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

... Lamina angle was88° + 4.27 for standards and coppice pooled together, indicating that the laminawere generally not tilted. The midrib anglewas higher for the standards than ... are trees, managed on a longer rotationthan the coppice, to produce seeds for the regeneration of the stand. The rotation intervalis 18 yr for the coppice and a multiple ... aver-age standard had a leaf area of 150.3 m2.Over the whole stand, standard leaf arearepresented approximately 50% of the leafarea displayed by the stand. The leaf...

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

... is not always located at the same distance of the pith and their intensity is significantlydifferent for tree T3. These gaps can be explained by the delayor advance of the reaction processes. ... reaction occurs ( ) if its leaning angle is greater than and there is no reaction otherwise ( ). Note that the thresholdangle , which is the same for every GU, can be defined for each cycleof ... inves-tigating wood production and wood quality at the stand level.Some models consider the position of trees in the stand, in orderto take into account the competition effects or the influence ofenvironmental...

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

... land use (coppice with standards) andits status as a communally-owned and -utilised forest [6]. They are sit-uated in the private Langula-Oppershausen corporative forest. Thereis a long-standing, ... forestsand can be explained by the fact that GCUM depicts stand clo-sure differences. The sharp decrease of id with increasing stand closure (GCUM) for trees in the lower part of the stand is ... that the deeper the trees are in the stand, the darker the shade and the more restricted condition for upgrowth. This explains whytolerance to shade is a limiting factor when considering the...

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

... because they had a canker of lessthan 1.5 m height. The disks were air-dried atroom temperature and then sanded.Quantification of the annual developmentof the trunk cankersFigure ... dramaticin Doat than in the other stands.As predicted by the model, a smallercanker development on the northern sideof the trunk compared to the southern sidewas observed ... for the treesof Doat than for the three others stands: the In computed was 0 in 1985 and 1987 for the Doat plot. It was never 0 for the trees of Ain-hoa and Mixe,...

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

... on the ageof the stand and other stand variables (theoretically the productive ca-pacity of the site and any other measure of stand density), it is gener-ally necessary to relate X to these ... parameters.Another important step in evaluating the models was to performgraphical analyses of the residuals and the appearance of the ﬁttedcurves overlaid on the trajectories of the stand basal area ... radiatapine plantations in Galicia is:ˆY = −52.23 + 2.676t + 1.306S + 0.0101N (5)where t is the age of the stand (years), S the site index (m,deﬁned as the dominant height of the stand at the referenceage...

Báo cáo lâm nghiệp: " Humus conditions and stand characteristics of artificially established young stands in the process of the transformation of spruce monocultures" pdf

... occurs in the stand of larch with beech (52.6 t/ha) and the statistically lowest one in the unmixed beech stand (22.0 t/ha). e mixed stand of spruce with beech and the spruce stand repre-sent ... On the basis of determined results we can conclude that the reserve of the mixed stand of spruce with beech approaches more the unmixed spruce stand than the unmixed beech stand. We can state ... significant differences on the level of significance (α < 0.05) occurred between the unmixed spruce stand and mixed stand of spruce with beech, between the unmixed spruce and beech stand, mixed stand...

Báo cáo lâm nghiệp: "Modelling of the shape of red heartwood in beech trees (Fagus sylvatica L.) based on external tree characteristics" potx

... On the other hand factors like the mean increase of dbh and the num-ber of oxygen entrances were reported to better explain the characteristics of red heartwood (probability, diameter) than the ... the formation of the observed red hearts, i.e. they influenced theirheight and length, too. Developing approaches to the quantifi-cation of the effect of single dead branches/branch scars on the ... height the mean red heart radius was found to be re-lated to the mean tree radius at this tree height and to the dis-tance to the crown base [17]. In a multiple regression analysisbased on the...

Báo cáo lâm nghiệp: "Optimising the management of Pinus sylvestris L. stand under risk of fire in Catalonia (north-east of Spain)" ppsx

... addition, the stand age and the site index(dominant height at 100 years) of the forest stand are needed. The ini-tial stand data used in this study came from plots measured during the Second Spanish ... stands, and 4.87% for all pinestands. These observations led us to use the range from 0 to 5%,considering the high variability in the fire risk of individualstands. In most optimisations the ... year was generated(a random number between 0 and 5) and the simulation of stand devel-opment began again from a zero-year-old stand. The simulation con-tinued until the stand accomplished a full...

Báo cáo lâm nghiệp: "Modelling canopy conductance and stand transpiration of an oak forest from sap flow measurements " docx

... incorporates the influence of aerody-namic and canopy conductances. The for-mer depends on roughness properties of the canopy, and the latter is considered as the sum of the stomatal ... and vapour flow at stand level and derivation of canopy conductance for Scotspine. Theoret Apl Climat (in press)Jarvis PG (1975) Water transfer in plants. In: Heat andMass ... sapwoodand crown class distribution in the stand. Canopy conductance was evaluated fromsap flow and climatic measurements using the Penman-Monteith equation (Monteith,1973), and...

Báo cáo lâm nghiệp: "On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic" potx

... regions of the Czech Republic; (i) Euhercynicum (the Šumava Mts., Slavkovský les, Český les, Brdy Upland and Žďárské vrchy Upland), (ii) Sudeten (the Krkonoše Mts. and the Krušné hory Mts.) and ... Entomology, 23: 99–108.Table 3. Results of the redundancy analysis of explanatory variables, their significance and correlations with the axesExplanatory variable AX1 AX2 AX3 AX4 P F I. F.2002 –0.4737 ... cultural forests prevailed and C. abietis was the most abundant species in the cultural forests at first appearance (Table 1), the variable of management was not significant. e collected material...

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