Báo cáo lâm nghiệp: "Influence of tree species on gross and net N transformations in forest soils" ppsx
Báo cáo lâm nghiệp: "Influence of tree species on gross and net N transformations in forest soils" ppsx
... by15NO3production fromthe addition of 15NH4. In the plantations, gross and net mineralization and nitrification from pool dilution were lowest in the spruce stand and highest in the beech and Corsican pine ... balance between gross transformations of organic N into ammonium or nitrate and immobilisation of mineral N by living microorganisms. Net nitrification results from gross oxidation of ammonium and organic ... mineralization in spruce and Douglas fir respectively, and close to net mineralization in Corsican pine, beech and oak.3.3. Short term gross mineralization and nitrificationfluxes15 N remaining in the...
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Báo cáo lâm nghiệp: "Effect of tree species substitution on organic matter biodegradability and mineral nutrient availability in a temperate topsoil" pptx
... emission of compounds inhibiting nitrogen mineralization (i.e. 20000-foldless in clear-cut plot than in the forest) . Net nitrification was mainly the highest in soils originat-ing from beech and ... biodegradability and consequently on mineral element and major nutriments release and availability. The results showedthat carbon mineralization and nitrogen mineralization can bedivergent. Major differences ... conditions (15◦C, water-holding capacity). Carbon-mineralization was monitored; mineral nitrogen, water-extractableorganic carbon and mineral elements were determined before and after the incubation....
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Báo cáo lâm nghiệp: "Effects of microsite variation on growth and adaptive traits in a beech provenance trial." pps
... eff ect of environmental diff erences among trials on pheno-typic variation rather than its decomposing into the eff ects of single environmental factors. In any case, the study demonstrates that ... variation of environment aff ects growth and adaptive traits in a provenance trial, and whether blocking can effi ciently handle this variation.MATERIALS AND METHODS e study is based on the analysis ... and their values for the positions of individual trees were estimated by ordinary point kriging. The evaluation of phenotypic variation (height, diameter, Julian days of spring flushing and...
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Báo cáo lâm nghiệp: "Effects of selective thinning on growth and development of beech (Fagus sylvatica L.) forest stands in south-eastern Slovenia" docx
... of thinning methods varies due to differentcriteria, including the type of thinning, intensity (grade), re-turn interval, and the timing of the first thinning [48]. Twomajor types of thinning ... used in forest tending are low (frombelow) and high (from above) thinning. In low thinning, onlysuppressed trees are removed, whereas high thinning removesdominant and co-dominant trees in the ... thinning intensity).The high number of crop trees in the young stands and al-teration of crop trees caused one of the main weaknesses of the selection thinning type, namely, high costs. In...
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Báo cáo lâm nghiệp: "Element analysis of tree rings in pedunculate oak heartwood: an indicator of historical trends in the soil chemistry, related to atmospheric deposition" ppsx
... related to interannualchanges of climatic conditions and/ or of ringtranslocations inside the tree would proba-bly conceal the effects on the ring mineralcontent of possible ... Potential in usingelemental concentrations in radial increments of oldgrowth eastern redcedar to examine the chemicalhistory of the environment. In: Proc of the Int Symp on ... environmentalchanges. Experientia 42, 537-542Momoshima N, Bondietti EA (1990) Cation binding in wood: applications to understanding historicalchanges in divalent cation availability...
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Báo cáo lâm nghiệp: "Energy consumption of a chipper coupled to a universal wheel skidder in the process of chipping wood" pptx
... consumption. The main purpose was the determination of input power and comparison of revolution frequency on the outlet shaft of a skidder regarding the dimension of the torque depending on variable ... con-centration into lines, skidding to transporting plac-es, its dimensional homogenization, e.g. chipping, grinding, etc. Wood for energy production can come from either waste from technological ... process of wood chipping during the measurement and the analysis of energy consumption of a chipping machine was carried out.Keywords: chip; chipper; chipping; energy consumption; power of cuttingChipping...
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Báo cáo lâm nghiệp: " The influence of Picea abies on herb vegetation in forest plant communities of the Veporské vrchy Mts" ppt
... Calcare-36343230282624222018161412100.950.900.850.800.750.700.650.603.23.02.82.62.42.22.01.81.6EvennessNo. of species Shannon-Wiener index 1 2 3 1 2 3 1 2 3 Group Group GroupFig. 3. Number of species, evenness and Shannon-Wiener index (mean, standard error, standard deviation) for ... selection and unrestricted permutation and 999 runs. e Monte Carlo test was also used for significance testing of ca-nonical axis. Several factors (EIV, Shannon-Wiener index, number of species, ... Vegetation Science, 3: 123–134.E J. (2000b): e partial in uence of Norway spruce stands on understorey. Vegetation in Montane Forests of the Bavarian Alps. Mountain Research and Development,...
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Báo cáo lâm nghiệp: " The effects of cutting regimes on natural regeneration in submountain beech forests: species diversity and abundance" pdf
... cutting intensity. e ANOVA results document a significant in uence of cutting intensity on the abundance of both one-year-old and older seedlings. e abundance of beech seedlings was initially ... between the number of beech, hornbeam, fir, oak, linden and sycamore seedlings and the number of fructifying trees, stand density, illumination in the growing season – GS (illumination account ... this in uence was found positive on plot M only.Fig. 5 illustrates the in uence of cutting on changes in the species composition of natural regeneration in comparison with the parent stand....
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Báo cáo lâm nghiệp: "Mycorrhizal associations of nursery grown Scots pine (Pinus sylvestris L.) seedlings in Poland" ppt
... Högberg N. , Dahlberg A., Jonsson L., Nylund J E., Inter- and intraspecific variation in the ITS region of rDNA of ectomycor-rhizal fungi in Fennoscandia as detected by endonuclease analysis,New ... increase N and P concentrations of inocu-lated plants. Also performance and survival of the Pinus pineaseedlings outplanted in formerly arable land, is improved afterinoculation with Rhizopogon spp., ... com-position of even-aged seedlings growing in nurseries (likewise in settings where no mature trees are present) and under thecanopy of trees might be explained in terms of different lifehistory...
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Báo cáo lâm nghiệp: "Efficiency of early selection for rotation-aged wood quality traits in radiata pine" pdf
... Howell C., Plantations of Australia – A report from the National Plantation Inventory and theNational Farm Forest Inventory, National Forest Inventory, Bureau of Rural Science, Canberra, 2001.[48] ... rotation agefor MFA and MOE and at least 80% effective for wooddensity.5. Thinning of trials increased ring width and MFA, reducedring wood density and MOE of remaining trees in the firsttwo or ... selection was also conducted on retro-spective studies where the performance of young seedlings in controlled environments was related to the late performance of their siblings in plantations....
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