Báo cáo lâm nghiệp: "Variation in the composition and content of ellagitannins in the heartwood of European oaks (Quercus robur and Q petraea) A comparison of two French forests and variation with heartwood age" ppt
Báo cáo lâm nghiệp: "Variation in the composition and content of ellagitannins in the heartwood of European oaks (Quercus robur and Q petraea). A comparison of two French forests and variation with heartwood age" ppt
... colourOriginal article Variation in the composition and content of ellagitannins in the heartwood of European oaks (Quercus robur and Q petraea). A comparison of two French forests and ... relating the total soluble ellagitannins and heartwood age was calculated. In a second study two heartwood samples were taken from each of 20 oak trees (Q roburand Q petraea) ... identification of nine of these 12 ellagitannins (fig 1). Purifiedsamples of vescalagin, castalagin, grandinin and roburin A (kindly provided by Dr Scalbert, INRA,Paris) allowed...
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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
... 10). The comparison of means, using the analysis of variance, showed that when the effect of dbh and height was eliminated the mean values of tapering of individual partial populations did ... is index is a relative measure of density elaborated for even-aged stands, and it is determined on the basis of the number of trees per hectare (TPH) and the quadratic-mean dbh (d q ) (equation ... compare the values of form factors of individual provenances. On the basis of the corrected coefficient of determination it was stated that a linear equation (equation 6) describing the relationship...
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Báo cáo lâm nghiệp:" Variation in the decay resistance and its relationship with other wood characteristics in old Scots pines" ppsx
... 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 sapwood and inner and outer heartwood of mature Scots pine stems ... that the mass loss in the periphery part of the heartwood was lowerthan that in the centre of the heartwood. The other marked dif-ference between the outer and the inner heartwood found in the ... (Coniophora puteana). The average mass loss in sapwood was 141 mg/cm3, in outer heartwood 57 and in inner heartwood 108. The variation between trees was largest in outer heartwood. The corresponding...
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Báo cáo lâm nghiệp: "Variation of stomatal resistance with leaf age in Quercus petraea: effect on the soil-water balance of an oak forest" pot
... soil-waterbalanceFig. 1 shows the strong decrease in sto-matal resistance with leaf age, expressedas the ratio of actual leaf area to its maxi-mal area. All these values ... h0" alt="" Variation of stomatal resistance with leaf age in Quercus petraea: effect on the soil-water balance of an oak forestJ. Nizinski,D. MorandB. SaugierLaboratoire d’Ecologie ... the effect of leafage on stomatal resistance and on the morphology of the leaf epidermis.Materials and MethodsStudy site: 2 stands of Q. petraea (Matt.) Liebl. in the...
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Báo cáo lâm nghiệp: "Variation of conducting area in stems of European larch (Larix decidua) growing in fresh mixed coniferous forest and fresh mixed forest sites" pdf
... conducting area – CA. Mean area of early wood per single annual ring was defined as the conducting area of a ring – CAar. Relative con-ducting area (CA.k–1) was calculated as a quotient of conducting ... Conducting area (CA) and ring conducting area (CAar) seem to be the values that may describe the relationships between conducting area and the size of the assimilating and transpiration organ ... Kruskal-Wallis test for the value of CAar in analyzed Kraft’s social classes of tree position and inResults of the Kruskal-Wallis test for the value of CAar in analyzed Kraft’s social classes of...
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Báo cáo lâm nghiệp: "Forest transport roads according to natural forest regions in the Czech Republi" pps
... morphological types of terrain: in lowlands and ta-blelands with the slope of terrain to 15% 15 m/ha by obtainable efficiency 90% and average geometrical skidding distance 170 m; in highlands 22 m/ha ... optimal forest and forest stand management is their reasonable opening by a forest road network. e basic frameworks of forest road network are forest transport roads of various grades and categories.e ... engineering constructions and capital construction of forest road network which improve the optimal management of forests and forest stands and their reasonable opening by a forest road network....
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Báo cáo lâm nghiệp: "Variation in wood volatile compounds in a mixed oak stand: strong species and spatial differentiation in whisky-lactone content" pptx
... a continuousforest of 700 ha, consisting mostly of naturally regenerated mixedstands of Q. petraea and Q. robur. The sampled stand covers approx-imately 5 ha with a total of 286 standing trees. ... consists of threeecological zones: a small valley, a plateau and a regular intermediateslope. The plateau is covered by a well drained soil and composed of sand and slit. The small valley is characterized ... datarather than on the actual values, were used.2.3.3. Spatial analysisWe have used the SGS software [11]. The spatial structure of con-tinuous quantitative traits can be analysed by applying a...
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Báo cáo lâm nghiệp: "Variation in wood properties among five full-sib families of Norway spruce (Picea abies)" ppt
... tothank: Björn Hannrup for initiating and leading the project; TapioJärvinen, Tapio Nevalainen and Kari Sauvala for sample prepara-tion and determing MOE and MOR; Irmeli Luovula for analysing the FTIR ... Norway spruce [19]. The grain angle (spiral grain) was measured by pulling a needleattached to an arm along the pith- and bark facing side of the boards. The needle followed the grain and left a ... sig-nificant in comparison to the findings in loblolly and radiatapine [4, 29]. However, the observed MfA values, with a mean of 11◦ and a variation from 8◦to 20◦, indicates that the ma-jority of...
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Báo cáo lâm nghiệp: " Variation of the photosynthetic capacity across a chronosequence of maritime pine correlates with needle phosphorus concentration" pptx
... focused on quantifying the possible change in photosynthetic capacity with increasingtree age.Declining nutrient availability during stand developmentadversely affects tree leaf area and leaf photosynthesis ... stands either for the quantum use efficiency (α) or darkTable II. Characteristics of the sampled trees in each maritime pinestand. The tree leaf area was calculated using an allometric rela-tionship ... inducing lower Ci, and decreasing ∆. Moreover, the lower value of ∆ in the 32-yr-oldstand can be explained by the higher values of photosyntheticcapacity and intermediate level of stomatal...
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Báo cáo lâm nghiệp: "Variation of morphological traits in natural populations of maritime pine (Pinus pinaster Ait.) in Morocco" pot
... on the variations in growth and quality characteristics of Pinus pinaster Ait. prove-nance trials in Turkey, Ormancilik Arastirma Enstitusu Yayinlari,Ankara, 1985.[52] Vendramin G.G., Anzidei ... objective of the present work is the analysis of the variation in morphological traits within and among Moroccanmaritime pine populations. In addition, we are interested in the comparison between patterns ... 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, populations PC and KRgrow in major alluvial plains...
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