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 493 Figure ... article Macronutrients in tree stems and foliage: a comparative study of six temperate forest species planted at the same sites Anna...

Ngày tải lên: 08/08/2014, 01:22

... unit leaf area (N a ), and light-saturated rate of photosynthesis per unit leaf area (A maxa ) and dry mass (A maxm ) were calculated. A piece of lamina of each leaf (1 cm 2 , three replicates ... displayed the largest range of variation at medium light (Fig. 5). The ASD effect was to increase N a and N m in the understorey and clearing. N a and N m w...

Ngày tải lên: 08/08/2014, 00:22

... 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...

Ngày tải lên: 07/08/2014, 10:21

... the boards was measured by a protractor in degrees. The mean of the pith- and bark facing readings was used in the analysis. Data analysis The analyses of growth traits are here based on measurements ... Tapio Järvinen, Tapio Nevalainen and Kari Sauvala for sample prepara- tion and determing MOE and MOR; Irmeli Luovula for analysing the FTIR samples; Åke Hansson...

Ngày tải lên: 07/08/2014, 16:21

... 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...

Ngày tải lên: 07/08/2014, 10:21

... understand density vari- ations along a ring, it is necessary to explain packing den- sity variations and in particular reasons why wood density decreases at the beginning of a ring. To do that, anatomical ... this study that cell-wall surface and also cell-wall thickness slightly decrease at the beginning and at the end of a tree- ring. Cell-wall thickness re...

Ngày tải lên: 07/08/2014, 16:20

... (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 oscill...

Ngày tải lên: 07/08/2014, 03:22

... 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 dens...

Ngày tải lên: 07/08/2014, 03:22

... 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-asse...

Ngày tải lên: 07/08/2014, 03:22

... 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...

Ngày tải lên: 07/08/2014, 03:22