Báo cáo lâm nghiệp: "Succession of or stand age" pptx

... Succession of mycorrhizae: a matter of tree age or stand age? D. Blasius F. Oberwinkler Institut für Botanik, Spezielle BotaniklMykologie, Universität TObing 6 ,n Auf der Morgenstelle ... a considerable amount of pub- lished evidence to support the view that a succession of mycorrhizae occurs during the development of first-rotation forest plant...

Ngày tải lên: 09/08/2014, 04:20

... Distribution of pH H 2 O in layers of forest floor and organomineral horizon in different experimental stands Fig. 3. Distribution of pH KCl in layers of forest floor and organomineral horizon in ... content of DOC was noted in forest floor and then in Ah horizon. It has been proved that forest floor horizons (L, F, H) contain the highest pro- portion of organic substances and...

Ngày tải lên: 07/08/2014, 03:22

... 2007). Supported by the Ministry of Education, Youth and Sports of the Czech Republic, Project No. MSM 6215648902. Results of a phenological study of the tree layer of a mixed stand in the region of ... environmental signal for the tree to use for the optimal timing of the onset of growth. For deter- mining the onset of developmental stages, the concept of temperature s...

Ngày tải lên: 07/08/2014, 03:22

... (mean and standard deviation) of stand volume (open triangles) and volume of mean stem (grey circles) of spruce stands in Machov experiment at the age of 41 years (2007). Comparison for three ... stands is an important silvicultural measure directed at development of forest stands in terms of their production and non-production func- tions. Segmentation of stands by tracks...

Ngày tải lên: 07/08/2014, 03:22

... authors also reported that growing roots play an important role in the process of for- mation of preferential flowpaths for water (S 1980; K et al. 2003; N 2005). e former ... initial size of the calibration period. Keywords: drainage treatment; forested watershed; recession limb; runoff components; stormflow hydrograph Supported by the Ministry of Agriculture of...

Ngày tải lên: 07/08/2014, 03:22

... 2 arithmetic mean, 3 standard deviation, 4 average change of yield class, 5 arithmetic mean of errors, 6 standard deviation of errors, 7 root mean square error, 8 value of the t–test, *Values ... numerical evaluation of relative errors of yield tables according to formulas (2)–(5) is given in Table 1. Development of mean height Development of mean heights of beec...

Ngày tải lên: 07/08/2014, 03:22

... Specifically, SWD of forest trees is influenced by many factors. ere are physi- cal factors influencing SWD – weight of the crown, ice or snow loading. From the abiotic factors – soil moisture ... Intention of ISBE AS CR, Project No. AV0Z60870520. Influence of stand density, thinning and elevated CO 2 on stem wood density of spruce I. T 1 , R. P 1 , M. V. M 1...

Ngày tải lên: 07/08/2014, 03:22

... Supported by the Ministry of Education, Youth and Sports of the Czech Republic, the Research Plan of the Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry ... flows out of the forest. In scientific literature attention is paid to the problem of the water regime of forest stands in win- ter seasons including snow measurements already for...

Ngày tải lên: 07/08/2014, 04:20

... proportional to absorbed PAR. e spatial structure of forest stand canopy plays a key role in the absorbing process of incident radia- tion. Because of the role of active leaf area in PAR absorption ... on the basis of stand inventory realized at the end of each growing season. e procedure of the stand inventory consisted of measurements of stem circumference at t...

Ngày tải lên: 07/08/2014, 10:21

... of forest floor 0 10 20 30 40 50 60 70 80 Spruce forest stand Beech forest stand Mixed forest stand (t/ha) layer L layer F layer H suma Mixed Beech Spruce forest forest forest stand stand stand 122 ... of pH KCl in layers of forest floor and orga- nomineral horizon in different forest stands Fig. 3. Distribution of pH H 2 O in layers of forest floor and orga- nomineral ho...

Ngày tải lên: 07/08/2014, 10:21