Báo cáo lâm nghiệp:"Estimation of crown radii and crown projection area from stem size and tree position" pps

... 207–231.[4] Bréda N., Granier A. , Intra- and inter-annual variations of transpi-ration, leaf area index and radial growth of a sessile oak stand (Quercus petraea), Ann. For. Sci. 53 (1996) 521–536.[5] ... robur (L.) stand from 1999 to 2001. I. Trees and forest floor daily transpirationCaroline VINCKE a *, Nathalie BREDAb, André GRANIERb, Freddy DEVILLEZ a a Unité des Eaux et Forêts, Faculté ... 265–274.[22] Granier A. , Anfodillo T., Sabatti M., Cochard H., Dreyer E.,Tomasi M., Valentini R., Bréda N., Axial and radial water flow inthe trunks of oak trees: a quantitative and qualitative analysis,...

... several ways according to leaf areadevelopment. For periods of leaf area expansion and leaf fall, daily transpiration was calculated with an equation based on daily PET and on a relative LAI (LAIi/LAImax), ... from 1999 to 2001. II. Daily actual evapotranspiration and soil water reserveCaroline VINCKE a *, André GRANIERb, Nathalie BREDAb, Freddy DEVILLEZ a a Unité des Eaux et Forêts, Faculté ... each plot’s basal area, LAI and SA for the3 years and for each type of species. Total LAI was estimated from litterTable I. For each year and each plot (Th.: Thinned; C.: Control): (a) basal...

... pine. The uncertainty in the biomass estimates of birch was high, since the number of birch stands was low in both the material used for formulation of the BEFs, and in the Swedish data on which the ... Svealand and Götaland regions. In Svealand, the use of BEFs for Norway spruce in young stands resulted in lower, and in mature stands, higher biomass estimates than diduse of the biomass equations. ... quantify and reduce the uncertainties involved in BEFs by developing uncertainty esti-mation and by taking into account the variation in the allometry of trees. Since allometry varies according to...

... vegetation. The total stock, in tC, for the whole of Fougères forest was therefore the sum of the stocks in all the plots. Then the range of the total stock was calculated and the corresponding map ... the vegetation. From the statistical analyses and existing maps these point data were extrapolated to the whole forest using two changes of scale. The total carbon stock was estimated to lie in a range ... proportion of the carbon, in the order of a quarter of the stocks in the veg-etation [14, 41]. Variations in the stocks in the vegetationdepend on the age and nature of the stands but also on naturaldisturbances...

... 10.1051/forest:2003011Original article Comparison of soil water-contents as measured with a neutron probe and time domain reflectometry in a Mediterranean forest (“Sierra de Gata”, Central Western Spain)Mar a Amparo ... usefulinformation about the actual evapotranspiration, drainage, and leaching [14]. Over the past decade, interest in water fluxes in natural ecosystems has increased owing to the appearance of evidence ... of evidence of changes in the annual distribution of rainfall and a hypothetical reduction in the actual evapotranspiration as a consequence of the global change [4, 21], and alsohydrological changes induced...

... articlePredicting of oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part II: Computation of macroscopic properties and microscopic stress fieldsPatrick Perré and ... homogenisation: Part II of this paper is devotedto the calculation of the macroscopic properties and the determination of the microscopic stress fields that result from the macroscopic configuration. Computational ... É., Perré P., Predicting Oak Wood Properties using X-ray Inspection: Representation, Homogenisation and Localisation. Part I: Digital X-ray imaging and representation by Finite Elements,Ann....

... 10.1051/forest:2003031Original articleEstimation of crown radii and crown projection area from stem size and tree positionRüdiger GROTE*Chair for Forest Yield Science, Department of Ecology and Landscape Management, ... determination of radius length and potential crown cover (pr1 and pr2: maximum radii, alin1 and blin1:linear radii estimation, alog and blog: logarithmic crown area estimation, alin1 and blin2: linear crown ... values derived from eithermeasured or simulated crown radii. Additionally, crown over-lap is calculated from the difference between the sum of single tree crown projection areas and canopy cover....

... nitrification in non-nitrifying soil, although mineralisation increased. Finally, Barg and Edmonds [4] found no change in mineralisation and nitrification rates after partial or total clear-cut, as ... containing an anion resin bag and six cylinders containing a cation resin bag were set up. Finally, at the beginning of October 1996, the quantity of resin in each cylinder wasdoubled by adding ... and drainage of mineral N were calculated as the product of the water flux(throughfall and soil leaching respectively) and N -N and N -Nconcentrations in solutions. Drainage of water was calculated...

... 5) with a core of clones between 37 and 44 degrees Estimation of genetic parameters in the European black poplar (Populus nigra L.). Consequence on the breeding strategyCh. ... discussion, need tobe based on the genetic and economic properties of the species. The present study aims toestimate the genetic parameters in the European black poplar, ... the length of the growing season is under strong genetic control. It also matches results on Populus deltoides (FARMER, 1970 ; YtN!,1974) and on many other species of...

... ultrapure wateras eluant.2.4.3. Amino-acid analysisExtraction was carried out at 4 °C. 40 μL of an internal standard (α-butyric acid) wereadded to samples ... of primary leaves), of the tap root (TR) and of the three longest lateral roots (LR; as an assessment of the length of the lat-eral roots) of each plant were measured ... deficiencies induced dif-ferent responses in tap and lateral roots in terms of growth, solutes involved in Kreplacement and efficiency in maintenance of turgor and osmotic pressures....