Báo cáo lâm nghiệp: "Variation of the tree form factor and taper in European larch of Polish provenances tested under conditions of the Beskid Sądecki mountain range (southern Poland)" docx

... University of Cracow. Variation of the tree form factor and taper in European larch of Polish provenances tested under conditions of the Beskid Sądecki mountain range (southern Poland) J. S 1 , ... estimation of variation of the tree form factor for all data within individual provenances was done in several stages. Since...

Ngày tải lên: 07/08/2014, 10:22

... planting to the trees of the 32-yr-old stand; indeed, the other stands of our chronosequence never received any fertilisation. The ∆ of annual ring cellulose decreased significantly with increasing ... lower value of ∆ in the 32-yr-old stand can be explained by the higher values of photosynthetic capacity and intermediate level of stomatal conductance meas- ured i...

Ngày tải lên: 08/08/2014, 00:22

... identification of nine of these 12 ellagitannins (fig 1). Purified samples of vescalagin, castalagin, grandinin and roburin A (kindly provided by Dr Scalbert, INRA, Paris) allowed ... concentration during the first 10 years of ageing and roburin C over the first 30 years, before each declines again in older wood. Grandinin and roburin E s...

Ngày tải lên: 08/08/2014, 18:21

... the effect of leaf age on stomatal resistance and on the morphology of the leaf epidermis. Materials and Methods Study site: 2 stands of Q. petraea (Matt.) Liebl. in the ... porometer) in the middle of the day; leaf size (Delta T area meter) and the observation of the abaxial epidermis (scanning electron micro- scope). Observati...

Ngày tải lên: 09/08/2014, 04:20

... – the radius of a circle to the beginning of early wood, R – the radius of a circle to the beginning of late wood, P – earlywood area in annual ring. Total area of early wood rings within the ... death of parenchymal cell stabilizes the size of conducting area in trees of younger age classes, and then the cause and effect of the interre- lationship i...

Ngày tải lên: 07/08/2014, 10:21

... the height of the tree at the end (H 2 ) and at the be- ginning (H 1 ) of the five year period, as well as the difference between the age at the end of the period (T 2 ) and the age at the beginning ... for the site index (SI) (a) and the stand age (b). Figure 4. Ordinary kriging prediction of the age of the stand obtained using Equation 1 (a) an...

Ngày tải lên: 07/08/2014, 16:20

... of the boards. The demarcation be- tween earlywood and latewood in each ring was set to be the point where light intensity was 30% of the difference between the mini- mum and maximum within ring ... by pulling a needle attached to an arm along the pith- and bark facing side of the boards. The needle followed the grain and left a track in the wood. The an...

Ngày tải lên: 07/08/2014, 16:21

... PACL in the study areas. The goal of the first and second buffers is to provide the necessary edge for light simulations. The crowns of the trees in the first buffers are measured exactly as in the ... in Plot 2. The sensors were installed at an interval of 4 m along the transects, and at a height of 1.5 m, except near the edge of the gap in th...

Ngày tải lên: 08/08/2014, 00:22

... population of TAD. In contrast, seeds and cones were largest in the high Rif and smaller in the low lands. Precipitation in the high-altitude Rif is two-fold the precipitation in the lowlands. In fact, ... and weight), seed wings (length and width) and needles (length, width, thickness and the number of stomata rows on the dorsal and convex faces o...

Ngày tải lên: 08/08/2014, 00:22

... importance of the individual factors contributing to the natural durability of Scots pine wood. The variation in the in vitro decay rate, and in the extractive content and sorp- tion of water by the ... heartwood. The other marked dif- ference between the outer and the inner heartwood found in the present study was in the concentration of pinosylv...

Ngày tải lên: 08/08/2014, 01:21