Báo cáo lâm nghiệp: "Frost resistance of seeds in Mediterranean oaks and the role of litter in the thermal protection of acorns" docx

... freezing and exotherm profiles for the four species studied (in increasing order of frost resistance) . Exotherms representedare obtained from mean values of starting point, width and duration of ... leaf litter cover which protected acorns duringwinter. The insulating role of leaf litter along a winter season in a Q. faginea stand in the Zaragoza province was monitoredto check its insulation ... now if thermal stress evitation mechanisms(supercooling) of seeds of certain mediterranean oak speciesare capable of guaranteeing the survival to winter conditions in their most continental...

Báo cáo lâm nghiệp: "Designing decision support tools for Mediterranean forest ecosystems management: a case study in Portugal" pptx

... both the minimum and the maximum number of years of a land unit debark-ing cycle and the timing of the first debarking for each land unit. In order to run this model the prescription simulator interprets ... encompasses the defini-tion of both the debarking cycle for each tree in the land unit and the thinning regime. The prescription simulator may consider threedebarking models. The inputs to the first ... constantly being changed and improved. Furthermore, the storage of data from other Mediter-ranean ecosystems in the MIS may induce the insertion of new models in the system. Thus, the architecture of...

Báo cáo lâm nghiệp: "Frost damage on the terminal shoot as a risk factor of fork incidence on common beech (Fagus sylvatica L.)" docx

... for the damage levels observed. To complete our under-standing of the eﬀect of damage and consequently our under-standing of the eﬀect of late frosts we need to carry out the same kind of “cohort ... height of 50 cm were all of the same local origin (Arques stateforest in Normandy).During the night of 14/15 May 1995, a frost aﬀecting the whole of France [23] was particularly severe in the ... decision to consider only the forks developed on the 1994 shoot of the main axis was in line with the aim of ourstudy which was to determine and quantify the most directeﬀects of the frost. However...

Báo cáo lâm nghiệp: "How long can seeds of Norway spruce (Picea abies (L.) Karst.) be stored?" pps

... collected in 1973 and the seeds wereextracted from them in the extraction plant Wolfgang in Hessia. Aftercleaning, dewinging and drying, the seeds were stored there in sealedcontainers at a ... germinated seeds were planted into the boxeswith moist perlite and placed in the Jacobsen tank at the same level as the germinating seeds, in the same conditions of temperature and light. Seeds ... cones in the Jarocin (Poland)extraction plant. In Kórnik they were dewinged, immediately sub-jected to moisture content assessment, cutting test, and germinationtest, and the remaining seeds...

Báo cáo lâm nghiệp: " Decay resistance in Dicorynia guianensis Amsh.: analysis of inter-tree and intra-tree variability and relations with wood colour" pptx

... mass loss rather than the mean in interpreting the results improves the reproducibility of the results, and reduces the impact of singular results that can-not be explained [49]. The median mass ... is darker and redder in the outer heartwood and at the base of the tree.4.Decay resistance decreases from the outer to the innerheartwood. Variations from the base to the top of the trees areless ... treediameter and sapwood thickness: the thinner the sapwood, the greater the tree diameter and the lower the decay resistance. 3.Colour is related to height and radial position in the tree: the wood...

Báo cáo lâm nghiệp: "Drought conditioning improves water status, stomatal conductance and survival of Eucalyptus globulus subsp. bicostata seedlings" ppt

... walls as these mayfacilitate the maintenance of cell integrity during the rehydra-tion occurring after the drought ends. In contrast to SS plants,CS plants experienced an increase in the θ and ... topsoil of medium texture, and sand(3:1) (v/v) on August 1999. Seedlings were maintained during the whole experiment in a glasshouse located in the experimental ﬁeld of the Faculty of Agronomy, ... g−1d−1) = ln M2–lnM1/ t2– t1,whereM1 and M2are dry mass at the beginning and the end of the samplingperiod, and t1 and t2are the dates of sampling [19].2.5. Stomatal conductanceLeaf...

Báo cáo lâm nghiệp: "Fertilization at planting impairs root system development and drought avoidance of Douglas-fir (Pseudotsuga menziesii) seedlings" pot

... 33, 55, and 65% of total N, 6, 15, 15, and 24% of P2O5, and 9, 16, 34, and 51% of K2Oreleased from the fertilizer during the first 13, 20, 27, and 35 weeks,respectively. During the approximately ... period of the presentstudy, 55% of the fertilizer released by weight and 73% of total N, 26% of P2O5, and of 63% of K2O released. This was 87–92% of the totalreleased for all variables during ... available concerning the ability of field-fertilizedseedlings to avoid drought immediately following planting.This experiment was designed to examine the influence of ini-tial root volume and field...

Báo cáo lâm nghiệp: "Harvest scheduling with spatial aggregation for two and three strip cut system under shelterwood management" docx

... units in one direction, most often into the prevailing wind. Strip width is generally set at four times the average dominant height of the target for-est stand. For this site, a total of 58 ... NB(i) as the index number of a strip adjacent to the i-th strip against the pre-vailing wind. en, after completing the recursive operation four times – for the two-cut system – we have the following ... with others (as in Fig. 3). In other words, a strip that is a member of the i-th aggregated Table 3. Example of allocation and cutting progress of three-cut shelterwood systemPeriodWind ⇒cutstrip1...

Báo cáo lâm nghiệp: "Wedge prism as a tool for diameter and distance measurement" ppsx

... between the stem volume and the diameter at breast height.e method of measuring the diameter at a certain height of the tree is also appropriate for the sorting in standing trees. For sorting ... calculating the volume in forests (virgin forests) where the yield tables do not exist or for the revision of the existing tables. e stem is divided into parts and they are calculated using the ... determining the tree diameter at breast height (B 1996).For testing the accuracy of the method the laser telemeter was used and then the measured diameter was measured using the calliper...

Báo cáo lâm nghiệp: "Linking intra-tree-ring wood density variations and tracheid anatomical characteristics in Douglas ﬁr (Pseudotsuga menziesii (Mirb.) Franco)" pot

... characteristics independently, in order toevaluate their relative in uences on wood density. For the ﬁrstset of simulations, all the variables in the model were ﬁxedto values they take at the beginning of ... MMDadecreasedwithin the ﬁrst half of a tree-ring; then it reached a plateau, and remained constant in the second half of the tree-ring (Fig. 2B).Correlations were high between the diﬀerent morphomet-ric ... set of simulations: all the variables of the model (Eq. (5)) are ﬁxed to their ini-tial values except the variable of interest bywhich the corresponding curve is labelled.B. Second set of simulations:...

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