Báo cáo lâm nghiệp: "properties of Norway spruce timber Comparison between fast- and slow-grown stands and influence of radial position of sawn timber" pdf

... 1996. Original article Bending properties of Norway spruce timber. Comparison between fast- and slow-grown stands and influence of radial position of sawn timber I. Robert Kliger* Mikael ... studs from fast-grown stands alone. 2. MATERIALS AND METHODS 2.1. Specimen preparation 2.1.1. Fast-grown stands For a more detailed description...

Ngày tải lên: 09/08/2014, 04:20

... were identified and selected close to the temporary production plots, installed by the Department of Silviculture of the CIFOR-INIA between 1992 and 2000, in even- aged stands of Pinus pinea in ... black spruce stands: tests of hypotheses, For. Sci. 45 (1999) 484–491. [4] Beland M., Bergeron Y., Height growth of jack pine (Pinus banksiana) in relation to site types in bor...

Ngày tải lên: 08/08/2014, 01:21

... two-species stands into one-species stands. Our objective was to analyze the species composition of progeny plantations established from seeds gained from oak selected seed stands of mixed composition. ... selected seed stands located in Legnica (51 ◦ 12’ N, 16 ◦ 10’ E) and in Jamy (53 ◦ 34’ N, 18 ◦ 55’ E). Species composition of both stands is given in Table I. Although the...

Ngày tải lên: 07/08/2014, 16:21

... part of EC. Plant-soil interactions were observed on an example of natural spruce stand (NSS), semi-natural spruce stand (SNSS) and allochthonous spruce stand (ASS) in conditions of the spruce ... fluctuations of soil moisture and many pests. Localities character- istic of central uplands of the Hrubý Jeseník Mts., where natural spruce stand, spruce stand influenc...

Ngày tải lên: 07/08/2014, 03:22

... variation for clearwood MOE and MOR in progenies from a natural stand of Norway spruce. The relationships between density and MOE and MOR are well known [20]. Since the dependency of density on the me- chanical ... j, αγ ij is the random interaction between family i and block j and ε ijn is the random residual. The random terms are assumed to Table II. Total means, p-val...

Ngày tải lên: 07/08/2014, 16:21

... e assessment of the bark beetle occurrence was based on the mean volume of infested (standing and lying) trees removed an- nually from 1 ha of stands. e classification of the stands according ... conditions. MATERIAL AND METHODS e assessment of the intensity and dynamics of the dying of stands was carried out on the basis of the data collected in the SILP Syste...

Ngày tải lên: 07/08/2014, 03:22

... trials and Supported by the Czech University of Life Sciences in Prague, Faculty of Forestry and Environment, Project No. 41130/1312/413162. Initial evaluation of half-sib progenies of Norway spruce ... method is restricted to the random component of the model. REML procedure consists of a search through the entire range of parameter space and the computation of...

Ngày tải lên: 07/08/2014, 03:22

... leaching of basic cations of Ca and Mg from soil. is study aims to compare impact of 20 year last- ing cover of blue spruce, and clear-cut reed Calama- grostis villosa on the former Norway spruce ... P et Supported by the Ministry of Agriculture of the Czech Republic, Research Project No. MZE 0002070203. Comparison of the impact of blue spruce and ree...

Ngày tải lên: 07/08/2014, 03:22

... found in experimental plots with stands non conversed (1, 3 and 7) and with stands during conversion (2, 4 and 8) Stands non conversed Average density (m 2 ) Stands during conversion Average density ... different than in spruce stands with close distance to mixed forests. Table 6. Number of Mesostigmata mites species found on the plots with stands non conversed (1, 3 an...

Ngày tải lên: 07/08/2014, 03:22

... of solar radiation on the soil in the existing Norway spruce groups of stands. CONCLUSION e Norway spruce decline and dieback in lower forest altitudinal vegetation zones has become one of ... causes of the decline of spruce stands in five selected regions of the Czech Republic – from FAVZ 2 to FAVZ 5 in nutrient-rich and acidic sites. With respect to the size...

Ngày tải lên: 07/08/2014, 03:22