Báo cáo lâm nghiệp: "Responses of photosynthesis and stomatal conductance to atmospheric humidity in some mediterranean Abies specie" ppt
Báo cáo lâm nghiệp: "Responses of photosynthesis and stomatal conductance to atmospheric humidity in some mediterranean Abies specie" ppt
... induced by abscisic acid in leaves having different mesophyll anatomies.Plant Cell Physiol. 29, 385-394Responses of photosynthesis and stomatal conductance to atmospheric humidity ... diffusional and mesophyll photosynthetic processes in response to increasing Aw: Pinus pineaseedlings, having a leaf diffusional struc-(Cowan and Farquhar, 1977). In A. nord-manniana ... of a mesophyll effect in re-sponse to increasing Aw in some mediter-ranean Abies species. The study was alsoaimed at determining whether the differentspecies examined...
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Báo cáo lâm nghiệp: "Impact of drought and Hypoxylon mediterraneum on oak decline in the Mediterranean region" ppt
... the stem of declining trees,it is common to observe occlusion of xylemvessels and darkening of the surrondingparenchima (Vannini, 1990b; Vannini and Valentini, 1994).Oak ... located in a 40-year-old natural coppice of Q cerris, Q pubescens and Q frainetto, strongly affected by decline since1989, in the district of Gravina, in Puglia, in south-ern ... cerris L in central and southern Italy(Vannini and Scarascia Mugnozza, 1991;Vannini and Valentini, 1994).During the last decade, decline of oaksrepresented one of the most...
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Báo cáo lâm nghiệp: "Influence of fire and tree-fell on physiological parameters in Quercus ilex resprouts" potx
... not dif-ferent in control or either kind of resprout. The increased amount of carotenoids in resprouts contributed to providing protection from photoinhibitory processes.Quercus ... and leaf conductance to water vapor,were performed in situ in attached, fully expandedleaves of control plants and resprouts of burned and tree-felled stands using a portable ... to them, due to the removal of the shadingeffect (Hulbert, 1988), which increases thephotosynthetic capacity of resprouts (Knapp,1984). Enhancement of photosynthesis and leaf...
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Báo cáo lâm nghiệp: "Amounts of throughfall and lysimetric water in a sub-mountain beech forest in the Kremnické vrchy Mts" ppt
... collection and processing of throughfall water were carried out according to K (2002). At four-week intervals, we also took totals of gravitational water from the soil depths of 0.10 and 25 ... e in uence of the cutting intervention on the water regime of plots was found less pronounced mainly in 1989 – probably due to the absorption effect of the herbal synusia in the understorey ... aspects of this fact are reach-ing the top of the agenda. e potential reserves of “suitable” water are continually decreasing, mainly due to negative human activities. riftless exploi-tation of...
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Báo cáo lâm nghiệp: " Influence of temperatures and precipitation on radial increment of Orlické hory Mts. spruce stands at altitudes over 800 m a.s.l" ppt
... February and March of the year in question. e standard tree-ring chronology shows an obvious decrease in radial increments starting at the beginning of the 1970s and ending at the end of the 1980s. ... precipitation in the pre-vious year and by precipitation in that particular year. Precipitation in spring of the previous year and precipitation in winter, spring and summer of that particular ... sig-nificantly at the highest mountain altitudes (Č 2007). Mountain stands can be considerably damaged mainly during winter and at the beginning of spring as a result of ‘physiological drought’....
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Báo cáo lâm nghiệp: "Germination of acorns and development of oak seedlings (Quercus robur L.) following flooding" pot
... Der Rhein und seine Auen – eine Bilanz. Berlin, Springer Verlag.WELANDER N.T., OTTOSSON B., 1998. e in uence of shading on growth and morphology in seedlings of Quercus robur L. and Fagus ... duration of inundation increases.– Inundation during the vegetation period results in leaf abscission and necrosis of the shoot.– Mortality of seedlings increases as the duration of inundation increases.MATERIAL ... than to spring floods. K and P (1997) indicated that, in addition to age and species, the timing of the flood also in uences flood toler-ance. Seedlings are more tolerant to water...
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Báo cáo lâm nghiệp: "Density of juvenile and mature wood of selected coniferous species" pdf
... and layout of cells in the growing rings. e range of juvenile wood is usually defi ned using the number of rings. However, there is no unifi ed opinion concerning the number of rings of juvenile ... produced in compliance with valid norms for the de-termination of density. e samples were taken in the zone close to the central part of the stem (JW) and in the zones of external rings close to ... proportion of latewood. e diff erence between the ring widths of spruce JW and MW in our research was 2.05 mm. e ring width and the latewood proportion in u-Fig. 2. In uence of the late-wood...
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Báo cáo lâm nghiệp: "Evaluation of physiological and health state of Norway spruce plants with different growth rate at juvenile stage after outplanting at" pdf
... in size). One of the objectives was to investigate the in uence of specifi c sorting in a forest nursery on the growth and stability of out-plantings of Norway spruce mountain populations. ... strength, which may lead to a decrease in longevity.Diff erent criteria of the sorting of seedlings and plants should be used in the production of planting stock for higher mountainous locations because ... 2001): In uence of altitude of nursery, containerised technology and sorting intensity on performance of spruce (Picea abies [L.] Karsten) from high altitude seed sources after outplanting. In: ...
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Báo cáo lâm nghiệp: "Forest yield index and its applicability to the assessment of future forest yields" docx
... significant increase in radial increment of Norway spruce in Austria in the period of 1961 to 1990, during which the length of growing season increased by 11 days associated with the increase in mean ... of mixed stands was insufficient and why it was not proved to satisfaction if tree species grew better in mixed stands or in pure stands. Recent findings show that the volume of production of ... obtained for Scotch pine and European beech, which questions the rank-ing of Scotch pine among economic tree species, at least in the examined territory. e low accuracy of determination of...
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Báo cáo lâm nghiệp: "Comparison of morphological and physiological parameters of the planting material of Norway spruce (Picea abies [L.] Karst.) from intensive nursery technologies with current bareroot plants" ppt
... related to the daily and seasonal fluctuation of photosynthesis, plant growth and dynamics of stands (C et al. 1994).e values of Fo (minimum fluorescence at all re-action centres of photosystem ... values obtained by measurement of rapid changes in fluorescence after the illumination of needle samples adapted to darkness illustrate the state and integrity of photo-system II in chloroplasts. ... regen-eration. Intensive technologies for the production of containerized seedlings and plants are increasingly used in the present nursery practices.If all principles of these intensive greenhouse...
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