Báo cáo lâm nghiệp: "Initial evaluation of half-sib progenies of Norway spruce using the best line" potx

... selection of the best plus trees based on the performance of their half- sib progenies (R 1 ); response to selection of the best half-sib progenies (R 2 ); response to selection of the best clonally ... by the Czech University of Life Sciences in Prague, Faculty of Forestry and Environment, Project No. 41130/1312/413162. Initial evaluation of half-si...

Ngày tải lên: 07/08/2014, 03:22

... e studies of the possibility of improving the somatic embryogenesis in a less responsive hurst ecotype of Norway spruce by exogenous addition of polyamines will be the subject of our next ... DISCUSSION e contents of free PAs (putrescine, spermidine and spermine) at different developmental stages of Norway spruce embryos were determined by the means of HP...

Ngày tải lên: 07/08/2014, 10:21

... most spruce trees showed defoliation prevail- ingly in the range of 25–35%, beeches had the good status of the crown with defoliation mostly in the range of 15–25% (evaluated according to the ... results allow the comparison of production or mortality between these particular time periods. For instance, if we take the production rate of spruce fine roots in th...

Ngày tải lên: 07/08/2014, 10:22

... almost all shoot samples the content of isopentenyladenosine is higher than the content of the zeatin riboside. Comparing the content of cytokinin ribosides in the roots of the seedlings no significant ... imbalance. The aim of the NAA treatment was to investigate, whether an artificial increase of auxin on the root level can induce changes of the cytokinin c...

Ngày tải lên: 08/08/2014, 00:22

... 1 tree of each provenance per row, at 3 × 2 m spacing. No treatment had been undertaken until the date of sampling. 2.2. Desciption of the site The experimental site of Nefza is one of the several ... absence of local effects on the spe- cific adaptability of provenances. The evolutionary history of a region determines the distribution of the genetic variabilit...

Ngày tải lên: 07/08/2014, 16:21

... evaluate the close- ness of the nutrient status of the spruce stands and to assess the closeness of chemical properties of the studied sites. e results were tested by PCA. To test the homogeneity ... connection of roots with the soil as well as with the other tissues of the plant is related to soil water-holding capacity and to the potential of ion exc...

Ngày tải lên: 07/08/2014, 03:22

... Europe, it is known as the “Adamov population of larch” (accord- ing to one of the municipalities of the region). Supported by the Ministry of Education, Youth and Sports of the Czech Republic, ... meas- urements. Within the analysis of the hypothesis of the dependence of dieback of subdominant trees standard parameters of differences between upper and lo...

Ngày tải lên: 07/08/2014, 03:22

... in the unmixed beech stand (22.0 t/ha). e mixed stand of spruce with beech and the spruce stand repre- sent a mean between the stands. – e active soil reactions of forest floor of the spruce ... can conclude that the reserve of the mixed stand of spruce with beech approaches more the unmixed spruce stand than the unmixed beech stand. We can state that...

Ngày tải lên: 07/08/2014, 03:22

... soil acidification after the decline of atmospheric depo- sition, which can result in the growth depression of trees. Growth depression of Norway spruce was detected in the Bavarian Forest (W, ... century and at the beginning of the 20 th century might be a reaction to the closure of pasturing and timber harvesting (V 1994) in conjunction with the lo...

Ngày tải lên: 07/08/2014, 03:22

... dead wood was collected in the field during the inventory of the forests of the nature reserve Babia hora. The data were used for the calculation of CWD timber volume. In the next step, CWD timber ... L 2008) and the position on the ground (contact with the ground, R et al. 2004). In spite of the recognition of the importance of CWD for carbon s...

Ngày tải lên: 07/08/2014, 10:21