Báo cáo lâm nghiệp: "Physiological responses to air pollutants" potx
Báo cáo lâm nghiệp: "Physiological responses to air pollutants" potx
... with air pollutants. According to Levitt (1980),two strategies can be distinguished: avoid-ance and tolerance. While avoidance stra-tegies include the cuticle and the stomata,tolerance ... lead to re-latively severe damage to trees, especiallyunder unfavorable weather conditions andshortening of the vegetation period.The stomata can play a role similar to the ... sulfhydril-system of plants. Phytopathol. Z.104, 264-271Hiligren J.E. (1984) Photosynthetic gas ex-change in leaves affected by air pollutants. In:Gaseous Air Pollutants and Plant...
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Báo cáo lâm nghiệp: "Physiological responses to" potx
... enzymes in photosyntheticcarbon reduction cycle and/or a restrictionof photophosphorylation. The irreversibleeffect is thought to be due to an injury to the thylakoid ... originallocation to new areas.Low summer temperature has beensuggested to be a limiting factor for distri-bution of several vascular plants in Scan-dinavia, primarily due to the ... tolerance of potato(Solanum sp.). Plant Physiol. 70, 1299-1302Vertucci C.W., Stushnoff C. & Towill L.E. (1988)The loss of &dquo;vital&dquo; water contributes to...
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Báo cáo lâm nghiệp: "Physiological and morphological responses of dormant and growing Norway spruce container seedlings to drought after planting" docx
... from –0.96 MPa to –2.22 MPa, indicatingprobably down-regulation of primary photochemistry and theaugmentation of photoprotective mechanisms to avoid overre-duction and photoinhibitory damage ... [10, 22]. Since the frozen storage of spring plantedseedlings is usually initiated in October, prolongation wouldaccount for a storage period of over 30 weeks. Long storageperiods may, however, ... exposed to water stress after planting[12, 16, 17]. In addition, dormant seedlings initiating newgrowth after planting allocate preferentially more photosynt-hates to shoot growth compared to root...
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Báo cáo lâm nghiệp: "Physiological, morphological and growth responses to rhizosphere hypoxia by seedlings of North American bottomland oaks" potx
... significant decline in net photo-synthesis was observed concomitant to reduced stomatal aperture. However, non-stomatal limitations to photosynthesis mayalso be observed ... other seedling responses inflood-tolerant Alnus japonica and flood-intolerantBetula platyphylla var japonica. Tree Physiol 14,251-261Topa MA, McLeod KW (1986) Responses of ... (1984) Photosynthetic andgrowth responses of silver maple (Acer saccharinumL) seedlings to flooding. Am Midl Nat 112, 261-272Pezeshki SR (1991) Root responses of flood-tolerantand...
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Báo cáo lâm nghiệp: "Ecophysiological responses of Mediterranean pines to simulated sea aerosol polluted with an anionic surfactant: prospects for biomonitoring" pptx
... for use in biomonitoring.Stomatal structural damage, used as an indicator of atmosphe-ric pollution [50], was also proved to be sensitive to surfactants.The symptomatology of stomatal damage ... Selective solu-bilization of tomato fruit epicuticular wax constituents by Triton X-100 surfactant, J. Pest. Sci. 26 (2001) 16–20.[48] Townsend A.M., The search for salt tolerant trees, Arboric. ... Spraying was per-formed with an air compressor connected to a spray-gun; air pressureat outlet was 4 atm. Spray flux was regulated so as to obtain dropsmeasuring 70 to 150 µm in diameter. Spraying...
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Báo cáo lâm nghiệp: " Game damage to forest trees" ppsx
... large predators produces changes in food chains. In forest stands influenced by human activities the reasonable game management and the regulation of game stock seems to be one of the main tools ... standard stock. e number of wildlife ruminants has to be equalized with food sources in the area.– Feed racks placed close to young forest stands consequently increase damage to nearby forest ... can be used for the deter-mination of damage originators are marks such as trails, lairs and droppings. Determination of brows-ing originators becomes more difficult with elapsed time. e exact...
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Báo cáo lâm nghiệp: " A contribution to the properties of combined plywood materials" ppsx
... were cut to determine bending strength (6 specimens in longitudinal direction, 6 in cross direction), 6 to determine density, 6 to determine moisture and in Variant 2, 6 specimens to determine ... from 13.02 kg/m2 to 14.41 kg/m2.CONCLUSIONe aim of the paper was to determine properties of newly developed plywood materials combined with cork and fibreglass and to compare them with ... using a laboratory press 700 × 700 mm in size, sampling was carried out ac-cording to the ČSN EN 326 –1 standard.Determination of modulus of elasticity and bending strength according to ČSN EN...
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Báo cáo lâm nghiệp: "A contribution to the resistance of combined plywood materials to abrasion" potx
... calibration. e disks are placed into the apparatus and the revolution counter is set to zero. e first test specimen is fixed into the holder. It is necessary to ensure that the test specimen ... side has to be worked in parallel with the specimen level (Fig. 2). e speci-men height has to correspond to requirements of a testing machine. If the testing machine does not allow to change ... Defects found are recorded into a protocol. Before the actual test, samples are acclimatized for 72 hours at least in the environment with air temper-ature 23 ± 2°C and air relative humidity 50...
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Báo cáo lâm nghiệp: "Growth response to thinning in Quercus pyrenaica Willd. coppice stands in Spanish central mountain" doc
... inventory dates.Growth response of Q. pyrenaica to thinning 247 by diameter classes, due to the lack of height growth response to thinning. Although the same sample of trees was used to measure ... the first inventory (30-years-old) the basal area and biomass removed with thinning are added to standing values to calculatethe total crop of the stand. In the other two inventories the natural ... pyrenaica to thinning 245The results of Ducan’s test also explain the aforementioneddifferent responses to thinning intensities in the two growthintervals (Tab. II). This fact seems to indicate...
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Báo cáo lâm nghiệp: "Insect damage to cones and other mortality factors limiting natural regeneration potential of Swiss stone pine (Pinus cembra L) in the northern French Alps" doc
... alcohol or raised to the adult stage.RESULTSCone entomofauna of Swiss stone pineThree phytophagous species were observed to attack the seed cones of Swiss stonepine. The ... abiotic factors during the first year of cone developmentwhile cone insects caused most damage to second-year cones. The cone entomofauna only includedthree phytophagous ... and Swissstone pine may also influence the develop-ment of forests where the two species aremixed. The higher damage to larch seedscould be speculated to result in...
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