Báo cáo lâm nghiệp: "Modelling the demographic sustainability of pure beech plenter forests in Eastern Germany" pot

... view of practitioners in the beech plenter forest in Thuringia [9, 12–15]. They all considered a standing volume of about 250 m3/ha to be the upper limit to maintain the plenter system in these ... muchhigher in beech forests than in conifer-dominated ones. It alsoexplains why there has been little or no success in the past whenapplying the principles of the plenter system to broad-leaved forests ... estimation is the most sensitive point in the equilibrium model. According to the rule of sustainability, the sum of removal must correspond to the whole increment (in terms of basal area increment...

Báo cáo lâm nghiệp: "Modelling the biomechanical behaviour of growing trees at the forest stand scale. Part I: Development of an Incremental Transfer Matrix Method and application to simplified tree structures" pptx

... according to the following algorithm: from the begin-ning of tree growth, we have in the law (4) for every GU, i.e. the stem cannot react; during cycles of growth, if the leaning angle of one ... direction of the bearing element. The secondary straightening up is induced by a differential of mat-uration strains in the plane of flexion which is due to the presence of reaction wood. Stimuli of ... vector at the origin and the extremity of the beam are denoted by and respectively, according to the definition (A.3). Thesevectors contain the displacements from to and the internal forceincrements....

Báo cáo lâm nghiệp: "Modelling stand basal area growth for radiata pine plantations in Northwestern Spain using the GADA" doc

... radiata pine plantations 613identical for all the measurements belonging to the same unthinnedgrowth period within a single plot, hereafter the individual being in- vestigated. During the fitting ... for Pinus pinaster stands in Galicia. In summary, taking into account the adequate graphs pro-vided by model BA2 (Fig. 1) as well as the values of the goodness -of- fit statistics obtained in the ... wereobtained from two different sources. Initially, in the winter of 1995 the Unidade de Xestión Forestal Sostible of the University of Santiagode Compostela established a network of 223 plots in pure...

Báo cáo lâm nghiệp: " Modelling the influence of winter frosts the development of the stem canker of red oak, caused by Phytophthora cinnamomi" doc

... at the beginning of the win-ter. Then, it estimates the influence of frost on the survival of the pathogen present in thoselesions. For this, the model estimates the ... during winter and recolonisation of the lower trunk during the growing sea-son. During the period 1985-1987, the model predicted a lower survival of P cin-namomi in the ... autocorrelation of the annual evolu-tion of the PPA (AEi) was not significant in any of the four plots. In some years, the PPA increased simultaneously in all the plots. The increase...

Báo cáo lâm nghiệp: "Modelling the coppice stand structure: an ecophysiological approach" ppsx

... growing evidence about the influence of water deficits on the develop-ment of insect or pathogen problems thateventually result in a general decline of these forests. Therefore, ... leaves weregenerally inclined towards the ground,whereas in the coppice they were pointingupwards. The information about canopy structureand the response of physiological parame-ters ... 1985).A promising approach consists of the implementation of ecophysiologicalmodels that include the description of the structure of a forest stand together with the relationships...

Báo cáo lâm nghiệp: "reproductive and morphometric characteristics of wild boar (Sus scrofa) in the Czech republic" pot

... (without the ending and often extended hairs), metatarsal length (LTp) from the calcaneal joint to the tip of the hoof, ear length (LA) from the root of the ear to the tip, and height at the withers ... suggest the opinion, that in Doupov region can absent the dominate female. But on the other side, many of sudies describe the absence of adult male as main factor aﬀecting the time of far-rowing ... as the distance from the tip of the fore leg to the highest point at the withers. Weight was deter-mined according to circumstances: (i) the whole undressed individual, (ii) the weight of...

Báo cáo lâm nghiệp: "Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length" pdf

... height of insert point of the highest branch and the height of insert point of the branch of interest). In every annual shoot of the stem, the branches were ordered from the top to the base according ... calculate the insert height of the branchesto the pith level. hr is the calculated insert position of the branches to the pith level: hm is the measured position of the branch inserted on the trunk, ... is the measured height of insert point of the branch to the trunk, ri+1is the radius of the stem measured below the branch atheight hi+1, riis the radius of the stem measured above the...

Báo cáo lâm nghiệp: " On the niche breadth of Fagus sylvatica: soil nutrient status in 50 Central European beech stands on a broad range of bedrock types" potx

... any of the soil chemical properties in- vestigated in the organic layer or the mineral soil (Tabs. IVand V). The accumulation of N in the organic layer was highlydependent on Alex in the mineral ... saturation in the mineral soil are key factors for the accumulation of C and N in the organic layer. The total pool of phosphorus was particularly large in the organic layer of the Tertiary sands and the ... on top of the soil was not ex-erted by chemical properties of the organic layer itself. Instead, the pool of exchangeable aluminium (Alex) in the mineral top-soil was found to be the single...

Báo cáo lâm nghiệp: ": Climate-tree-growth relationships of Quercus petraea Mill. stand in the Forest of Bercé (“Futaie des Clos”, Sarthe, France)" docx

... slow increase from the beginning of the 20th century. Between 1910 and 2001, ring-width hasincreased of about 50%. The growth pattern of the sampledtrees was in agreement with the stand growing ... variability of the estimates. The subsampling is doneby random extraction with replacement from the initial data set. The size of each subsample is the same as that of the initial data set (n =81 in ... 2003)Abstract – The past history of a 300-year-old Quercus petraea stand (the “Futaie des Clos”, 8 ha) located 20 km from the town of Le Mans in the Forest of Bercé in the western part of France (Sarthe)...

Báo cáo lâm nghiệp: " from the simple application of a mixture of to more gibberellins integrated explanations" pot

... demonstrated thatflooding greatly increased the production of 1-amino-cyclopropane-1-carboxylic acid(ACC) in the roots and ethylene in the shoots of Pinus halepensis. In a recentexperiment ... question of impropertiming, since treating Norway spruce withethrel alone doubled the number of femalecones (Remrod, 1976).Timing of flower initiation The proper timing of treatment ... cuttings were treatedeither by stem girdling or by root floodingat the end of shoot elongation. The level of ACC and its malonyl form (MACC) in- creased rapidly in the...

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