Báo cáo lâm nghiệp: "Red deer density in the air-polluted area of forest ecosystems in the Krušné hory" pdf

... 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

... the dominant strata and the site index within the for- est area can be seen in Figure 4. The classification of the forest area in function of the stand age and the site index is shown in Table ... that the risk of stem rot by Phelllinus pini in Pinus pinea is related to the age of the stand, the height and the basal area (R 2 = 0.6681), carrying...

Ngày tải lên: 07/08/2014, 16:20

... du grain / lignine 1. INTRODUCTION Genetic improvement and intensive silviculture of loblolly pine (Pinus taeda L.) have increased forest plantation produc- tivity significantly in the southern ... latewood within each ring, respectively. The thick horizontal bars in the middle of the boxes are the standard deviations. Table I. Comparisons of juvenile (ring 3) and transit...

Ngày tải lên: 07/08/2014, 16:20

... diameter of the shoots of the stool; — mean height of the shoots of the stool; — summation of the areas of incidence of the crowns of the shoots of the ... and the area of incidence of the crown were used, com- paring them with those of the other shoots of the population, distinguishing three clas...

Ngày tải lên: 08/08/2014, 18:21

... blunt cutting edge does not cut the material in the process of chip cutting. It is mainly in the plain passing the lowest point of the cutting edge but it is also in the plain lying a little ... against the leading edge of the tooth, – forces necessary for suppression of friction on the back and leading surfaces against the machined surface. Defining the...

Ngày tải lên: 07/08/2014, 03:22

... foliage (usually the end of May up to the end of June and the beginning of July); summer feeders (SF) – feed- ing on mature leaves at the beginning of July to the beginning of August; and autumn ... in the number of species and individuals in seasonal guilds: (a) comparison of species in 1993; (b) comparison of species in 1994; (c) comparison of individ...

Ngày tải lên: 07/08/2014, 10:22

... chosen within the natural area of diffusion of the species in Italy (northern part of the country). All the populations belong to mixed forests, in which common ash is never the dominant species, ... pathway of gene flow oc- curs within the areas located at the lower levels of the moun- tain chains, where the distribution of common ash and other forest tree...

Ngày tải lên: 07/08/2014, 16:20

... important feature in the industrial processing of poplar wood remains the occurrence of tension wood fibres and their distribution within the stem volume. The formation of tension wood is induced by ... decreases with increasing height, following the trend of increasing density. 3.4. Veneer quality – Density and mechanical properties of plywood Figure 4 gives an overv...

Ngày tải lên: 07/08/2014, 16:21

... representation of the measurements taken in or- der to record the profile of the stem in the XZ plane, and estimation of the cross section coordinates at the height Z. are the coordinates of the left ... slope of the tree (ε) was defined as the angle be- tween the vertical axis and the axis linking the centre of the cross- sections, while the local...

Ngày tải lên: 07/08/2014, 16:21

... exponentially from the beginning to the end of a tree ring [3, 5, 10, 12]. In an ideal case (Fig. 1A), the principle is easily applicable: a tree ring begins with E cells and once the index (density) value ... regardless of index value and not the inverse. Therefore, when dividing a tree ring into E and L zones, the aim of this method will be to classify cells in a radi...

Ngày tải lên: 08/08/2014, 00:22