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Báo cáo lâm nghiệp: "Occurrence of foliar nitrate reductase activity not induced by nitrate in symbiotic nitrogen-fed black alder (Alnus glutinosa)" ppt

Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Occurrence of foliar nitrate reductase activity not induced by nitrate in symbiotic nitrogen-fed black alder (Alnus glutinosa)" ppt

... NR activity: one group having low enzyme activity (plants 1-3) and one having high enzyme activity (plants 9-12).Occurrence of foliar nitrate reductase activity not induced ... leaf NR activity measured in vivo in alder might be of microbial origin.This hypothesis was tested by usingplants in axenic culture.Leaf NR activity of plants in axeniccultureThe ... ornon-nodulated alders grown with or with-out nitrate expressed notable NR activity (Table I). These findings indicate that theNR activity originates in leaf tissues, and not in microbial...
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Báo cáo lâm nghiệp: "Occurrence of Ips duplicatus (Coleoptera: Curculionidae, Scolytinae) on pines (Pinus sp.) in the Czech Republic and southern Poland – Short Communication" pdf

... detect-ed in various abundances on pines. Feeding outsets were found on the edge of pine branches; afterwards they were also found on living pine stems in different parishes where the pine predominated. ... densities. In the study area in the Czech Republic, spruces are declining because of drought and honey fungus attacks and 50–60% (n = 635) of them are consequently infested by I. duplicatus during ... remain not colonized at all (G 1997).e occurrence of I. duplicatus on pine was ob-served in a single locality of the eastern Czech Re-public, which is characterized by spruce dominance...
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Báo cáo lâm nghiệp: "Reduction of wood hygroscopicity and associated dimensional response by repeated humidity cycles" doc

... a greater spread of the values obtained, with the differentia-tion of Pinus Pinaster once again standing out.3.2. Swelling strainTables III and IV give the swelling strains in radial and tan-gential ... capa-ble of retaining the water molecules sorbed in molecular form,which are capable of linking to each other by means of hydro-gen bonds. This stage is exothermic, since it has been shownto diminish ... kind of ageing, has been studied from both points of view of moisture uptake and dimensional changes. Clearwood specimens from 3 gymnosperms (Pinus sylvestris L., Pinus pinaster Ait., Pinusinsignis...
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Báo cáo lâm nghiệp:"Mycorrhization of Pinus halepensis Mill. and Pinus pinaster Aiton seedlings in two commercial nurseries" ppsx

... study in two nurseries of SE Spain. Two types of inoculum (spore suspension and mycelium inoculum) were used on 3 700 pine seedlings. The aim of the study was to ascertain the influence of two ... number of seed-lings for each pine-inoculum combination. (2) Percentage of ectomy-corrhizas observed in each root system for each pine-inoculumcombination. These values were grouped into six ... forspore inoculum treatments of S. collinitus with P. halepensis in nursery A (figure 1) and for spore inoculum of S. mediter-ranensis with P. pinaster in nursery B (figure 2).Tab le I. Infection index...
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Báo cáo lâm nghiệp: " Effects of tree species on understory vegetation and environmental conditions in temperate forests." pps

... age was estimated by coring the base of a tree withan increment borer. Health of stands (indications of decline) and sil-vicultural management (uneven-aged stand or recent thinnings) wererecorded ... essence1. INTRODUCTIONThe development of human societies often has caused anoverexploitation of forests and a decrease in their area. In France, the minimum of forest cover coincided with theincrease ... of industrial activities during the 19th century [15].Threatened by wood shortages, some countries tried to increasetheir wood production by planting unforested areas and also by transforming...
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Báo cáo lâm nghiệp: "Delineation of seed zones for European beech (Fagus sylvatica L.) in the Czech Republic based on isozyme gene markers" ppsx

... a method of weighted averaging of the observed val-ues of a variable z within a neighbourhoodV containing n points. In case of ordinarykriging, i.e. when no long-range ... of 300 points, covering the territory of the CzechRepublic, employing kriging as an optimum spatial interpolation method. Cluster analysis basedon allelic profiles of ... detaileddescription of the principles of this methodtogether with the application to mappingthe gene frequencies in human popula-tions. In its simplest form, kriging is a method of weighted...
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Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Occurrence, biology and harmfulness of Galerucella lineola (F.) (Coleoptera, Chrysomelidae)" pps

... during 1,440 minutes) Males FemalesPeriod of feeding/period of breaks in feeding (min) 52/1,388 252/1,188(%) 3.6/96.4 17.5/82.5Number of feeding stages (= number of stages of break in feeding) ... 36Period of one stage of feeding (min) 3.5 7Period of one stage of break in feeding (min) 94 34Number of migrations from leaves to glass 69 16Ditto (during one stage of a break in feeding) 4.6 ... 1994. Wound -induced proteinase inhibitors in grey alder (Alnus incana): a defence mechanism against attacking insects. Oikos, 71: 239–245.SIPURA M., TAHVANAINEN J., 2000. Shading enhances...
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Báo cáo lâm nghiệp: "Nutrition of silver fir (Abies alba Mill) growing at the upper limit of its occurrence in the Šumava National Park and Protected Landscape Area" pot

... less afflicted by air pollution, has been exposed to emissions to a certain extent; this, in spite of the fact that this load is currently in the form of deposits and not in the form of a high ... especially in FTG 6B. In this rich, spruce-beech for-est site type in the 6th altitudinal vegetation zone, higher contents of magnesium, calcium, and zinc in needles were determined. e decline ... nearly 12%. During the period 2006–2007, in the Czech part of the Bohemian Forest, samples of silver fir were taken mainly in the upper alti-tudinal limit of silver fir occurrence. In the present...
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Báo cáo lâm nghiệp: "Influence of flooding on growth, nitrogen availability in soil, and nitrate reduction of young oak seedlings (Quercus robur L.)" docx

... decrease in cytokininsynthesis resulting from a reduction in root tip biomass in flooded seedlings. In fact, Dickson [10] underlined the involve-ment of cytokinin in bud break initiation of Quercus ... the ability of flooded seedlings to maintain nitrate reductase activity in roots despite low nitrate content in soil. In some species, nitrate reductase activity of the root was evenincreased ... seedlings could be due to adecrease in nitrate import from root. Nitrate induces activationand induction of nitrate reductase. Thus, the observed decrease of nitrate reductase activity in leaves...
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Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Influence of light conditions on the predetermination of foliar characteristics in Betula alleghaniensis Britton" ppsx

... proportion of air spaces was alsoobserved in late leaf samples harvested in early July on seedlings of treatments 2and 4, but these differences were not observed in leaves ... harvested in mid-August.Chlorophyll contentThe chlorophyll content of early leaveswas also influenced by the light conditions of year n (Fig. 1 For the 1 st harvest of early ... when expressed on the basis of dryweight, were found in leaves harvested onseedlings of treatments 2 and 4. Dif-ferences were less noticeable in earlyleaves harvested later,...
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