Báo cáo lâm nghiệp:"Analysis of log shape and internal knots in twenty Maritime pine (Pinus pinaster Ait ) stems based on visual scanning and computer aided reconstruction" pptx

... (200 3) 137–144 © INRA, EDP Sciences, 2003 DOI: 10.1051/forest:2003006 Original article Analysis of log shape and internal knots in twenty Maritime pine (Pinus pinaster Ait. ) stems based on visual ... differences between logs in relation to proportion of knot-free wood (figure 2). Figure 1. Log shape and internal knots reconstruction...

Ngày tải lên: 08/08/2014, 01:21

... consists in the so far unresolved issue of economic conception of non-wood-producing forest functions Table 8. Trading income of business entities according to selected operations (CZK/ha) Operation ... wood-producing function [e division of forest functions into wood- producing and non-wood-producing functions is laid down in § 2 of the Forest Act currently in force....

Ngày tải lên: 07/08/2014, 03:22

... Enterprise in Kostelec nad Černými lesy has a long tradition and is mainly connected with Liechtenstein estate. On the area of 6,734 ha, Douglas fir occurs in 98 stands and its proportion ranges ... the negative in uence of weeds on seedlings. e present study is the continuation and enlargement of such research. e aim of the study is to confirm the utility and...

Ngày tải lên: 07/08/2014, 03:22

... 15 Age classes Proportion ( %) 1980 1996 2003 Fig. 1. Proportion of stand area (thin line) and growing stock (thick line) of broadleaved tree species in age classes in 1980, 1996 and 2003 0 5 10 15 20 25 30 35 40 45 1 ... felling ( %) 1980 1996 2003 Fig. 2. Planned decennial percents of tending (thin line) and regeneration timber felling (thick line) of broadleaved...

Ngày tải lên: 07/08/2014, 03:22

... beech stands in the winter season 2005/2006 nor in the following two winters in the period of snow accu- mulation. Snowpack investigation and calculation of daily changes of water stored in snow ... spruce and beech stands, overland flow including the lateral flow of water through soil (interflow) ranged at a level of ± 4% of winter precipitation in 2005/2006. In...

Ngày tải lên: 07/08/2014, 04:20

... reasons for the decline of these stands can be the lack of nutrients contained in soil environment as well as in needles. One of the possible ways of revitalization can be the compensation of ... result in an overapplication of lime in 9% to 12% of the field and an underapplication on 37% to 41% of the field. When analyzing older cases, one of the main findin...

Ngày tải lên: 07/08/2014, 10:21

... border of the for- est ground belonging to the Křtiny Training Forest Enterprise (Fig. 2). e measurement in area A was tested at 9 points of known coordinates and in area B at 7 points. Individual ... natural conditions of the forest stand are considered, the attained horizontal accuracy (after corrections) is sufficient for many applications in forestry, and further imp...

Ngày tải lên: 07/08/2014, 10:21

... k 1 ( 1), k 2 ( 1), k 3 ( 1), k 4 ( 1), h i (m), l i (m), w i ( 1); – Equation ( 2): k 0 ( 1), h i (m), l i (m); – Equation ( 3): k  1 ( 1), k  2 ( 1), k  3 ( 1), k  4 ( 1), h i (m), w i ( 1); – Equation ... l i and w i of Equation ( 1) is given in Figure 3. In general, an increase of h i results in an increase of the height of the red heart...

Ngày tải lên: 07/08/2014, 16:20

... were found by Lange and Weiβmann (199 1) [7] in oleoresin of P. pinea; the last seven acids in wood and bark by Hafizoglu (198 9) [5], and the first six, in soil of a P. pinea forest and in plant material ... oleoresin produc- tion, which consisting mainly of limonene and abietic and levopimaric acids [7, 12], to be used as seed produc- ers [3]. The tapping of...

Ngày tải lên: 09/08/2014, 04:20

... situation in the codominant (main) layer while trees belonging to class 3 have slimmer stems. However, data indicate that a silvicultural intervention also in the main layer is needed in the ... 5 mm), tree height (to the nearest 0.5 m), size of the crown (vertically and horizontally) and tree class evaluation (according to Konšel’s classification). e stand is at an altit...

Ngày tải lên: 07/08/2014, 03:22