Báo cáo lâm nghiệp: "Dynamics of light interception, leaf area and biomass production in the establishment year in Populus clones" pot
Báo cáo lâm nghiệp: "Dynamics of light interception, leaf area and biomass production in the establishment year in Populus clones" pot
... the highest value occurring in clone 11-11 (0.8 g-MJ-1) and the lowest in 111-5 (0.4 g’MJ-1). ).Dynamics of light interception, leaf area and biomass production in ... produc-tion during the establishment year wassimilar to that of light interception and LAI; the average tree of hybrid clone 11-11 produced a total biomass of 1 kg of dryweight, ... parental clones.Even though their total leaf area indices at the end of the growing season were quitedifferent, their leaf areas on the main stem...
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Báo cáo lâm nghiệp: "Response of Douglas-fir leaf area index and litterfall dynamics to Swiss needle cast in north coastal Oregon, USA" ppt
... Factors in uencing the amount and distribution of leaf area of pine stands, Ecol. Bull. 43 (1994) 102–114.[63] Vose J.M., Swank W.T., Assessing the seasonal leaf area dynam-ics and vertical leaf area ... trees.2.2.2. Leaf area indexFoliage was sampled from the 10-30-y-old plantations prior tobudbreak in 2002 and in the fall of 2002, and from the 30-60-y-oldplantations in the winter of 2004. Before ... proportion of LAI at the start of the growingseason varied from 0.13 to 0.53 and declined with increasing initial LAI. SNC also shifted more of the annual foliage litterfall to earlier in the spring.Fine...
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Báo cáo lâm nghiệp: " Dynamics of tree species composition and characteristics of available space utilization in the natural forest of the National Nature Reserve Hrončokovský Grúň" pot
... were found in the processes of the formation and structure of dead wood. A significant increase in the necromass volume in the optimum stage, confirming the observations of S and S ... 497–508addition to the analysis of living trees, this procedure indirectly evaluates the variability of the dying-off of trees within individual developmental stages. In the advanced phase of the growth ... which together with beech starts to dominate in the lower and intermedi-ate layers, has a correlation index of R = 0.64, which is understandable concerning the behaviour of the virgin forest...
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Báo cáo lâm nghiệp: "Dynamics of natural regeneration of even-aged beech (Fagus sylvatica L.) stands at different shelterwood densities" pot
... since beech represents 99.2% of the canopy individuals in the plots of the study, regardless of the existence of patches of other species in the surroundings of the area. e total number of ... defined by the year of the seed production, which is one year before the germination of seedlings. In the first year of the study we distinguished only between 1 -year- old seedlings and older ... depth of humus in plot 2 is quite superior to the other plots perhaps because of the lack of slope and the high intensity of leaf fall com-ing from the canopy that, giving the deficit of light, ...
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Báo cáo lâm nghiệp: "Influence of light and competition on crown and shoot morphological parameters of Norway spruce and silver fir saplings" doc
... Hj the mean height of competing saplings in quadrant j, and Dj the mean distance between the competing saplings in quadrant j and the sample tree. In all the sapling, growth was assessed by the ... structuralfragmentation of the canopy and the clustering pattern of nat-ural regeneration [15] lead to a high spatial variability of light in the understory and of competition between saplings. An example of the ... by insect attack) variations in growth of the apical leader; in five years, on the other hand, light is likely to change even without natural or human-induced treefalling. The effect of sapling...
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Báo cáo lâm nghiệp: "Effects of light intensity on the growth and energy balance of photosystem II electron transport in Quercus alba " potx
... 5% of full sunlight (~ 58%), suggesting a priority in root growth unless light is severely limited. Leaf weight ratio, specific leaf area, and leaf area ratio increased with the degree of shading, ... been initiated underFL before the start of the experiment and, unlike seedlingsgrowing under FL and LS, only a small portion of the leavesactually initiated their growth after the start of the ... 48]).With increasing light intensity, photosynthesis rate increasedfrom HS to MS to LS to FL and thus more biomass was pro-duced by the same amount of leaf area. The rapid rise in LARwith decreasing...
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Báo cáo lâm nghiệp:" Dynamics of litterfall in a chronosequence of Douglas-fir (Pseudotsuga menziesii Franco) stands in the Beaujolais mounts (France)" potx
... estimating linear increment of litterfall from 0 to value observed in the 20- to 26 -year- old stand, then value for 26 -year- old stand wasused from 15 to 30 years, value observed in the 40- to 46 -year- old ... thank Erwin Ulrich, manager of the Renécofor network at ONF Fontainebleau, for providing unpublisheddata concerning the Douglas-fir sites of the network, and ChristineYoung for revising the English.482 ... is in favour of alkalinisation due toexcess cations in the living biomass [7]. Large amounts of cal-cium and magnesium are released at the soil surface, counter-acting the desaturation and the...
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Báo cáo lâm nghiệp: "Influence of light conditions on the predetermination of foliar characteristics in Betula alleghaniensis Britton" ppsx
... developed in fullsun. However, under each type of experi-mental condition during year n + 1, a clearinfluence of the light treatment of the pre-vious year (n,l was ... allowedcomparison of the percentages of tissuevolumes and air spaces in the leaf samples. In ec!rty leaves, palisade tissue and, to a greater extent, the volume of airspaces ... harvested in mid-August.Chlorophyll content The chlorophyll content of early leaveswas also influenced by the light conditions of year n (Fig. 1 For the 1 st harvest of early...
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Báo cáo lâm nghiệp: "Effect of stand segmentation on growth and development of Norway spruce stands" pps
... for trees growing in the first row (next to the track) in comparison with the group of trees from the second and the third row (11.1 and 8.8 m). On the other hand, the h/d ratio and height were ... slenderness quotient) in comparison with the treated stands (tending and tracks). It is obvious that the absence of thinning is the main reason causing the worse parameters in the control plot.– ... where the skid-ding track follows the direction of prevailing winds.– Stands without tending and without tracks had the worst parameters (the lowest diameter, height, the shortest crown and the...
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Báo cáo lâm nghiệp: "Evaluation of twenty-years-old pedunculate and sessile oak provenance tria" doc
... probably the main reason and in the case of fl oodplain wood-land the grain size of the sediments can also be con-sidered. Also the in uence of diff erent silvicultural treatments of plants in the ... found to be the slow-est growing. Mode 2 (crown in the upper third of the stem) entirely prevails for the type of branching. Only in the case of provenance 30 the majority of the stems were ... 167For the qualitative trait of the type of branching mode 2 (crown in the upper third of the stem) en-tirely prevails; only in the case of sessile oak prov-enance 20 mode 1 (continuous stem)...
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