 Difco Maltose Extract and incubated at 24°C in an orbital incuba-tor (IOC.400.XX2.C SANYO-Gallenkamp, Leices-ter, UK) at 120 rpm. Approximately 5 g of...

Báo cáo lâm nghiệp: "Variation in wood properties among ﬁve full-sib families of Norway spruce (Picea abies)" ppt

... the boards wasmeasured by a protractor in degrees. The mean of the pith- and barkfacing readings was used in the analysis.Data analysis The analyses of growth traits are here based on measurements ... TapioJärvinen, Tapio Nevalainen and Kari Sauvala for sample prepara-tion and determing MOE and MOR; Irmeli Luovula for analysing the FTIR samples; Åke Hansson and Örjan Hedenberg for preparing and analysing ... to an arm along the pith- and bark facing side of the boards. The needle followed the grain and left a track in the wood. The angle of this track relative to the longitudinal direction of the...

Báo cáo lâm nghiệp: "Nutrients in the aboveground biomass of substitute tree species stand with respect to thinning – blue spruce (Picea pungens Engelm.)" doc

... evaluate the eﬀect of biomass removal, we calculated data (diameter structure – Fig. 2) from real thinning which was done at the age of 16 years in the observed stand. All statistical analyses ... stand without thin-ning amounted to approximately 56 thousand kg of dry matter per ha at the age of 22 years. Wood and bark of branches are the most important parts of the aboveground biomass ... of basal area) was done at the age of 16 years. is thinning resulted in a loss of ca 8.7 thousand kg/ha of total biomass, which contained 53 kg of N, 5 kg of P, 22 kg of K, 26 kg of Ca and...

Báo cáo lâm nghiệp: "Linking intra-tree-ring wood density variations and tracheid anatomical characteristics in Douglas ﬁr (Pseudotsuga menziesii (Mirb.) Franco)" pot

... understand density vari-ations along a ring, it is necessary to explain packing den-sity variations and in particular reasons why wood densitydecreases at the beginning of a ring. To do that, anatomical ... this study that cell-wall surface and alsocell-wall thickness slightly decrease at the beginning and at the end of a tree- ring. Cell-wall thickness reduction at the end of a tree- ring is already ... set of simulations, all the variables of the model altered, with exception of the variable of interest, whichwas ﬁxed to its initial value at the beginning of a ring (Fig. 3B).When radial and...

Báo cáo lâm nghiệp: "Changes in the mycorrhizal status of some mountain spruce forests" potx

... (from April to September). In the matrix of these variables the basic statistical values were calculated and the correlations were evaluated. Except for the correlations mentioned in Discussion ... Discussion any other relationships cannot be proved. One of the reason is that the investigation period 2004–2006 is rather short and the in uence of weather oscillation from year to year cannot ... roots and mycorrhizae were sampled and evaluated according to the same standard method (P, S 2006).Assessment of defoliation In the study plots, the health condition of trees was assessed...

Báo cáo lâm nghiệp: "Variability in density of spruce (Picea abies [L.] Karst.) wood with the presence of reaction wood" potx

... height of the tree crown, position of the tree in the stand) operate simultaneously, in uenc-ing the character and the organization of individual anatomical elements, including varying wood ... models is again a confirmation of the statistical results of ANOVA. e created functions and equa-tion coefficients valid for the description of the wood density variability in relation to the position ... Further, the statistical research shows that the in uence of the position in the stem, i.e. the radius and the height, on wood density is statistically significant (the statistical research...

Báo cáo lâm nghiệp: "Changes in Austrian pine forest floor properties in relation with altitude in mountainous areas" pdf

... main tree species is black pine and which is mana-ged under the administration of the Kaz Mountain National Park Directorate. At the study site totally 74 forest ﬂoor layer samples as leaf ... Rates of nitrogen miner-alization across an elevation and vegetation gradient in the southern Appalachians. Plant and Soil, 204: 235–241.KÖRNER C., 1998. A re-assessment of high elevation treeline ... concentration and material with higher C:N ratios had a longer duration of immobilization and in turn a slower release phase. is result helps to explain the relation between tree nutrition and...

Báo cáo lâm nghiệp: "Changes in air quality in different phases of forest management process in a sub-mountain beech ecosystem (West Carpathian Mts.)" pdf

... was evident on all plots – indicating the absence of connection with the individual phases of forest management process, but at the same time indicating the presence of climate change. In the ... case of small areal units, passive sampling is a method well-fitted for evaluating the data in terms of potential damage to forest stands by pol-lutants, and for definition of the risk area ... significant, and they indicate that the stocking density does not play an important role in association with ozone a ecting the stands. e increase in ozone concentrations after the second intervention...

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