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

... 82–88 in Růžová hora the average decrease was 0.70 g, in Sněžka 0.81 g (Fig. 5). Changes in the parameters within the years 2004–2006 Data on mycorrhizal status of roots obtained from spring ... approximately in the same distance (about 1 m) from the stem of five selected trees. e cylinder of the soil probe used for this purpose had the inner diameter of...

Ngày tải lên: 07/08/2014, 03:22

... 526/03/H036. Multivariate statistical approach to comparison of the nutrient status of Norway spruce (Picea abies [L.] Karst.) and top-soil properties in differently managed forest stands P. S 1 , ... 1992). Norway spruce (Picea abies [L.] Karst.) is the main edificator and stand-forming tree species in mountain spruces sta...

Ngày tải lên: 07/08/2014, 03:22

... remarkable increase in wood density along the stem radius in all the models. In the CW zone, the increase is more distinct in the first 40 years of growth, then the wood density stagnates. In the other ... trend when density increases with the increasing percentage of compression wood in the sample. When there is 10% of compression wood i...

Ngày tải lên: 07/08/2014, 03:22

... 2/0045/08, and by the Slovak Research and Development Agency, Contract No. APVV-0102-06. Changes in air quality in different phases of forest management process in a sub-mountain beech ecosystem (West ... ecosystem (West Carpathian Mts.) D. K Institute of Forest Ecology, Slovak Academy of Sciences, Zvolen, Slovakia ABSTRACT: We studied ai...

Ngày tải lên: 07/08/2014, 03:22

... possibilities of using Norway spruce (Picea abies [L.] Karst.) in forest regeneration in the air-polluted region of the northeastern Krušné hory Mts. P. K, O. M Faculty of Forestry and ... parts of the stands) than in the Krušné hory Mts. (with underplanting realized inside the stands) was also a reason for the relative...

Ngày tải lên: 07/08/2014, 03:22

... Variability of spruce (Picea abies [L.] Karst.) compression strength with present reaction wood V. G, H. V Faculty of Forestry and Wood Technology, Mendel University of Agriculture ... the compression strength of fresh spruce is (44%) higher than that of normal wood. e objectives of this paper are to find out the lim- its of compression...

Ngày tải lên: 07/08/2014, 04:20

... Norway spruce (Picea abies [L.] Karst.) with focus on bark beetles (Coleoptera: Scolytidae) and types of tree damage in diff erent gradation conditions E. K 1 , W. Z 2 1 Faculty of Forestry ... merocoenosis of cambioxylophagous insect fauna associated with stems of standing spruce trees attacked by bark beetles, in th...

Ngày tải lên: 07/08/2014, 10:21

... in the research area, mean values of the estimate of the red deer population density were deter- mined in the Jelení hora hunting district in 2007 and 2008 using the FSC method, viz 24 ± 23 individuals·km –2 ... (2): 59–63 59 JOURNAL OF FOREST SCIENCE, 57, 2011 (2): 59–63 Red deer density in the air-polluted area of forest ecosystems in the...

Ngày tải lên: 07/08/2014, 10:21

... rotation to integrate timber and pine nut production with the conservation of structural diversity in a Pinus pinea (L.) forest Fernando M a * ,MaríaJ.H  ´  b , Rafael C a ,IsabelC ˜  a a CIFOR-INIA, ... lag cen- tred at d ,andz(u a )andz(u a +d) are the values that the variable z takes at samplesu a and u a...

Ngày tải lên: 07/08/2014, 16:20

... edge of P-1). The regeneration of the stands is always natural (shoot + seedling); no planting was identified in the woodlots studied. Clearing, thinning of seedlings, early thinning and pruning were ... particu- larly concerning the density of the maintained standards, but were often in the framework of a cordial relationship. Cutting regimes in small forest 927 [20]...

Ngày tải lên: 07/08/2014, 16:20

... 10.1051/forest:2007029 Original article Variability in Populus leaf anatomy and morphology in relation to canopy position, biomass production, and varietal taxon Najwa AL A a ,NicolasM a,b , Reinhart C a * a University ... determines leaf display, leaf distribu- tion and canopy density, and therefore in uences light inter- ception [27]....

Ngày tải lên: 07/08/2014, 16:21

... Oxford. Article original Nodulation in vitro et étapes précoces de l’infection rhizobienne chez Acacia albida (Del) (syn Faidherbia albida) YK Gassama/Dia Département de biologie végétale, ... l’étude des stades précoces de l’infection rhizobienne, des prélèvements de racines infectées ont été effectués 10 puis 15 j après l’inoculat...

Ngày tải lên: 08/08/2014, 18:21

... Original article The growth of spruce (Picea abies (L) Karst) in the Krkonoše-(Giant) Mountains as indicated by ring width and wood density C Sander D Eckstein J ... reveal any grouping of the sites, slope chronologies for tree -ring width and latewood density were built. In table I, the statistics of both th...

Ngày tải lên: 08/08/2014, 19:21

... to semi-arid regions [37]. Mature trees of Faidherbia albida are famous for their [19] Ismail A. M., Hall A. E., Inheritance of car- bon isotope discrimination and water-use ... A. , Loustau D. and Ferhi A. , Genetic and environmental determinants of water-use efficiency and car- bon isotope discrimination in forest trees, in: Sa...

Ngày tải lên: 09/08/2014, 04:20

... of the day. Variation in vapor deficit and irradiance explained only 33% of the variation of gs. No stratification could be shown in the crown at any time of the day. Soil ... In the pre-drought period, the stomatal response to air water vapor deficit and irradiance explains 52% of the total gs variation; gs decreases as D in...

Ngày tải lên: 09/08/2014, 04:20