Báo cáo lâm nghiệp: "A model of with even-aged beech stands productivity process-based interpretations" doc
Báo cáo lâm nghiệp: "A model of with even-aged beech stands productivity process-based interpretations" doc
... part of a largerproject aimed at modeling growth of pure even-aged stands of common beech, onthe basis of a network of permanent plotsobserved since the turn of the ... generalization of Eichhorn’s ruleThe data analysis of the 3 previous sec-tions provides a model for the 3 compo-nents of productivity in even-aged beech stands: where α, ... sap-wood area is taken at crown base (Granier,Original articleA model of even-aged beech stands productivity with process-based interpretationsJF DhôteLaboratoire de recherches...
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Báo cáo lâm nghiệp: "A model of light interception and carbon balance for sweet chestnut coppice (Castanea sativa Mill.)" pdf
... cut. Wedesigned a model to predict photosynthe-sis of heterogeneous canopies and woodrespiration. The output of the model to-gether with measurements of aerialgrowth enabled ... between thefoliage of different trees until the end of the firstyear. The leaves in the model were distributedhomogeneously within ellipsoids or fractions of ellipsoids around ... shows the tree photosyn-thesis-light curve (by unit leaf area of thetree) compared with the outputs of the model for a single tree and for twolight conditions. The light...
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Báo cáo lâm nghiệp: "A survey of forest pollution with heavy metals in the Natural Forest Region (NFR) Moravskoslezské Beskydy with particular attention to Jablunkov Pass" docx
... JablunkovFig. 4. Content of chromium (median) (mg/kg) in soil profiles of spruce (left) and beech (right) stands Table 4. Median of contents of elements in both compared stands (mg/kg)N (g/kg) ... the area of the Pass. is is confirmed by the highest values of the median: Zn = 103 mg/kg in contrast with 70.6 mg/kg in spruce stands and 121 in contrast with 101 mg/kg in beech stands in ... in con-trast with 88.6 mg/kg in spruce stands and 93.6 in contrast with 83.3 mg/kg in beech stands in the NFR, Cd = 1.02 mg/kg in contrast with 0.69 mg/kg in spruce stands and 1.28...
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Báo cáo lâm nghiệp: "A comparison of two modelling studies of environmental effects on forest carbon stocks across Europe" ppsx
... causes of the observed acceleration of forest growth: weather conditions, atmospheric concentrationFigure 8. Variation of mean countryNet Ecosystem Productivity with latitude of centre of country ... the effect of many more variables e.g. nitrogendeposition, than the ecosystem model which allowed a moredetailed assessment of the relative importance of the variablesand of source of uncertainty.Characteristics ... uncertainty.Characteristics of the two models are compared in Table I.2. CASE STUDY 1: THE EUROBIOTA FOREST SYSTEM MODEL 2.1. The model The EuroBiota forest ecosystem model primarily describesthe effect of changing...
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Báo cáo lâm nghiệp: " A collection of functions to determine annual tree carbon increment via stem-analysis" pot
... total treeC pool at year of felling. In even-aged stands stem C pool canbe modeled as a function of tree radius and its age. Coniferwood density can be a good proxy of radial increment [4, 18,27]. ... abies (L.) Karst. even-aged stands. Tree age, height and wood density can be good proxies of stem C pool in conifer even-aged stands. i: Cross-section increment numbern: Number of boles enclosed ... followthe profile of a paraboloid of Apollonius: ai = π · (wi + wi+1) ·(hi+1 – hi).Stem lateral surface area (A) is calculated as the sum of eachlog lateral area and the lateral area of the...
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Báo cáo lâm nghiệp: "A comparison of fitting techniques for ponderosa pine height-age models in British Columbia" potx
... height model is a key com-ponent for obtaining good estimates of the growth and yield of ponderosa pine.Four variations of the logistic model were fit to the data. Ineach variation, the basic model ... before fitting the model with thelag-1 sample autocorrelation [29, p. 279] calculated from the residualsin model (1). A different value of φ was estimated for each plot.Height models have a deterministic ... new height model for ponderosa pine is nowavailable for British Columbia. This model gives only slightly different height estimates from the current models, so the use of the previous model in...
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Báo cáo lâm nghiệp: " A comparison of the photosynthetic radiation response of Scots pine shoots in direct and diffuse radiation" pot
... exponential function of thelength of the photon pathway within the needlebefore reaching the point under consideration.ResultsMeasured rates of photosynthesis of ashoot subjected ... case of a highlydirectional field, and the rate of photosyn-thesis per unit of intercepted radiationshould logically be higher (cf. Oker-Blom,1985). The aim of this ... of the photosynthetic units of the shoot whichare assumed to have an invariant photo-synthetic light-response curve.* Present address: University of Georqia. School of...
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Báo cáo lâm nghiệp: "Viscoelastic behaviour of green wood across the grain. Part II. A temperature dependent constitutive model defined by inverse method" pot
... identification pro-cedure and guarantees the quality of the fitted parameters and the widerange of validity of the resulting constitutive model. 2.2. Simulation of the experimental testsThe creep function ... between softwood andhardwood is obvious. The glass transition of softening temper-ature for wood depends on the physical method used and theconstant of time. Nevertheless, differences between softwoodand ... compositionsbetween softwood and hardwoods: almost only guaiacyl unitsare present in softwoods and a mixture of guaiacyl and syringylFigure 5. Creep tests in the tangential direction of Oak. Evolution of the...
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Báo cáo lâm nghiệp: "A two-step mortality model for even-aged stands of Pinus radiata D. Don in Galicia (Northwestern Spain)" doc
... models e.g. [3, 23, 39, 40]. Theseresults are consistent with the dynamic process of the intra-spe-cific competition and the natural mortality of even-aged stands [8, 13, 36, 37].The use of ... number of plots without observed mortality over aperiod of t years and n0 is the number of plots with observed mortalityat the same period of time. The weight used was the inverse of where ... of these types of models are: a description of the forest state at a given pointin time; some transition functions to define the rate of change of the system depending on the current state of...
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Báo cáo lâm nghiệp: "Opportunistic methods of controlling vegetation, inspired by natural plant succession dynamics with special reference to natural outmixing tendencies in a gap regeneration" pps
... naturalprocesses of plant succession instead of composition types.Opportunistic silviculture makes use of natural plant dynam-ics. In the long term, natural development produces somewhatregular stands of ... 40]. In addition, the possible problem of speciesalternation arises for ash and sycamore: pure stands offer morefavourable conditions for the regeneration of the other species[39]. This seems ... Evolution of the distribution of tree numbers in the over-storey between years 3 and 15.152 J P. Schütz4. DIRECT SOWING OF STEERING VEGETATION TO IMPROVE FOREST SEEDLINGSThe principle of antibiosis...
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